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com.amazonaws.services.dynamodbv2.model.DeleteItemRequest Maven / Gradle / Ivy

/*
 * Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 * 
 *  http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.services.dynamodbv2.model;

import java.io.Serializable;

import com.amazonaws.AmazonWebServiceRequest;

/**
 * Container for the parameters to the {@link com.amazonaws.services.dynamodbv2.AmazonDynamoDB#deleteItem(DeleteItemRequest) DeleteItem operation}.
 * 

 * Deletes a single item in a table by primary key. You can perform a
 * conditional delete operation that deletes the item if it exists, or if
 * it has an expected attribute value.
 * 
 * 

 * In addition to deleting an item, you can also return the item's
 * attribute values in the same operation, using the ReturnValues
 * parameter.
 * 
 * 

 * Unless you specify conditions, the DeleteItem is an idempotent
 * operation; running it multiple times on the same item or attribute
 * does not result in an error response.
 * 
 * 

 * Conditional deletes are useful for deleting items only if specific
 * conditions are met. If those conditions are met, DynamoDB performs the
 * delete. Otherwise, the item is not deleted.
 * 
 *
 * @see com.amazonaws.services.dynamodbv2.AmazonDynamoDB#deleteItem(DeleteItemRequest)
 */
public class DeleteItemRequest extends AmazonWebServiceRequest implements Serializable, Cloneable {

    /**
     * The name of the table from which to delete the item.
     * 

     * Constraints:

     * Length: 3 - 255

     * Pattern: [a-zA-Z0-9_.-]+

     */
    private String tableName;

    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     */
    private java.util.Map key;

    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A map of attribute/condition pairs.
     * Expected provides a conditional block for the DeleteItem
     * operation. 
Each element of Expected consists of an attribute
     * name, a comparison operator, and one or more values. DynamoDB compares
     * the attribute with the value(s) you supplied, using the comparison
     * operator. For each Expected element, the result of the
     * evaluation is either true or false. 
If you specify more than one
     * element in the Expected map, then by default all of the
     * conditions must evaluate to true. In other words, the conditions are
     * ANDed together. (You can use the ConditionalOperator parameter
     * to OR the conditions instead. If you do this, then at least one of the
     * conditions must evaluate to true, rather than all of them.) 
If the
     * Expected map evaluates to true, then the conditional operation
     * succeeds; otherwise, it fails. 
Expected contains the
     * following: 
 
 
AttributeValueList - One or more values
     * to evaluate against the supplied attribute. The number of values in
     * the list depends on the ComparisonOperator being used. 
For
     * type Number, value comparisons are numeric. 
String value
     * comparisons for greater than, equals, or less than are based on ASCII
     * character code values. For example, a is greater than
     * A, and a is greater than B. For
     * a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     * 
For type Binary, DynamoDB treats each byte of the binary data as
     * unsigned when it compares binary values. 
 

     * 
ComparisonOperator - A comparator for evaluating attributes
     * in the AttributeValueList. When performing the comparison,
     * DynamoDB uses strongly consistent reads. 
The following comparison
     * operators are available: 
EQ | NE | LE | LT | GE | GT |
     * NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     * BETWEEN 
The following are descriptions of each comparison
     * operator. 
 
 
EQ : Equal. EQ is
     * supported for all datatypes, including lists and maps.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, Binary, String
     * Set, Number Set, or Binary Set. If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not equal {"NS":["6", "2",
     * "1"]}. 
 
 
 
NE : Not equal.
     * NE is supported for all datatypes, including lists and
     * maps. 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, Binary, String Set,
     * Number Set, or Binary Set. If an item contains an
     * AttributeValue of a different type than the one provided in the
     * request, the value does not match. For example, {"S":"6"}
     * does not equal {"N":"6"}. Also, {"N":"6"}
     * does not equal {"NS":["6", "2", "1"]}. 
 
 

     * 
LE : Less than or equal. 
AttributeValueList
     * can contain only one AttributeValue element of type String,
     * Number, or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
LT : Less than.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, or Binary (not a set
     * type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GE : Greater than or equal.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GT : Greater than. 
AttributeValueList can
     * contain only one AttributeValue element of type String, Number,
     * or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
NOT_NULL : The attribute
     * exists. NOT_NULL is supported for all datatypes,
     * including lists and maps. 
This operator tests for the
     * existence of an attribute, not its data type. If the data type of
     * attribute "a" is null, and you evaluate it using
     * NOT_NULL, the result is a Boolean true. This
     * result is because the attribute "a" exists; its data type
     * is not relevant to the NOT_NULL comparison operator.
     *  
 
 
NULL : The attribute does not
     * exist. NULL is supported for all datatypes, including
     * lists and maps. 
This operator tests for the nonexistence of
     * an attribute, not its data type. If the data type of attribute
     * "a" is null, and you evaluate it using NULL,
     * the result is a Boolean false. This is because the attribute
     * "a" exists; its data type is not relevant to the
     * NULL comparison operator.  
 

     * 
CONTAINS : Checks for a subsequence, or value in a
     * set. 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If the target attribute of the comparison is of type
     * String, then the operator checks for a substring match. If the target
     * attribute of the comparison is of type Binary, then the operator looks
     * for a subsequence of the target that matches the input. If the target
     * attribute of the comparison is a set ("SS",
     * "NS", or "BS"), then the operator evaluates
     * to true if it finds an exact match with any member of the set.
     * 
CONTAINS is supported for lists: When evaluating "a CONTAINS
     * b", "a" can be a list; however, "b"
     * cannot be a set, a map, or a list. 
 

     * 
NOT_CONTAINS : Checks for absence of a subsequence, or
     * absence of a value in a set. 
AttributeValueList can contain
     * only one AttributeValue element of type String, Number, or
     * Binary (not a set type). If the target attribute of the comparison is
     * a String, then the operator checks for the absence of a substring
     * match. If the target attribute of the comparison is Binary, then the
     * operator checks for the absence of a subsequence of the target that
     * matches the input. If the target attribute of the comparison is a set
     * ("SS", "NS", or "BS"), then the
     * operator evaluates to true if it does not find an exact match
     * with any member of the set. 
NOT_CONTAINS is supported for lists:
     * When evaluating "a NOT CONTAINS b", "a" can
     * be a list; however, "b" cannot be a set, a map, or a
     * list. 
 
 
BEGINS_WITH : Checks for a prefix.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String or Binary (not a Number or a set
     * type). The target attribute of the comparison must be of type String
     * or Binary (not a Number or a set type). 
 
 

     * 
IN : Checks for matching elements within two sets.
     * 
AttributeValueList can contain one or more
     * AttributeValue elements of type String, Number, or Binary (not
     * a set type). These attributes are compared against an existing set
     * type attribute of an item. If any elements of the input set are
     * present in the item attribute, the expression evaluates to true. 
     * 
 
BETWEEN : Greater than or equal to the first
     * value, and less than or equal to the second value.
     * 
AttributeValueList must contain two AttributeValue
     * elements of the same type, either String, Number, or Binary (not a set
     * type). A target attribute matches if the target value is greater than,
     * or equal to, the first element and less than, or equal to, the second
     * element. If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not compare to
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     * usage examples of AttributeValueList and
     * ComparisonOperator, see Legacy
     * Conditional Parameters in the Amazon DynamoDB Developer
     * Guide. 
For backward compatibility with previous DynamoDB
     * releases, the following parameters can be used instead of
     * AttributeValueList and ComparisonOperator: 
 

     * 
Value - A value for DynamoDB to compare with an attribute.
     * 
 
 
Exists - A Boolean value that causes DynamoDB to
     * evaluate the value before attempting the conditional operation: 

     * 
 
If Exists is true, DynamoDB will check to
     * see if that attribute value already exists in the table. If it is
     * found, then the condition evaluates to true; otherwise the condition
     * evaluate to false. 
 
If Exists is
     * false, DynamoDB assumes that the attribute value does
     * not exist in the table. If in fact the value does not exist,
     * then the assumption is valid and the condition evaluates to true. If
     * the value is found, despite the assumption that it does not exist, the
     * condition evaluates to false.
 
 
Note that the default
     * value for Exists is true. 
 
 
The
     * Value and Exists parameters are incompatible with
     * AttributeValueList and ComparisonOperator. Note that if
     * you use both sets of parameters at once, DynamoDB will return a
     * ValidationException exception. 
This parameter does not
     * support attributes of type List or Map.
     */
    private java.util.Map expected;

    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     */
    private String conditionalOperator;

    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     */
    private String returnValues;

    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     */
    private String returnConsumedCapacity;

    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     */
    private String returnItemCollectionMetrics;

    /**
     * A condition that must be satisfied in order for a conditional
     * DeleteItem to succeed. 
An expression can contain any of the
     * following: 
 
 
Functions: attribute_exists |
     * attribute_not_exists | attribute_type | contains | begins_with |
     * size 
These function names are case-sensitive. 
 

     * 
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     * IN 
 
 
 Logical operators: AND | OR |
     * NOT 
 
 
For more information on condition
     * expressions, see Specifying
     * Conditions in the Amazon DynamoDB Developer Guide.
     * 
ConditionExpression replaces the legacy
     * ConditionalOperator and Expected parameters.
     */
    private String conditionExpression;

    /**
     * One or more substitution tokens for attribute names in an expression.
     * The following are some use cases for using
     * ExpressionAttributeNames: 
 
 
To access an attribute
     * whose name conflicts with a DynamoDB reserved word. 
 
 
To
     * create a placeholder for repeating occurrences of an attribute name in
     * an expression. 
 
 
To prevent special characters in an
     * attribute name from being misinterpreted in an expression. 
 
     * 
Use the # character in an expression to dereference an
     * attribute name. For example, consider the following attribute name:
     * 
Percentile
 
The name of this
     * attribute conflicts with a reserved word, so it cannot be used
     * directly in an expression. (For the complete list of reserved words,
     * see Reserved
     * Words in the Amazon DynamoDB Developer Guide). To work
     * around this, you could specify the following for
     * ExpressionAttributeNames:
     * 
{"#P":"Percentile"}
 
You could
     * then use this substitution in an expression, as in this example:
     * 
#P = :val
 
Tokens that begin
     * with the : character are expression attribute values,
     * which are placeholders for the actual value at runtime. 
For
     * more information on expression attribute names, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     */
    private java.util.Map expressionAttributeNames;

    /**
     * One or more values that can be substituted in an expression. 
Use
     * the : (colon) character in an expression to dereference an
     * attribute value. For example, suppose that you wanted to check whether
     * the value of the ProductStatus attribute was one of the
     * following: 
Available | Backordered | Discontinued
     * 
You would first need to specify ExpressionAttributeValues as
     * follows: 
{ ":avail":{"S":"Available"},
     * ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     * 
You could then use these values in an expression, such as this:
     * 
ProductStatus IN (:avail, :back, :disc) 
For more
     * information on expression attribute values, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     */
    private java.util.Map expressionAttributeValues;

    /**
     * Default constructor for a new DeleteItemRequest object.  Callers should use the
     * setter or fluent setter (with...) methods to initialize this object after creating it.
     */
    public DeleteItemRequest() {}
    
    /**
     * Constructs a new DeleteItemRequest object.
     * Callers should use the setter or fluent setter (with...) methods to
     * initialize any additional object members.
     * 
     * @param tableName The name of the table from which to delete the item.
     * @param key A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     */
    public DeleteItemRequest(String tableName, java.util.Map key) {
        setTableName(tableName);
        setKey(key);
    }

    /**
     * Constructs a new DeleteItemRequest object.
     * Callers should use the setter or fluent setter (with...) methods to
     * initialize any additional object members.
     * 
     * @param tableName The name of the table from which to delete the item.
     * @param key A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * @param returnValues Use ReturnValues if you want to get the
     * item attributes as they appeared before they were deleted. For
     * DeleteItem, the valid values are: 
 

     * 
NONE - If ReturnValues is not specified, or if
     * its value is NONE, then nothing is returned. (This
     * setting is the default for ReturnValues.) 
 

     * 
ALL_OLD - The content of the old item is returned.
     * 
 
     */
    public DeleteItemRequest(String tableName, java.util.Map key, String returnValues) {
        setTableName(tableName);
        setKey(key);
        setReturnValues(returnValues);
    }

    /**
     * Constructs a new DeleteItemRequest object.
     * Callers should use the setter or fluent setter (with...) methods to
     * initialize any additional object members.
     * 
     * @param tableName The name of the table from which to delete the item.
     * @param key A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * @param returnValues Use ReturnValues if you want to get the
     * item attributes as they appeared before they were deleted. For
     * DeleteItem, the valid values are: 
 

     * 
NONE - If ReturnValues is not specified, or if
     * its value is NONE, then nothing is returned. (This
     * setting is the default for ReturnValues.) 
 

     * 
ALL_OLD - The content of the old item is returned.
     * 
 
     */
    public DeleteItemRequest(String tableName, java.util.Map key, ReturnValue returnValues) {
        this.tableName = tableName;
        this.key = key;
        this.returnValues = returnValues.toString();
    }

    /**
     * The name of the table from which to delete the item.
     * 

     * Constraints:

     * Length: 3 - 255

     * Pattern: [a-zA-Z0-9_.-]+

     *
     * @return The name of the table from which to delete the item.
     */
    public String getTableName() {
        return tableName;
    }
    
    /**
     * The name of the table from which to delete the item.
     * 

     * Constraints:

     * Length: 3 - 255

     * Pattern: [a-zA-Z0-9_.-]+

     *
     * @param tableName The name of the table from which to delete the item.
     */
    public void setTableName(String tableName) {
        this.tableName = tableName;
    }
    
    /**
     * The name of the table from which to delete the item.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Length: 3 - 255

     * Pattern: [a-zA-Z0-9_.-]+

     *
     * @param tableName The name of the table from which to delete the item.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withTableName(String tableName) {
        this.tableName = tableName;
        return this;
    }

    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     *
     * @return A map of attribute names to AttributeValue objects,
     *         representing the primary key of the item to delete. 
For the primary
     *         key, you must provide all of the attributes. For example, with a hash
     *         type primary key, you only need to provide the hash attribute. For a
     *         hash-and-range type primary key, you must provide both the hash
     *         attribute and the range attribute.
     */
    public java.util.Map getKey() {
        
        return key;
    }
    
    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     *
     * @param key A map of attribute names to AttributeValue objects,
     *         representing the primary key of the item to delete. 
For the primary
     *         key, you must provide all of the attributes. For example, with a hash
     *         type primary key, you only need to provide the hash attribute. For a
     *         hash-and-range type primary key, you must provide both the hash
     *         attribute and the range attribute.
     */
    public void setKey(java.util.Map key) {
        this.key = key;
    }
    
    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param key A map of attribute names to AttributeValue objects,
     *         representing the primary key of the item to delete. 
For the primary
     *         key, you must provide all of the attributes. For example, with a hash
     *         type primary key, you only need to provide the hash attribute. For a
     *         hash-and-range type primary key, you must provide both the hash
     *         attribute and the range attribute.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withKey(java.util.Map key) {
        setKey(key);
        return this;
    }

    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * 

     * This method accepts the hashKey, rangeKey of Key as
     * java.util.Map.Entry objects.
     *
     * @param hashKey Primary hash key.
     * @param rangeKey Primary range key. (null if it a hash-only table)
     */
    public void setKey(java.util.Map.Entry hashKey, java.util.Map.Entry rangeKey) throws IllegalArgumentException {
        java.util.HashMap key = new java.util.HashMap();
      
      if (hashKey != null) {
          key.put(hashKey.getKey(), hashKey.getValue());
      } else
            throw new IllegalArgumentException("hashKey must be non-null object.");
      if (rangeKey != null) {
          key.put(rangeKey.getKey(), rangeKey.getValue());
      } 
        setKey(key);
    }
    
    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * 

     * This method accepts the hashKey, rangeKey of Key as
     * java.util.Map.Entry objects.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param hashKey Primary hash key.
     * @param rangeKey Primary range key. (null if it a hash-only table)
     */
    public DeleteItemRequest withKey(java.util.Map.Entry hashKey, java.util.Map.Entry rangeKey) throws IllegalArgumentException {
      setKey(hashKey, rangeKey);
      return this;
    }

    /**
     * A map of attribute names to AttributeValue objects,
     * representing the primary key of the item to delete. 
For the primary
     * key, you must provide all of the attributes. For example, with a hash
     * type primary key, you only need to provide the hash attribute. For a
     * hash-and-range type primary key, you must provide both the hash
     * attribute and the range attribute.
     * 

     * The method adds a new key-value pair into Key parameter, and returns a
     * reference to this object so that method calls can be chained together.
     *
     * @param key The key of the entry to be added into Key.
     * @param value The corresponding value of the entry to be added into Key.
     */
  public DeleteItemRequest addKeyEntry(String key, AttributeValue value) {
    if (null == this.key) {
      this.key = new java.util.HashMap();
    }
    if (this.key.containsKey(key))
      throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
    this.key.put(key, value);
    return this;
  }

  /**
   * Removes all the entries added into Key.
   * 

   * Returns a reference to this object so that method calls can be chained together.
   */
  public DeleteItemRequest clearKeyEntries() {
    this.key = null;
    return this;
  }
  
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A map of attribute/condition pairs.
     * Expected provides a conditional block for the DeleteItem
     * operation. 
Each element of Expected consists of an attribute
     * name, a comparison operator, and one or more values. DynamoDB compares
     * the attribute with the value(s) you supplied, using the comparison
     * operator. For each Expected element, the result of the
     * evaluation is either true or false. 
If you specify more than one
     * element in the Expected map, then by default all of the
     * conditions must evaluate to true. In other words, the conditions are
     * ANDed together. (You can use the ConditionalOperator parameter
     * to OR the conditions instead. If you do this, then at least one of the
     * conditions must evaluate to true, rather than all of them.) 
If the
     * Expected map evaluates to true, then the conditional operation
     * succeeds; otherwise, it fails. 
Expected contains the
     * following: 
 
 
AttributeValueList - One or more values
     * to evaluate against the supplied attribute. The number of values in
     * the list depends on the ComparisonOperator being used. 
For
     * type Number, value comparisons are numeric. 
String value
     * comparisons for greater than, equals, or less than are based on ASCII
     * character code values. For example, a is greater than
     * A, and a is greater than B. For
     * a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     * 
For type Binary, DynamoDB treats each byte of the binary data as
     * unsigned when it compares binary values. 
 

     * 
ComparisonOperator - A comparator for evaluating attributes
     * in the AttributeValueList. When performing the comparison,
     * DynamoDB uses strongly consistent reads. 
The following comparison
     * operators are available: 
EQ | NE | LE | LT | GE | GT |
     * NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     * BETWEEN 
The following are descriptions of each comparison
     * operator. 
 
 
EQ : Equal. EQ is
     * supported for all datatypes, including lists and maps.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, Binary, String
     * Set, Number Set, or Binary Set. If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not equal {"NS":["6", "2",
     * "1"]}. 
 
 
 
NE : Not equal.
     * NE is supported for all datatypes, including lists and
     * maps. 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, Binary, String Set,
     * Number Set, or Binary Set. If an item contains an
     * AttributeValue of a different type than the one provided in the
     * request, the value does not match. For example, {"S":"6"}
     * does not equal {"N":"6"}. Also, {"N":"6"}
     * does not equal {"NS":["6", "2", "1"]}. 
 
 

     * 
LE : Less than or equal. 
AttributeValueList
     * can contain only one AttributeValue element of type String,
     * Number, or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
LT : Less than.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, or Binary (not a set
     * type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GE : Greater than or equal.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GT : Greater than. 
AttributeValueList can
     * contain only one AttributeValue element of type String, Number,
     * or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
NOT_NULL : The attribute
     * exists. NOT_NULL is supported for all datatypes,
     * including lists and maps. 
This operator tests for the
     * existence of an attribute, not its data type. If the data type of
     * attribute "a" is null, and you evaluate it using
     * NOT_NULL, the result is a Boolean true. This
     * result is because the attribute "a" exists; its data type
     * is not relevant to the NOT_NULL comparison operator.
     *  
 
 
NULL : The attribute does not
     * exist. NULL is supported for all datatypes, including
     * lists and maps. 
This operator tests for the nonexistence of
     * an attribute, not its data type. If the data type of attribute
     * "a" is null, and you evaluate it using NULL,
     * the result is a Boolean false. This is because the attribute
     * "a" exists; its data type is not relevant to the
     * NULL comparison operator.  
 

     * 
CONTAINS : Checks for a subsequence, or value in a
     * set. 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If the target attribute of the comparison is of type
     * String, then the operator checks for a substring match. If the target
     * attribute of the comparison is of type Binary, then the operator looks
     * for a subsequence of the target that matches the input. If the target
     * attribute of the comparison is a set ("SS",
     * "NS", or "BS"), then the operator evaluates
     * to true if it finds an exact match with any member of the set.
     * 
CONTAINS is supported for lists: When evaluating "a CONTAINS
     * b", "a" can be a list; however, "b"
     * cannot be a set, a map, or a list. 
 

     * 
NOT_CONTAINS : Checks for absence of a subsequence, or
     * absence of a value in a set. 
AttributeValueList can contain
     * only one AttributeValue element of type String, Number, or
     * Binary (not a set type). If the target attribute of the comparison is
     * a String, then the operator checks for the absence of a substring
     * match. If the target attribute of the comparison is Binary, then the
     * operator checks for the absence of a subsequence of the target that
     * matches the input. If the target attribute of the comparison is a set
     * ("SS", "NS", or "BS"), then the
     * operator evaluates to true if it does not find an exact match
     * with any member of the set. 
NOT_CONTAINS is supported for lists:
     * When evaluating "a NOT CONTAINS b", "a" can
     * be a list; however, "b" cannot be a set, a map, or a
     * list. 
 
 
BEGINS_WITH : Checks for a prefix.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String or Binary (not a Number or a set
     * type). The target attribute of the comparison must be of type String
     * or Binary (not a Number or a set type). 
 
 

     * 
IN : Checks for matching elements within two sets.
     * 
AttributeValueList can contain one or more
     * AttributeValue elements of type String, Number, or Binary (not
     * a set type). These attributes are compared against an existing set
     * type attribute of an item. If any elements of the input set are
     * present in the item attribute, the expression evaluates to true. 
     * 
 
BETWEEN : Greater than or equal to the first
     * value, and less than or equal to the second value.
     * 
AttributeValueList must contain two AttributeValue
     * elements of the same type, either String, Number, or Binary (not a set
     * type). A target attribute matches if the target value is greater than,
     * or equal to, the first element and less than, or equal to, the second
     * element. If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not compare to
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     * usage examples of AttributeValueList and
     * ComparisonOperator, see Legacy
     * Conditional Parameters in the Amazon DynamoDB Developer
     * Guide. 
For backward compatibility with previous DynamoDB
     * releases, the following parameters can be used instead of
     * AttributeValueList and ComparisonOperator: 
 

     * 
Value - A value for DynamoDB to compare with an attribute.
     * 
 
 
Exists - A Boolean value that causes DynamoDB to
     * evaluate the value before attempting the conditional operation: 

     * 
 
If Exists is true, DynamoDB will check to
     * see if that attribute value already exists in the table. If it is
     * found, then the condition evaluates to true; otherwise the condition
     * evaluate to false. 
 
If Exists is
     * false, DynamoDB assumes that the attribute value does
     * not exist in the table. If in fact the value does not exist,
     * then the assumption is valid and the condition evaluates to true. If
     * the value is found, despite the assumption that it does not exist, the
     * condition evaluates to false.
 
 
Note that the default
     * value for Exists is true. 
 
 
The
     * Value and Exists parameters are incompatible with
     * AttributeValueList and ComparisonOperator. Note that if
     * you use both sets of parameters at once, DynamoDB will return a
     * ValidationException exception. 
This parameter does not
     * support attributes of type List or Map.
     *
     * @return  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A map of attribute/condition pairs.
     *         Expected provides a conditional block for the DeleteItem
     *         operation. 
Each element of Expected consists of an attribute
     *         name, a comparison operator, and one or more values. DynamoDB compares
     *         the attribute with the value(s) you supplied, using the comparison
     *         operator. For each Expected element, the result of the
     *         evaluation is either true or false. 
If you specify more than one
     *         element in the Expected map, then by default all of the
     *         conditions must evaluate to true. In other words, the conditions are
     *         ANDed together. (You can use the ConditionalOperator parameter
     *         to OR the conditions instead. If you do this, then at least one of the
     *         conditions must evaluate to true, rather than all of them.) 
If the
     *         Expected map evaluates to true, then the conditional operation
     *         succeeds; otherwise, it fails. 
Expected contains the
     *         following: 
 
 
AttributeValueList - One or more values
     *         to evaluate against the supplied attribute. The number of values in
     *         the list depends on the ComparisonOperator being used. 
For
     *         type Number, value comparisons are numeric. 
String value
     *         comparisons for greater than, equals, or less than are based on ASCII
     *         character code values. For example, a is greater than
     *         A, and a is greater than B. For
     *         a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     *         
For type Binary, DynamoDB treats each byte of the binary data as
     *         unsigned when it compares binary values. 
 

     *         
ComparisonOperator - A comparator for evaluating attributes
     *         in the AttributeValueList. When performing the comparison,
     *         DynamoDB uses strongly consistent reads. 
The following comparison
     *         operators are available: 
EQ | NE | LE | LT | GE | GT |
     *         NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     *         BETWEEN 
The following are descriptions of each comparison
     *         operator. 
 
 
EQ : Equal. EQ is
     *         supported for all datatypes, including lists and maps.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, Binary, String
     *         Set, Number Set, or Binary Set. If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not equal {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NE : Not equal.
     *         NE is supported for all datatypes, including lists and
     *         maps. 
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, Binary, String Set,
     *         Number Set, or Binary Set. If an item contains an
     *         AttributeValue of a different type than the one provided in the
     *         request, the value does not match. For example, {"S":"6"}
     *         does not equal {"N":"6"}. Also, {"N":"6"}
     *         does not equal {"NS":["6", "2", "1"]}. 
 
 

     *         
LE : Less than or equal. 
AttributeValueList
     *         can contain only one AttributeValue element of type String,
     *         Number, or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
LT : Less than.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, or Binary (not a set
     *         type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GE : Greater than or equal.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GT : Greater than. 
AttributeValueList can
     *         contain only one AttributeValue element of type String, Number,
     *         or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NOT_NULL : The attribute
     *         exists. NOT_NULL is supported for all datatypes,
     *         including lists and maps. 
This operator tests for the
     *         existence of an attribute, not its data type. If the data type of
     *         attribute "a" is null, and you evaluate it using
     *         NOT_NULL, the result is a Boolean true. This
     *         result is because the attribute "a" exists; its data type
     *         is not relevant to the NOT_NULL comparison operator.
     *          
 
 
NULL : The attribute does not
     *         exist. NULL is supported for all datatypes, including
     *         lists and maps. 
This operator tests for the nonexistence of
     *         an attribute, not its data type. If the data type of attribute
     *         "a" is null, and you evaluate it using NULL,
     *         the result is a Boolean false. This is because the attribute
     *         "a" exists; its data type is not relevant to the
     *         NULL comparison operator.  
 

     *         
CONTAINS : Checks for a subsequence, or value in a
     *         set. 
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If the target attribute of the comparison is of type
     *         String, then the operator checks for a substring match. If the target
     *         attribute of the comparison is of type Binary, then the operator looks
     *         for a subsequence of the target that matches the input. If the target
     *         attribute of the comparison is a set ("SS",
     *         "NS", or "BS"), then the operator evaluates
     *         to true if it finds an exact match with any member of the set.
     *         
CONTAINS is supported for lists: When evaluating "a CONTAINS
     *         b", "a" can be a list; however, "b"
     *         cannot be a set, a map, or a list. 
 

     *         
NOT_CONTAINS : Checks for absence of a subsequence, or
     *         absence of a value in a set. 
AttributeValueList can contain
     *         only one AttributeValue element of type String, Number, or
     *         Binary (not a set type). If the target attribute of the comparison is
     *         a String, then the operator checks for the absence of a substring
     *         match. If the target attribute of the comparison is Binary, then the
     *         operator checks for the absence of a subsequence of the target that
     *         matches the input. If the target attribute of the comparison is a set
     *         ("SS", "NS", or "BS"), then the
     *         operator evaluates to true if it does not find an exact match
     *         with any member of the set. 
NOT_CONTAINS is supported for lists:
     *         When evaluating "a NOT CONTAINS b", "a" can
     *         be a list; however, "b" cannot be a set, a map, or a
     *         list. 
 
 
BEGINS_WITH : Checks for a prefix.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String or Binary (not a Number or a set
     *         type). The target attribute of the comparison must be of type String
     *         or Binary (not a Number or a set type). 
 
 

     *         
IN : Checks for matching elements within two sets.
     *         
AttributeValueList can contain one or more
     *         AttributeValue elements of type String, Number, or Binary (not
     *         a set type). These attributes are compared against an existing set
     *         type attribute of an item. If any elements of the input set are
     *         present in the item attribute, the expression evaluates to true. 
     *         
 
BETWEEN : Greater than or equal to the first
     *         value, and less than or equal to the second value.
     *         
AttributeValueList must contain two AttributeValue
     *         elements of the same type, either String, Number, or Binary (not a set
     *         type). A target attribute matches if the target value is greater than,
     *         or equal to, the first element and less than, or equal to, the second
     *         element. If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not compare to
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     *         usage examples of AttributeValueList and
     *         ComparisonOperator, see Legacy
     *         Conditional Parameters in the Amazon DynamoDB Developer
     *         Guide. 
For backward compatibility with previous DynamoDB
     *         releases, the following parameters can be used instead of
     *         AttributeValueList and ComparisonOperator: 
 

     *         
Value - A value for DynamoDB to compare with an attribute.
     *         
 
 
Exists - A Boolean value that causes DynamoDB to
     *         evaluate the value before attempting the conditional operation: 

     *         
 
If Exists is true, DynamoDB will check to
     *         see if that attribute value already exists in the table. If it is
     *         found, then the condition evaluates to true; otherwise the condition
     *         evaluate to false. 
 
If Exists is
     *         false, DynamoDB assumes that the attribute value does
     *         not exist in the table. If in fact the value does not exist,
     *         then the assumption is valid and the condition evaluates to true. If
     *         the value is found, despite the assumption that it does not exist, the
     *         condition evaluates to false.
 
 
Note that the default
     *         value for Exists is true. 
 
 
The
     *         Value and Exists parameters are incompatible with
     *         AttributeValueList and ComparisonOperator. Note that if
     *         you use both sets of parameters at once, DynamoDB will return a
     *         ValidationException exception. 
This parameter does not
     *         support attributes of type List or Map.
     */
    public java.util.Map getExpected() {
        
        return expected;
    }
    
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A map of attribute/condition pairs.
     * Expected provides a conditional block for the DeleteItem
     * operation. 
Each element of Expected consists of an attribute
     * name, a comparison operator, and one or more values. DynamoDB compares
     * the attribute with the value(s) you supplied, using the comparison
     * operator. For each Expected element, the result of the
     * evaluation is either true or false. 
If you specify more than one
     * element in the Expected map, then by default all of the
     * conditions must evaluate to true. In other words, the conditions are
     * ANDed together. (You can use the ConditionalOperator parameter
     * to OR the conditions instead. If you do this, then at least one of the
     * conditions must evaluate to true, rather than all of them.) 
If the
     * Expected map evaluates to true, then the conditional operation
     * succeeds; otherwise, it fails. 
Expected contains the
     * following: 
 
 
AttributeValueList - One or more values
     * to evaluate against the supplied attribute. The number of values in
     * the list depends on the ComparisonOperator being used. 
For
     * type Number, value comparisons are numeric. 
String value
     * comparisons for greater than, equals, or less than are based on ASCII
     * character code values. For example, a is greater than
     * A, and a is greater than B. For
     * a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     * 
For type Binary, DynamoDB treats each byte of the binary data as
     * unsigned when it compares binary values. 
 

     * 
ComparisonOperator - A comparator for evaluating attributes
     * in the AttributeValueList. When performing the comparison,
     * DynamoDB uses strongly consistent reads. 
The following comparison
     * operators are available: 
EQ | NE | LE | LT | GE | GT |
     * NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     * BETWEEN 
The following are descriptions of each comparison
     * operator. 
 
 
EQ : Equal. EQ is
     * supported for all datatypes, including lists and maps.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, Binary, String
     * Set, Number Set, or Binary Set. If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not equal {"NS":["6", "2",
     * "1"]}. 
 
 
 
NE : Not equal.
     * NE is supported for all datatypes, including lists and
     * maps. 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, Binary, String Set,
     * Number Set, or Binary Set. If an item contains an
     * AttributeValue of a different type than the one provided in the
     * request, the value does not match. For example, {"S":"6"}
     * does not equal {"N":"6"}. Also, {"N":"6"}
     * does not equal {"NS":["6", "2", "1"]}. 
 
 

     * 
LE : Less than or equal. 
AttributeValueList
     * can contain only one AttributeValue element of type String,
     * Number, or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
LT : Less than.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, or Binary (not a set
     * type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GE : Greater than or equal.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GT : Greater than. 
AttributeValueList can
     * contain only one AttributeValue element of type String, Number,
     * or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
NOT_NULL : The attribute
     * exists. NOT_NULL is supported for all datatypes,
     * including lists and maps. 
This operator tests for the
     * existence of an attribute, not its data type. If the data type of
     * attribute "a" is null, and you evaluate it using
     * NOT_NULL, the result is a Boolean true. This
     * result is because the attribute "a" exists; its data type
     * is not relevant to the NOT_NULL comparison operator.
     *  
 
 
NULL : The attribute does not
     * exist. NULL is supported for all datatypes, including
     * lists and maps. 
This operator tests for the nonexistence of
     * an attribute, not its data type. If the data type of attribute
     * "a" is null, and you evaluate it using NULL,
     * the result is a Boolean false. This is because the attribute
     * "a" exists; its data type is not relevant to the
     * NULL comparison operator.  
 

     * 
CONTAINS : Checks for a subsequence, or value in a
     * set. 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If the target attribute of the comparison is of type
     * String, then the operator checks for a substring match. If the target
     * attribute of the comparison is of type Binary, then the operator looks
     * for a subsequence of the target that matches the input. If the target
     * attribute of the comparison is a set ("SS",
     * "NS", or "BS"), then the operator evaluates
     * to true if it finds an exact match with any member of the set.
     * 
CONTAINS is supported for lists: When evaluating "a CONTAINS
     * b", "a" can be a list; however, "b"
     * cannot be a set, a map, or a list. 
 

     * 
NOT_CONTAINS : Checks for absence of a subsequence, or
     * absence of a value in a set. 
AttributeValueList can contain
     * only one AttributeValue element of type String, Number, or
     * Binary (not a set type). If the target attribute of the comparison is
     * a String, then the operator checks for the absence of a substring
     * match. If the target attribute of the comparison is Binary, then the
     * operator checks for the absence of a subsequence of the target that
     * matches the input. If the target attribute of the comparison is a set
     * ("SS", "NS", or "BS"), then the
     * operator evaluates to true if it does not find an exact match
     * with any member of the set. 
NOT_CONTAINS is supported for lists:
     * When evaluating "a NOT CONTAINS b", "a" can
     * be a list; however, "b" cannot be a set, a map, or a
     * list. 
 
 
BEGINS_WITH : Checks for a prefix.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String or Binary (not a Number or a set
     * type). The target attribute of the comparison must be of type String
     * or Binary (not a Number or a set type). 
 
 

     * 
IN : Checks for matching elements within two sets.
     * 
AttributeValueList can contain one or more
     * AttributeValue elements of type String, Number, or Binary (not
     * a set type). These attributes are compared against an existing set
     * type attribute of an item. If any elements of the input set are
     * present in the item attribute, the expression evaluates to true. 
     * 
 
BETWEEN : Greater than or equal to the first
     * value, and less than or equal to the second value.
     * 
AttributeValueList must contain two AttributeValue
     * elements of the same type, either String, Number, or Binary (not a set
     * type). A target attribute matches if the target value is greater than,
     * or equal to, the first element and less than, or equal to, the second
     * element. If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not compare to
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     * usage examples of AttributeValueList and
     * ComparisonOperator, see Legacy
     * Conditional Parameters in the Amazon DynamoDB Developer
     * Guide. 
For backward compatibility with previous DynamoDB
     * releases, the following parameters can be used instead of
     * AttributeValueList and ComparisonOperator: 
 

     * 
Value - A value for DynamoDB to compare with an attribute.
     * 
 
 
Exists - A Boolean value that causes DynamoDB to
     * evaluate the value before attempting the conditional operation: 

     * 
 
If Exists is true, DynamoDB will check to
     * see if that attribute value already exists in the table. If it is
     * found, then the condition evaluates to true; otherwise the condition
     * evaluate to false. 
 
If Exists is
     * false, DynamoDB assumes that the attribute value does
     * not exist in the table. If in fact the value does not exist,
     * then the assumption is valid and the condition evaluates to true. If
     * the value is found, despite the assumption that it does not exist, the
     * condition evaluates to false.
 
 
Note that the default
     * value for Exists is true. 
 
 
The
     * Value and Exists parameters are incompatible with
     * AttributeValueList and ComparisonOperator. Note that if
     * you use both sets of parameters at once, DynamoDB will return a
     * ValidationException exception. 
This parameter does not
     * support attributes of type List or Map.
     *
     * @param expected  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A map of attribute/condition pairs.
     *         Expected provides a conditional block for the DeleteItem
     *         operation. 
Each element of Expected consists of an attribute
     *         name, a comparison operator, and one or more values. DynamoDB compares
     *         the attribute with the value(s) you supplied, using the comparison
     *         operator. For each Expected element, the result of the
     *         evaluation is either true or false. 
If you specify more than one
     *         element in the Expected map, then by default all of the
     *         conditions must evaluate to true. In other words, the conditions are
     *         ANDed together. (You can use the ConditionalOperator parameter
     *         to OR the conditions instead. If you do this, then at least one of the
     *         conditions must evaluate to true, rather than all of them.) 
If the
     *         Expected map evaluates to true, then the conditional operation
     *         succeeds; otherwise, it fails. 
Expected contains the
     *         following: 
 
 
AttributeValueList - One or more values
     *         to evaluate against the supplied attribute. The number of values in
     *         the list depends on the ComparisonOperator being used. 
For
     *         type Number, value comparisons are numeric. 
String value
     *         comparisons for greater than, equals, or less than are based on ASCII
     *         character code values. For example, a is greater than
     *         A, and a is greater than B. For
     *         a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     *         
For type Binary, DynamoDB treats each byte of the binary data as
     *         unsigned when it compares binary values. 
 

     *         
ComparisonOperator - A comparator for evaluating attributes
     *         in the AttributeValueList. When performing the comparison,
     *         DynamoDB uses strongly consistent reads. 
The following comparison
     *         operators are available: 
EQ | NE | LE | LT | GE | GT |
     *         NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     *         BETWEEN 
The following are descriptions of each comparison
     *         operator. 
 
 
EQ : Equal. EQ is
     *         supported for all datatypes, including lists and maps.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, Binary, String
     *         Set, Number Set, or Binary Set. If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not equal {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NE : Not equal.
     *         NE is supported for all datatypes, including lists and
     *         maps. 
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, Binary, String Set,
     *         Number Set, or Binary Set. If an item contains an
     *         AttributeValue of a different type than the one provided in the
     *         request, the value does not match. For example, {"S":"6"}
     *         does not equal {"N":"6"}. Also, {"N":"6"}
     *         does not equal {"NS":["6", "2", "1"]}. 
 
 

     *         
LE : Less than or equal. 
AttributeValueList
     *         can contain only one AttributeValue element of type String,
     *         Number, or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
LT : Less than.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, or Binary (not a set
     *         type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GE : Greater than or equal.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GT : Greater than. 
AttributeValueList can
     *         contain only one AttributeValue element of type String, Number,
     *         or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NOT_NULL : The attribute
     *         exists. NOT_NULL is supported for all datatypes,
     *         including lists and maps. 
This operator tests for the
     *         existence of an attribute, not its data type. If the data type of
     *         attribute "a" is null, and you evaluate it using
     *         NOT_NULL, the result is a Boolean true. This
     *         result is because the attribute "a" exists; its data type
     *         is not relevant to the NOT_NULL comparison operator.
     *          
 
 
NULL : The attribute does not
     *         exist. NULL is supported for all datatypes, including
     *         lists and maps. 
This operator tests for the nonexistence of
     *         an attribute, not its data type. If the data type of attribute
     *         "a" is null, and you evaluate it using NULL,
     *         the result is a Boolean false. This is because the attribute
     *         "a" exists; its data type is not relevant to the
     *         NULL comparison operator.  
 

     *         
CONTAINS : Checks for a subsequence, or value in a
     *         set. 
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If the target attribute of the comparison is of type
     *         String, then the operator checks for a substring match. If the target
     *         attribute of the comparison is of type Binary, then the operator looks
     *         for a subsequence of the target that matches the input. If the target
     *         attribute of the comparison is a set ("SS",
     *         "NS", or "BS"), then the operator evaluates
     *         to true if it finds an exact match with any member of the set.
     *         
CONTAINS is supported for lists: When evaluating "a CONTAINS
     *         b", "a" can be a list; however, "b"
     *         cannot be a set, a map, or a list. 
 

     *         
NOT_CONTAINS : Checks for absence of a subsequence, or
     *         absence of a value in a set. 
AttributeValueList can contain
     *         only one AttributeValue element of type String, Number, or
     *         Binary (not a set type). If the target attribute of the comparison is
     *         a String, then the operator checks for the absence of a substring
     *         match. If the target attribute of the comparison is Binary, then the
     *         operator checks for the absence of a subsequence of the target that
     *         matches the input. If the target attribute of the comparison is a set
     *         ("SS", "NS", or "BS"), then the
     *         operator evaluates to true if it does not find an exact match
     *         with any member of the set. 
NOT_CONTAINS is supported for lists:
     *         When evaluating "a NOT CONTAINS b", "a" can
     *         be a list; however, "b" cannot be a set, a map, or a
     *         list. 
 
 
BEGINS_WITH : Checks for a prefix.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String or Binary (not a Number or a set
     *         type). The target attribute of the comparison must be of type String
     *         or Binary (not a Number or a set type). 
 
 

     *         
IN : Checks for matching elements within two sets.
     *         
AttributeValueList can contain one or more
     *         AttributeValue elements of type String, Number, or Binary (not
     *         a set type). These attributes are compared against an existing set
     *         type attribute of an item. If any elements of the input set are
     *         present in the item attribute, the expression evaluates to true. 
     *         
 
BETWEEN : Greater than or equal to the first
     *         value, and less than or equal to the second value.
     *         
AttributeValueList must contain two AttributeValue
     *         elements of the same type, either String, Number, or Binary (not a set
     *         type). A target attribute matches if the target value is greater than,
     *         or equal to, the first element and less than, or equal to, the second
     *         element. If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not compare to
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     *         usage examples of AttributeValueList and
     *         ComparisonOperator, see Legacy
     *         Conditional Parameters in the Amazon DynamoDB Developer
     *         Guide. 
For backward compatibility with previous DynamoDB
     *         releases, the following parameters can be used instead of
     *         AttributeValueList and ComparisonOperator: 
 

     *         
Value - A value for DynamoDB to compare with an attribute.
     *         
 
 
Exists - A Boolean value that causes DynamoDB to
     *         evaluate the value before attempting the conditional operation: 

     *         
 
If Exists is true, DynamoDB will check to
     *         see if that attribute value already exists in the table. If it is
     *         found, then the condition evaluates to true; otherwise the condition
     *         evaluate to false. 
 
If Exists is
     *         false, DynamoDB assumes that the attribute value does
     *         not exist in the table. If in fact the value does not exist,
     *         then the assumption is valid and the condition evaluates to true. If
     *         the value is found, despite the assumption that it does not exist, the
     *         condition evaluates to false.
 
 
Note that the default
     *         value for Exists is true. 
 
 
The
     *         Value and Exists parameters are incompatible with
     *         AttributeValueList and ComparisonOperator. Note that if
     *         you use both sets of parameters at once, DynamoDB will return a
     *         ValidationException exception. 
This parameter does not
     *         support attributes of type List or Map.
     */
    public void setExpected(java.util.Map expected) {
        this.expected = expected;
    }
    
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A map of attribute/condition pairs.
     * Expected provides a conditional block for the DeleteItem
     * operation. 
Each element of Expected consists of an attribute
     * name, a comparison operator, and one or more values. DynamoDB compares
     * the attribute with the value(s) you supplied, using the comparison
     * operator. For each Expected element, the result of the
     * evaluation is either true or false. 
If you specify more than one
     * element in the Expected map, then by default all of the
     * conditions must evaluate to true. In other words, the conditions are
     * ANDed together. (You can use the ConditionalOperator parameter
     * to OR the conditions instead. If you do this, then at least one of the
     * conditions must evaluate to true, rather than all of them.) 
If the
     * Expected map evaluates to true, then the conditional operation
     * succeeds; otherwise, it fails. 
Expected contains the
     * following: 
 
 
AttributeValueList - One or more values
     * to evaluate against the supplied attribute. The number of values in
     * the list depends on the ComparisonOperator being used. 
For
     * type Number, value comparisons are numeric. 
String value
     * comparisons for greater than, equals, or less than are based on ASCII
     * character code values. For example, a is greater than
     * A, and a is greater than B. For
     * a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     * 
For type Binary, DynamoDB treats each byte of the binary data as
     * unsigned when it compares binary values. 
 

     * 
ComparisonOperator - A comparator for evaluating attributes
     * in the AttributeValueList. When performing the comparison,
     * DynamoDB uses strongly consistent reads. 
The following comparison
     * operators are available: 
EQ | NE | LE | LT | GE | GT |
     * NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     * BETWEEN 
The following are descriptions of each comparison
     * operator. 
 
 
EQ : Equal. EQ is
     * supported for all datatypes, including lists and maps.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, Binary, String
     * Set, Number Set, or Binary Set. If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not equal {"NS":["6", "2",
     * "1"]}. 
 
 
 
NE : Not equal.
     * NE is supported for all datatypes, including lists and
     * maps. 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, Binary, String Set,
     * Number Set, or Binary Set. If an item contains an
     * AttributeValue of a different type than the one provided in the
     * request, the value does not match. For example, {"S":"6"}
     * does not equal {"N":"6"}. Also, {"N":"6"}
     * does not equal {"NS":["6", "2", "1"]}. 
 
 

     * 
LE : Less than or equal. 
AttributeValueList
     * can contain only one AttributeValue element of type String,
     * Number, or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
LT : Less than.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, or Binary (not a set
     * type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GE : Greater than or equal.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GT : Greater than. 
AttributeValueList can
     * contain only one AttributeValue element of type String, Number,
     * or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
NOT_NULL : The attribute
     * exists. NOT_NULL is supported for all datatypes,
     * including lists and maps. 
This operator tests for the
     * existence of an attribute, not its data type. If the data type of
     * attribute "a" is null, and you evaluate it using
     * NOT_NULL, the result is a Boolean true. This
     * result is because the attribute "a" exists; its data type
     * is not relevant to the NOT_NULL comparison operator.
     *  
 
 
NULL : The attribute does not
     * exist. NULL is supported for all datatypes, including
     * lists and maps. 
This operator tests for the nonexistence of
     * an attribute, not its data type. If the data type of attribute
     * "a" is null, and you evaluate it using NULL,
     * the result is a Boolean false. This is because the attribute
     * "a" exists; its data type is not relevant to the
     * NULL comparison operator.  
 

     * 
CONTAINS : Checks for a subsequence, or value in a
     * set. 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If the target attribute of the comparison is of type
     * String, then the operator checks for a substring match. If the target
     * attribute of the comparison is of type Binary, then the operator looks
     * for a subsequence of the target that matches the input. If the target
     * attribute of the comparison is a set ("SS",
     * "NS", or "BS"), then the operator evaluates
     * to true if it finds an exact match with any member of the set.
     * 
CONTAINS is supported for lists: When evaluating "a CONTAINS
     * b", "a" can be a list; however, "b"
     * cannot be a set, a map, or a list. 
 

     * 
NOT_CONTAINS : Checks for absence of a subsequence, or
     * absence of a value in a set. 
AttributeValueList can contain
     * only one AttributeValue element of type String, Number, or
     * Binary (not a set type). If the target attribute of the comparison is
     * a String, then the operator checks for the absence of a substring
     * match. If the target attribute of the comparison is Binary, then the
     * operator checks for the absence of a subsequence of the target that
     * matches the input. If the target attribute of the comparison is a set
     * ("SS", "NS", or "BS"), then the
     * operator evaluates to true if it does not find an exact match
     * with any member of the set. 
NOT_CONTAINS is supported for lists:
     * When evaluating "a NOT CONTAINS b", "a" can
     * be a list; however, "b" cannot be a set, a map, or a
     * list. 
 
 
BEGINS_WITH : Checks for a prefix.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String or Binary (not a Number or a set
     * type). The target attribute of the comparison must be of type String
     * or Binary (not a Number or a set type). 
 
 

     * 
IN : Checks for matching elements within two sets.
     * 
AttributeValueList can contain one or more
     * AttributeValue elements of type String, Number, or Binary (not
     * a set type). These attributes are compared against an existing set
     * type attribute of an item. If any elements of the input set are
     * present in the item attribute, the expression evaluates to true. 
     * 
 
BETWEEN : Greater than or equal to the first
     * value, and less than or equal to the second value.
     * 
AttributeValueList must contain two AttributeValue
     * elements of the same type, either String, Number, or Binary (not a set
     * type). A target attribute matches if the target value is greater than,
     * or equal to, the first element and less than, or equal to, the second
     * element. If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not compare to
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     * usage examples of AttributeValueList and
     * ComparisonOperator, see Legacy
     * Conditional Parameters in the Amazon DynamoDB Developer
     * Guide. 
For backward compatibility with previous DynamoDB
     * releases, the following parameters can be used instead of
     * AttributeValueList and ComparisonOperator: 
 

     * 
Value - A value for DynamoDB to compare with an attribute.
     * 
 
 
Exists - A Boolean value that causes DynamoDB to
     * evaluate the value before attempting the conditional operation: 

     * 
 
If Exists is true, DynamoDB will check to
     * see if that attribute value already exists in the table. If it is
     * found, then the condition evaluates to true; otherwise the condition
     * evaluate to false. 
 
If Exists is
     * false, DynamoDB assumes that the attribute value does
     * not exist in the table. If in fact the value does not exist,
     * then the assumption is valid and the condition evaluates to true. If
     * the value is found, despite the assumption that it does not exist, the
     * condition evaluates to false.
 
 
Note that the default
     * value for Exists is true. 
 
 
The
     * Value and Exists parameters are incompatible with
     * AttributeValueList and ComparisonOperator. Note that if
     * you use both sets of parameters at once, DynamoDB will return a
     * ValidationException exception. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param expected  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A map of attribute/condition pairs.
     *         Expected provides a conditional block for the DeleteItem
     *         operation. 
Each element of Expected consists of an attribute
     *         name, a comparison operator, and one or more values. DynamoDB compares
     *         the attribute with the value(s) you supplied, using the comparison
     *         operator. For each Expected element, the result of the
     *         evaluation is either true or false. 
If you specify more than one
     *         element in the Expected map, then by default all of the
     *         conditions must evaluate to true. In other words, the conditions are
     *         ANDed together. (You can use the ConditionalOperator parameter
     *         to OR the conditions instead. If you do this, then at least one of the
     *         conditions must evaluate to true, rather than all of them.) 
If the
     *         Expected map evaluates to true, then the conditional operation
     *         succeeds; otherwise, it fails. 
Expected contains the
     *         following: 
 
 
AttributeValueList - One or more values
     *         to evaluate against the supplied attribute. The number of values in
     *         the list depends on the ComparisonOperator being used. 
For
     *         type Number, value comparisons are numeric. 
String value
     *         comparisons for greater than, equals, or less than are based on ASCII
     *         character code values. For example, a is greater than
     *         A, and a is greater than B. For
     *         a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     *         
For type Binary, DynamoDB treats each byte of the binary data as
     *         unsigned when it compares binary values. 
 

     *         
ComparisonOperator - A comparator for evaluating attributes
     *         in the AttributeValueList. When performing the comparison,
     *         DynamoDB uses strongly consistent reads. 
The following comparison
     *         operators are available: 
EQ | NE | LE | LT | GE | GT |
     *         NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     *         BETWEEN 
The following are descriptions of each comparison
     *         operator. 
 
 
EQ : Equal. EQ is
     *         supported for all datatypes, including lists and maps.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, Binary, String
     *         Set, Number Set, or Binary Set. If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not equal {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NE : Not equal.
     *         NE is supported for all datatypes, including lists and
     *         maps. 
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, Binary, String Set,
     *         Number Set, or Binary Set. If an item contains an
     *         AttributeValue of a different type than the one provided in the
     *         request, the value does not match. For example, {"S":"6"}
     *         does not equal {"N":"6"}. Also, {"N":"6"}
     *         does not equal {"NS":["6", "2", "1"]}. 
 
 

     *         
LE : Less than or equal. 
AttributeValueList
     *         can contain only one AttributeValue element of type String,
     *         Number, or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
LT : Less than.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String, Number, or Binary (not a set
     *         type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GE : Greater than or equal.
     *         
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not equal
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]}. 
 
 

     *         
GT : Greater than. 
AttributeValueList can
     *         contain only one AttributeValue element of type String, Number,
     *         or Binary (not a set type). If an item contains an
     *         AttributeValue element of a different type than the one
     *         provided in the request, the value does not match. For example,
     *         {"S":"6"} does not equal {"N":"6"}. Also,
     *         {"N":"6"} does not compare to {"NS":["6", "2",
     *         "1"]}. 
 
 
 
NOT_NULL : The attribute
     *         exists. NOT_NULL is supported for all datatypes,
     *         including lists and maps. 
This operator tests for the
     *         existence of an attribute, not its data type. If the data type of
     *         attribute "a" is null, and you evaluate it using
     *         NOT_NULL, the result is a Boolean true. This
     *         result is because the attribute "a" exists; its data type
     *         is not relevant to the NOT_NULL comparison operator.
     *          
 
 
NULL : The attribute does not
     *         exist. NULL is supported for all datatypes, including
     *         lists and maps. 
This operator tests for the nonexistence of
     *         an attribute, not its data type. If the data type of attribute
     *         "a" is null, and you evaluate it using NULL,
     *         the result is a Boolean false. This is because the attribute
     *         "a" exists; its data type is not relevant to the
     *         NULL comparison operator.  
 

     *         
CONTAINS : Checks for a subsequence, or value in a
     *         set. 
AttributeValueList can contain only one
     *         AttributeValue element of type String, Number, or Binary (not a
     *         set type). If the target attribute of the comparison is of type
     *         String, then the operator checks for a substring match. If the target
     *         attribute of the comparison is of type Binary, then the operator looks
     *         for a subsequence of the target that matches the input. If the target
     *         attribute of the comparison is a set ("SS",
     *         "NS", or "BS"), then the operator evaluates
     *         to true if it finds an exact match with any member of the set.
     *         
CONTAINS is supported for lists: When evaluating "a CONTAINS
     *         b", "a" can be a list; however, "b"
     *         cannot be a set, a map, or a list. 
 

     *         
NOT_CONTAINS : Checks for absence of a subsequence, or
     *         absence of a value in a set. 
AttributeValueList can contain
     *         only one AttributeValue element of type String, Number, or
     *         Binary (not a set type). If the target attribute of the comparison is
     *         a String, then the operator checks for the absence of a substring
     *         match. If the target attribute of the comparison is Binary, then the
     *         operator checks for the absence of a subsequence of the target that
     *         matches the input. If the target attribute of the comparison is a set
     *         ("SS", "NS", or "BS"), then the
     *         operator evaluates to true if it does not find an exact match
     *         with any member of the set. 
NOT_CONTAINS is supported for lists:
     *         When evaluating "a NOT CONTAINS b", "a" can
     *         be a list; however, "b" cannot be a set, a map, or a
     *         list. 
 
 
BEGINS_WITH : Checks for a prefix.
     *         
AttributeValueList can contain only one
     *         AttributeValue of type String or Binary (not a Number or a set
     *         type). The target attribute of the comparison must be of type String
     *         or Binary (not a Number or a set type). 
 
 

     *         
IN : Checks for matching elements within two sets.
     *         
AttributeValueList can contain one or more
     *         AttributeValue elements of type String, Number, or Binary (not
     *         a set type). These attributes are compared against an existing set
     *         type attribute of an item. If any elements of the input set are
     *         present in the item attribute, the expression evaluates to true. 
     *         
 
BETWEEN : Greater than or equal to the first
     *         value, and less than or equal to the second value.
     *         
AttributeValueList must contain two AttributeValue
     *         elements of the same type, either String, Number, or Binary (not a set
     *         type). A target attribute matches if the target value is greater than,
     *         or equal to, the first element and less than, or equal to, the second
     *         element. If an item contains an AttributeValue element of a
     *         different type than the one provided in the request, the value does
     *         not match. For example, {"S":"6"} does not compare to
     *         {"N":"6"}. Also, {"N":"6"} does not compare
     *         to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     *         usage examples of AttributeValueList and
     *         ComparisonOperator, see Legacy
     *         Conditional Parameters in the Amazon DynamoDB Developer
     *         Guide. 
For backward compatibility with previous DynamoDB
     *         releases, the following parameters can be used instead of
     *         AttributeValueList and ComparisonOperator: 
 

     *         
Value - A value for DynamoDB to compare with an attribute.
     *         
 
 
Exists - A Boolean value that causes DynamoDB to
     *         evaluate the value before attempting the conditional operation: 

     *         
 
If Exists is true, DynamoDB will check to
     *         see if that attribute value already exists in the table. If it is
     *         found, then the condition evaluates to true; otherwise the condition
     *         evaluate to false. 
 
If Exists is
     *         false, DynamoDB assumes that the attribute value does
     *         not exist in the table. If in fact the value does not exist,
     *         then the assumption is valid and the condition evaluates to true. If
     *         the value is found, despite the assumption that it does not exist, the
     *         condition evaluates to false.
 
 
Note that the default
     *         value for Exists is true. 
 
 
The
     *         Value and Exists parameters are incompatible with
     *         AttributeValueList and ComparisonOperator. Note that if
     *         you use both sets of parameters at once, DynamoDB will return a
     *         ValidationException exception. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withExpected(java.util.Map expected) {
        setExpected(expected);
        return this;
    }

    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A map of attribute/condition pairs.
     * Expected provides a conditional block for the DeleteItem
     * operation. 
Each element of Expected consists of an attribute
     * name, a comparison operator, and one or more values. DynamoDB compares
     * the attribute with the value(s) you supplied, using the comparison
     * operator. For each Expected element, the result of the
     * evaluation is either true or false. 
If you specify more than one
     * element in the Expected map, then by default all of the
     * conditions must evaluate to true. In other words, the conditions are
     * ANDed together. (You can use the ConditionalOperator parameter
     * to OR the conditions instead. If you do this, then at least one of the
     * conditions must evaluate to true, rather than all of them.) 
If the
     * Expected map evaluates to true, then the conditional operation
     * succeeds; otherwise, it fails. 
Expected contains the
     * following: 
 
 
AttributeValueList - One or more values
     * to evaluate against the supplied attribute. The number of values in
     * the list depends on the ComparisonOperator being used. 
For
     * type Number, value comparisons are numeric. 
String value
     * comparisons for greater than, equals, or less than are based on ASCII
     * character code values. For example, a is greater than
     * A, and a is greater than B. For
     * a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
     * 
For type Binary, DynamoDB treats each byte of the binary data as
     * unsigned when it compares binary values. 
 

     * 
ComparisonOperator - A comparator for evaluating attributes
     * in the AttributeValueList. When performing the comparison,
     * DynamoDB uses strongly consistent reads. 
The following comparison
     * operators are available: 
EQ | NE | LE | LT | GE | GT |
     * NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN |
     * BETWEEN 
The following are descriptions of each comparison
     * operator. 
 
 
EQ : Equal. EQ is
     * supported for all datatypes, including lists and maps.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, Binary, String
     * Set, Number Set, or Binary Set. If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not equal {"NS":["6", "2",
     * "1"]}. 
 
 
 
NE : Not equal.
     * NE is supported for all datatypes, including lists and
     * maps. 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, Binary, String Set,
     * Number Set, or Binary Set. If an item contains an
     * AttributeValue of a different type than the one provided in the
     * request, the value does not match. For example, {"S":"6"}
     * does not equal {"N":"6"}. Also, {"N":"6"}
     * does not equal {"NS":["6", "2", "1"]}. 
 
 

     * 
LE : Less than or equal. 
AttributeValueList
     * can contain only one AttributeValue element of type String,
     * Number, or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
LT : Less than.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String, Number, or Binary (not a set
     * type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GE : Greater than or equal.
     * 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not equal
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]}. 
 
 

     * 
GT : Greater than. 
AttributeValueList can
     * contain only one AttributeValue element of type String, Number,
     * or Binary (not a set type). If an item contains an
     * AttributeValue element of a different type than the one
     * provided in the request, the value does not match. For example,
     * {"S":"6"} does not equal {"N":"6"}. Also,
     * {"N":"6"} does not compare to {"NS":["6", "2",
     * "1"]}. 
 
 
 
NOT_NULL : The attribute
     * exists. NOT_NULL is supported for all datatypes,
     * including lists and maps. 
This operator tests for the
     * existence of an attribute, not its data type. If the data type of
     * attribute "a" is null, and you evaluate it using
     * NOT_NULL, the result is a Boolean true. This
     * result is because the attribute "a" exists; its data type
     * is not relevant to the NOT_NULL comparison operator.
     *  
 
 
NULL : The attribute does not
     * exist. NULL is supported for all datatypes, including
     * lists and maps. 
This operator tests for the nonexistence of
     * an attribute, not its data type. If the data type of attribute
     * "a" is null, and you evaluate it using NULL,
     * the result is a Boolean false. This is because the attribute
     * "a" exists; its data type is not relevant to the
     * NULL comparison operator.  
 

     * 
CONTAINS : Checks for a subsequence, or value in a
     * set. 
AttributeValueList can contain only one
     * AttributeValue element of type String, Number, or Binary (not a
     * set type). If the target attribute of the comparison is of type
     * String, then the operator checks for a substring match. If the target
     * attribute of the comparison is of type Binary, then the operator looks
     * for a subsequence of the target that matches the input. If the target
     * attribute of the comparison is a set ("SS",
     * "NS", or "BS"), then the operator evaluates
     * to true if it finds an exact match with any member of the set.
     * 
CONTAINS is supported for lists: When evaluating "a CONTAINS
     * b", "a" can be a list; however, "b"
     * cannot be a set, a map, or a list. 
 

     * 
NOT_CONTAINS : Checks for absence of a subsequence, or
     * absence of a value in a set. 
AttributeValueList can contain
     * only one AttributeValue element of type String, Number, or
     * Binary (not a set type). If the target attribute of the comparison is
     * a String, then the operator checks for the absence of a substring
     * match. If the target attribute of the comparison is Binary, then the
     * operator checks for the absence of a subsequence of the target that
     * matches the input. If the target attribute of the comparison is a set
     * ("SS", "NS", or "BS"), then the
     * operator evaluates to true if it does not find an exact match
     * with any member of the set. 
NOT_CONTAINS is supported for lists:
     * When evaluating "a NOT CONTAINS b", "a" can
     * be a list; however, "b" cannot be a set, a map, or a
     * list. 
 
 
BEGINS_WITH : Checks for a prefix.
     * 
AttributeValueList can contain only one
     * AttributeValue of type String or Binary (not a Number or a set
     * type). The target attribute of the comparison must be of type String
     * or Binary (not a Number or a set type). 
 
 

     * 
IN : Checks for matching elements within two sets.
     * 
AttributeValueList can contain one or more
     * AttributeValue elements of type String, Number, or Binary (not
     * a set type). These attributes are compared against an existing set
     * type attribute of an item. If any elements of the input set are
     * present in the item attribute, the expression evaluates to true. 
     * 
 
BETWEEN : Greater than or equal to the first
     * value, and less than or equal to the second value.
     * 
AttributeValueList must contain two AttributeValue
     * elements of the same type, either String, Number, or Binary (not a set
     * type). A target attribute matches if the target value is greater than,
     * or equal to, the first element and less than, or equal to, the second
     * element. If an item contains an AttributeValue element of a
     * different type than the one provided in the request, the value does
     * not match. For example, {"S":"6"} does not compare to
     * {"N":"6"}. Also, {"N":"6"} does not compare
     * to {"NS":["6", "2", "1"]} 
 
 
 
 
For
     * usage examples of AttributeValueList and
     * ComparisonOperator, see Legacy
     * Conditional Parameters in the Amazon DynamoDB Developer
     * Guide. 
For backward compatibility with previous DynamoDB
     * releases, the following parameters can be used instead of
     * AttributeValueList and ComparisonOperator: 
 

     * 
Value - A value for DynamoDB to compare with an attribute.
     * 
 
 
Exists - A Boolean value that causes DynamoDB to
     * evaluate the value before attempting the conditional operation: 

     * 
 
If Exists is true, DynamoDB will check to
     * see if that attribute value already exists in the table. If it is
     * found, then the condition evaluates to true; otherwise the condition
     * evaluate to false. 
 
If Exists is
     * false, DynamoDB assumes that the attribute value does
     * not exist in the table. If in fact the value does not exist,
     * then the assumption is valid and the condition evaluates to true. If
     * the value is found, despite the assumption that it does not exist, the
     * condition evaluates to false.
 
 
Note that the default
     * value for Exists is true. 
 
 
The
     * Value and Exists parameters are incompatible with
     * AttributeValueList and ComparisonOperator. Note that if
     * you use both sets of parameters at once, DynamoDB will return a
     * ValidationException exception. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * The method adds a new key-value pair into Expected parameter, and
     * returns a reference to this object so that method calls can be chained
     * together.
     *
     * @param key The key of the entry to be added into Expected.
     * @param value The corresponding value of the entry to be added into Expected.
     */
  public DeleteItemRequest addExpectedEntry(String key, ExpectedAttributeValue value) {
    if (null == this.expected) {
      this.expected = new java.util.HashMap();
    }
    if (this.expected.containsKey(key))
      throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
    this.expected.put(key, value);
    return this;
  }

  /**
   * Removes all the entries added into Expected.
   * 

   * Returns a reference to this object so that method calls can be chained together.
   */
  public DeleteItemRequest clearExpectedEntries() {
    this.expected = null;
    return this;
  }
  
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     *
     * @return  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A logical operator to apply to the
     *         conditions in the Expected map: 
 
AND -
     *         If all of the conditions evaluate to true, then the entire map
     *         evaluates to true.
 
OR - If at least one of
     *         the conditions evaluate to true, then the entire map evaluates to
     *         true.
 
 
If you omit ConditionalOperator, then
     *         AND is the default. 
The operation will succeed only if
     *         the entire map evaluates to true. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @see ConditionalOperator
     */
    public String getConditionalOperator() {
        return conditionalOperator;
    }
    
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     *
     * @param conditionalOperator  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A logical operator to apply to the
     *         conditions in the Expected map: 
 
AND -
     *         If all of the conditions evaluate to true, then the entire map
     *         evaluates to true.
 
OR - If at least one of
     *         the conditions evaluate to true, then the entire map evaluates to
     *         true.
 
 
If you omit ConditionalOperator, then
     *         AND is the default. 
The operation will succeed only if
     *         the entire map evaluates to true. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @see ConditionalOperator
     */
    public void setConditionalOperator(String conditionalOperator) {
        this.conditionalOperator = conditionalOperator;
    }
    
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     *
     * @param conditionalOperator  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A logical operator to apply to the
     *         conditions in the Expected map: 
 
AND -
     *         If all of the conditions evaluate to true, then the entire map
     *         evaluates to true.
 
OR - If at least one of
     *         the conditions evaluate to true, then the entire map evaluates to
     *         true.
 
 
If you omit ConditionalOperator, then
     *         AND is the default. 
The operation will succeed only if
     *         the entire map evaluates to true. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ConditionalOperator
     */
    public DeleteItemRequest withConditionalOperator(String conditionalOperator) {
        this.conditionalOperator = conditionalOperator;
        return this;
    }

    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     *
     * @param conditionalOperator  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A logical operator to apply to the
     *         conditions in the Expected map: 
 
AND -
     *         If all of the conditions evaluate to true, then the entire map
     *         evaluates to true.
 
OR - If at least one of
     *         the conditions evaluate to true, then the entire map evaluates to
     *         true.
 
 
If you omit ConditionalOperator, then
     *         AND is the default. 
The operation will succeed only if
     *         the entire map evaluates to true. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @see ConditionalOperator
     */
    public void setConditionalOperator(ConditionalOperator conditionalOperator) {
        this.conditionalOperator = conditionalOperator.toString();
    }
    
    /**
     *  
This is a legacy parameter, for backward compatibility.
     * New applications should use ConditionExpression instead. Do not
     * combine legacy parameters and expression parameters in a single API
     * call; otherwise, DynamoDB will return a ValidationException
     * exception.  
A logical operator to apply to the
     * conditions in the Expected map: 
 
AND -
     * If all of the conditions evaluate to true, then the entire map
     * evaluates to true.
 
OR - If at least one of
     * the conditions evaluate to true, then the entire map evaluates to
     * true.
 
 
If you omit ConditionalOperator, then
     * AND is the default. 
The operation will succeed only if
     * the entire map evaluates to true. 
This parameter does not
     * support attributes of type List or Map.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: AND, OR
     *
     * @param conditionalOperator  
This is a legacy parameter, for backward compatibility.
     *         New applications should use ConditionExpression instead. Do not
     *         combine legacy parameters and expression parameters in a single API
     *         call; otherwise, DynamoDB will return a ValidationException
     *         exception.  
A logical operator to apply to the
     *         conditions in the Expected map: 
 
AND -
     *         If all of the conditions evaluate to true, then the entire map
     *         evaluates to true.
 
OR - If at least one of
     *         the conditions evaluate to true, then the entire map evaluates to
     *         true.
 
 
If you omit ConditionalOperator, then
     *         AND is the default. 
The operation will succeed only if
     *         the entire map evaluates to true. 
This parameter does not
     *         support attributes of type List or Map.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ConditionalOperator
     */
    public DeleteItemRequest withConditionalOperator(ConditionalOperator conditionalOperator) {
        this.conditionalOperator = conditionalOperator.toString();
        return this;
    }

    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     *
     * @return Use ReturnValues if you want to get the item attributes as they
     *         appeared before they were deleted. For DeleteItem, the valid
     *         values are: 
 
 
NONE - If ReturnValues is
     *         not specified, or if its value is NONE, then nothing is
     *         returned. (This setting is the default for ReturnValues.) 
     *         
 
ALL_OLD - The content of the old item is
     *         returned. 
 
     *
     * @see ReturnValue
     */
    public String getReturnValues() {
        return returnValues;
    }
    
    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     *
     * @param returnValues Use ReturnValues if you want to get the item attributes as they
     *         appeared before they were deleted. For DeleteItem, the valid
     *         values are: 
 
 
NONE - If ReturnValues is
     *         not specified, or if its value is NONE, then nothing is
     *         returned. (This setting is the default for ReturnValues.) 
     *         
 
ALL_OLD - The content of the old item is
     *         returned. 
 
     *
     * @see ReturnValue
     */
    public void setReturnValues(String returnValues) {
        this.returnValues = returnValues;
    }
    
    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     *
     * @param returnValues Use ReturnValues if you want to get the item attributes as they
     *         appeared before they were deleted. For DeleteItem, the valid
     *         values are: 
 
 
NONE - If ReturnValues is
     *         not specified, or if its value is NONE, then nothing is
     *         returned. (This setting is the default for ReturnValues.) 
     *         
 
ALL_OLD - The content of the old item is
     *         returned. 
 
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnValue
     */
    public DeleteItemRequest withReturnValues(String returnValues) {
        this.returnValues = returnValues;
        return this;
    }

    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     *
     * @param returnValues Use ReturnValues if you want to get the item attributes as they
     *         appeared before they were deleted. For DeleteItem, the valid
     *         values are: 
 
 
NONE - If ReturnValues is
     *         not specified, or if its value is NONE, then nothing is
     *         returned. (This setting is the default for ReturnValues.) 
     *         
 
ALL_OLD - The content of the old item is
     *         returned. 
 
     *
     * @see ReturnValue
     */
    public void setReturnValues(ReturnValue returnValues) {
        this.returnValues = returnValues.toString();
    }
    
    /**
     * Use ReturnValues if you want to get the item attributes as they
     * appeared before they were deleted. For DeleteItem, the valid
     * values are: 
 
 
NONE - If ReturnValues is
     * not specified, or if its value is NONE, then nothing is
     * returned. (This setting is the default for ReturnValues.) 
     * 
 
ALL_OLD - The content of the old item is
     * returned. 
 
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
     *
     * @param returnValues Use ReturnValues if you want to get the item attributes as they
     *         appeared before they were deleted. For DeleteItem, the valid
     *         values are: 
 
 
NONE - If ReturnValues is
     *         not specified, or if its value is NONE, then nothing is
     *         returned. (This setting is the default for ReturnValues.) 
     *         
 
ALL_OLD - The content of the old item is
     *         returned. 
 
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnValue
     */
    public DeleteItemRequest withReturnValues(ReturnValue returnValues) {
        this.returnValues = returnValues.toString();
        return this;
    }

    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     *
     * @return A value that if set to TOTAL, the response includes
     *         ConsumedCapacity data for tables and indexes. If set to
     *         INDEXES, the response includes ConsumedCapacity
     *         for indexes. If set to NONE (the default),
     *         ConsumedCapacity is not included in the response.
     *
     * @see ReturnConsumedCapacity
     */
    public String getReturnConsumedCapacity() {
        return returnConsumedCapacity;
    }
    
    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     *
     * @param returnConsumedCapacity A value that if set to TOTAL, the response includes
     *         ConsumedCapacity data for tables and indexes. If set to
     *         INDEXES, the response includes ConsumedCapacity
     *         for indexes. If set to NONE (the default),
     *         ConsumedCapacity is not included in the response.
     *
     * @see ReturnConsumedCapacity
     */
    public void setReturnConsumedCapacity(String returnConsumedCapacity) {
        this.returnConsumedCapacity = returnConsumedCapacity;
    }
    
    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     *
     * @param returnConsumedCapacity A value that if set to TOTAL, the response includes
     *         ConsumedCapacity data for tables and indexes. If set to
     *         INDEXES, the response includes ConsumedCapacity
     *         for indexes. If set to NONE (the default),
     *         ConsumedCapacity is not included in the response.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnConsumedCapacity
     */
    public DeleteItemRequest withReturnConsumedCapacity(String returnConsumedCapacity) {
        this.returnConsumedCapacity = returnConsumedCapacity;
        return this;
    }

    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     *
     * @param returnConsumedCapacity A value that if set to TOTAL, the response includes
     *         ConsumedCapacity data for tables and indexes. If set to
     *         INDEXES, the response includes ConsumedCapacity
     *         for indexes. If set to NONE (the default),
     *         ConsumedCapacity is not included in the response.
     *
     * @see ReturnConsumedCapacity
     */
    public void setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity) {
        this.returnConsumedCapacity = returnConsumedCapacity.toString();
    }
    
    /**
     * A value that if set to TOTAL, the response includes
     * ConsumedCapacity data for tables and indexes. If set to
     * INDEXES, the response includes ConsumedCapacity
     * for indexes. If set to NONE (the default),
     * ConsumedCapacity is not included in the response.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: INDEXES, TOTAL, NONE
     *
     * @param returnConsumedCapacity A value that if set to TOTAL, the response includes
     *         ConsumedCapacity data for tables and indexes. If set to
     *         INDEXES, the response includes ConsumedCapacity
     *         for indexes. If set to NONE (the default),
     *         ConsumedCapacity is not included in the response.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnConsumedCapacity
     */
    public DeleteItemRequest withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity) {
        this.returnConsumedCapacity = returnConsumedCapacity.toString();
        return this;
    }

    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     *
     * @return A value that if set to SIZE, the response includes
     *         statistics about item collections, if any, that were modified during
     *         the operation are returned in the response. If set to
     *         NONE (the default), no statistics are returned.
     *
     * @see ReturnItemCollectionMetrics
     */
    public String getReturnItemCollectionMetrics() {
        return returnItemCollectionMetrics;
    }
    
    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     *
     * @param returnItemCollectionMetrics A value that if set to SIZE, the response includes
     *         statistics about item collections, if any, that were modified during
     *         the operation are returned in the response. If set to
     *         NONE (the default), no statistics are returned.
     *
     * @see ReturnItemCollectionMetrics
     */
    public void setReturnItemCollectionMetrics(String returnItemCollectionMetrics) {
        this.returnItemCollectionMetrics = returnItemCollectionMetrics;
    }
    
    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     *
     * @param returnItemCollectionMetrics A value that if set to SIZE, the response includes
     *         statistics about item collections, if any, that were modified during
     *         the operation are returned in the response. If set to
     *         NONE (the default), no statistics are returned.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnItemCollectionMetrics
     */
    public DeleteItemRequest withReturnItemCollectionMetrics(String returnItemCollectionMetrics) {
        this.returnItemCollectionMetrics = returnItemCollectionMetrics;
        return this;
    }

    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     *
     * @param returnItemCollectionMetrics A value that if set to SIZE, the response includes
     *         statistics about item collections, if any, that were modified during
     *         the operation are returned in the response. If set to
     *         NONE (the default), no statistics are returned.
     *
     * @see ReturnItemCollectionMetrics
     */
    public void setReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics) {
        this.returnItemCollectionMetrics = returnItemCollectionMetrics.toString();
    }
    
    /**
     * A value that if set to SIZE, the response includes
     * statistics about item collections, if any, that were modified during
     * the operation are returned in the response. If set to
     * NONE (the default), no statistics are returned.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     * 

     * Constraints:

     * Allowed Values: SIZE, NONE
     *
     * @param returnItemCollectionMetrics A value that if set to SIZE, the response includes
     *         statistics about item collections, if any, that were modified during
     *         the operation are returned in the response. If set to
     *         NONE (the default), no statistics are returned.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     *
     * @see ReturnItemCollectionMetrics
     */
    public DeleteItemRequest withReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics) {
        this.returnItemCollectionMetrics = returnItemCollectionMetrics.toString();
        return this;
    }

    /**
     * A condition that must be satisfied in order for a conditional
     * DeleteItem to succeed. 
An expression can contain any of the
     * following: 
 
 
Functions: attribute_exists |
     * attribute_not_exists | attribute_type | contains | begins_with |
     * size 
These function names are case-sensitive. 
 

     * 
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     * IN 
 
 
 Logical operators: AND | OR |
     * NOT 
 
 
For more information on condition
     * expressions, see Specifying
     * Conditions in the Amazon DynamoDB Developer Guide.
     * 
ConditionExpression replaces the legacy
     * ConditionalOperator and Expected parameters.
     *
     * @return A condition that must be satisfied in order for a conditional
     *         DeleteItem to succeed. 
An expression can contain any of the
     *         following: 
 
 
Functions: attribute_exists |
     *         attribute_not_exists | attribute_type | contains | begins_with |
     *         size 
These function names are case-sensitive. 
 

     *         
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     *         IN 
 
 
 Logical operators: AND | OR |
     *         NOT 
 
 
For more information on condition
     *         expressions, see Specifying
     *         Conditions in the Amazon DynamoDB Developer Guide.
     *         
ConditionExpression replaces the legacy
     *         ConditionalOperator and Expected parameters.
     */
    public String getConditionExpression() {
        return conditionExpression;
    }
    
    /**
     * A condition that must be satisfied in order for a conditional
     * DeleteItem to succeed. 
An expression can contain any of the
     * following: 
 
 
Functions: attribute_exists |
     * attribute_not_exists | attribute_type | contains | begins_with |
     * size 
These function names are case-sensitive. 
 

     * 
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     * IN 
 
 
 Logical operators: AND | OR |
     * NOT 
 
 
For more information on condition
     * expressions, see Specifying
     * Conditions in the Amazon DynamoDB Developer Guide.
     * 
ConditionExpression replaces the legacy
     * ConditionalOperator and Expected parameters.
     *
     * @param conditionExpression A condition that must be satisfied in order for a conditional
     *         DeleteItem to succeed. 
An expression can contain any of the
     *         following: 
 
 
Functions: attribute_exists |
     *         attribute_not_exists | attribute_type | contains | begins_with |
     *         size 
These function names are case-sensitive. 
 

     *         
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     *         IN 
 
 
 Logical operators: AND | OR |
     *         NOT 
 
 
For more information on condition
     *         expressions, see Specifying
     *         Conditions in the Amazon DynamoDB Developer Guide.
     *         
ConditionExpression replaces the legacy
     *         ConditionalOperator and Expected parameters.
     */
    public void setConditionExpression(String conditionExpression) {
        this.conditionExpression = conditionExpression;
    }
    
    /**
     * A condition that must be satisfied in order for a conditional
     * DeleteItem to succeed. 
An expression can contain any of the
     * following: 
 
 
Functions: attribute_exists |
     * attribute_not_exists | attribute_type | contains | begins_with |
     * size 
These function names are case-sensitive. 
 

     * 
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     * IN 
 
 
 Logical operators: AND | OR |
     * NOT 
 
 
For more information on condition
     * expressions, see Specifying
     * Conditions in the Amazon DynamoDB Developer Guide.
     * 
ConditionExpression replaces the legacy
     * ConditionalOperator and Expected parameters.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param conditionExpression A condition that must be satisfied in order for a conditional
     *         DeleteItem to succeed. 
An expression can contain any of the
     *         following: 
 
 
Functions: attribute_exists |
     *         attribute_not_exists | attribute_type | contains | begins_with |
     *         size 
These function names are case-sensitive. 
 

     *         
Comparison operators:  = | <> | < | > | <= | >= | BETWEEN |
     *         IN 
 
 
 Logical operators: AND | OR |
     *         NOT 
 
 
For more information on condition
     *         expressions, see Specifying
     *         Conditions in the Amazon DynamoDB Developer Guide.
     *         
ConditionExpression replaces the legacy
     *         ConditionalOperator and Expected parameters.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withConditionExpression(String conditionExpression) {
        this.conditionExpression = conditionExpression;
        return this;
    }

    /**
     * One or more substitution tokens for attribute names in an expression.
     * The following are some use cases for using
     * ExpressionAttributeNames: 
 
 
To access an attribute
     * whose name conflicts with a DynamoDB reserved word. 
 
 
To
     * create a placeholder for repeating occurrences of an attribute name in
     * an expression. 
 
 
To prevent special characters in an
     * attribute name from being misinterpreted in an expression. 
 
     * 
Use the # character in an expression to dereference an
     * attribute name. For example, consider the following attribute name:
     * 
Percentile
 
The name of this
     * attribute conflicts with a reserved word, so it cannot be used
     * directly in an expression. (For the complete list of reserved words,
     * see Reserved
     * Words in the Amazon DynamoDB Developer Guide). To work
     * around this, you could specify the following for
     * ExpressionAttributeNames:
     * 
{"#P":"Percentile"}
 
You could
     * then use this substitution in an expression, as in this example:
     * 
#P = :val
 
Tokens that begin
     * with the : character are expression attribute values,
     * which are placeholders for the actual value at runtime. 
For
     * more information on expression attribute names, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     *
     * @return One or more substitution tokens for attribute names in an expression.
     *         The following are some use cases for using
     *         ExpressionAttributeNames: 
 
 
To access an attribute
     *         whose name conflicts with a DynamoDB reserved word. 
 
 
To
     *         create a placeholder for repeating occurrences of an attribute name in
     *         an expression. 
 
 
To prevent special characters in an
     *         attribute name from being misinterpreted in an expression. 
 
     *         
Use the # character in an expression to dereference an
     *         attribute name. For example, consider the following attribute name:
     *         
Percentile
 
The name of this
     *         attribute conflicts with a reserved word, so it cannot be used
     *         directly in an expression. (For the complete list of reserved words,
     *         see Reserved
     *         Words in the Amazon DynamoDB Developer Guide). To work
     *         around this, you could specify the following for
     *         ExpressionAttributeNames:
     *         
{"#P":"Percentile"}
 
You could
     *         then use this substitution in an expression, as in this example:
     *         
#P = :val
 
Tokens that begin
     *         with the : character are expression attribute values,
     *         which are placeholders for the actual value at runtime. 
For
     *         more information on expression attribute names, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     */
    public java.util.Map getExpressionAttributeNames() {
        
        return expressionAttributeNames;
    }
    
    /**
     * One or more substitution tokens for attribute names in an expression.
     * The following are some use cases for using
     * ExpressionAttributeNames: 
 
 
To access an attribute
     * whose name conflicts with a DynamoDB reserved word. 
 
 
To
     * create a placeholder for repeating occurrences of an attribute name in
     * an expression. 
 
 
To prevent special characters in an
     * attribute name from being misinterpreted in an expression. 
 
     * 
Use the # character in an expression to dereference an
     * attribute name. For example, consider the following attribute name:
     * 
Percentile
 
The name of this
     * attribute conflicts with a reserved word, so it cannot be used
     * directly in an expression. (For the complete list of reserved words,
     * see Reserved
     * Words in the Amazon DynamoDB Developer Guide). To work
     * around this, you could specify the following for
     * ExpressionAttributeNames:
     * 
{"#P":"Percentile"}
 
You could
     * then use this substitution in an expression, as in this example:
     * 
#P = :val
 
Tokens that begin
     * with the : character are expression attribute values,
     * which are placeholders for the actual value at runtime. 
For
     * more information on expression attribute names, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     *
     * @param expressionAttributeNames One or more substitution tokens for attribute names in an expression.
     *         The following are some use cases for using
     *         ExpressionAttributeNames: 
 
 
To access an attribute
     *         whose name conflicts with a DynamoDB reserved word. 
 
 
To
     *         create a placeholder for repeating occurrences of an attribute name in
     *         an expression. 
 
 
To prevent special characters in an
     *         attribute name from being misinterpreted in an expression. 
 
     *         
Use the # character in an expression to dereference an
     *         attribute name. For example, consider the following attribute name:
     *         
Percentile
 
The name of this
     *         attribute conflicts with a reserved word, so it cannot be used
     *         directly in an expression. (For the complete list of reserved words,
     *         see Reserved
     *         Words in the Amazon DynamoDB Developer Guide). To work
     *         around this, you could specify the following for
     *         ExpressionAttributeNames:
     *         
{"#P":"Percentile"}
 
You could
     *         then use this substitution in an expression, as in this example:
     *         
#P = :val
 
Tokens that begin
     *         with the : character are expression attribute values,
     *         which are placeholders for the actual value at runtime. 
For
     *         more information on expression attribute names, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     */
    public void setExpressionAttributeNames(java.util.Map expressionAttributeNames) {
        this.expressionAttributeNames = expressionAttributeNames;
    }
    
    /**
     * One or more substitution tokens for attribute names in an expression.
     * The following are some use cases for using
     * ExpressionAttributeNames: 
 
 
To access an attribute
     * whose name conflicts with a DynamoDB reserved word. 
 
 
To
     * create a placeholder for repeating occurrences of an attribute name in
     * an expression. 
 
 
To prevent special characters in an
     * attribute name from being misinterpreted in an expression. 
 
     * 
Use the # character in an expression to dereference an
     * attribute name. For example, consider the following attribute name:
     * 
Percentile
 
The name of this
     * attribute conflicts with a reserved word, so it cannot be used
     * directly in an expression. (For the complete list of reserved words,
     * see Reserved
     * Words in the Amazon DynamoDB Developer Guide). To work
     * around this, you could specify the following for
     * ExpressionAttributeNames:
     * 
{"#P":"Percentile"}
 
You could
     * then use this substitution in an expression, as in this example:
     * 
#P = :val
 
Tokens that begin
     * with the : character are expression attribute values,
     * which are placeholders for the actual value at runtime. 
For
     * more information on expression attribute names, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param expressionAttributeNames One or more substitution tokens for attribute names in an expression.
     *         The following are some use cases for using
     *         ExpressionAttributeNames: 
 
 
To access an attribute
     *         whose name conflicts with a DynamoDB reserved word. 
 
 
To
     *         create a placeholder for repeating occurrences of an attribute name in
     *         an expression. 
 
 
To prevent special characters in an
     *         attribute name from being misinterpreted in an expression. 
 
     *         
Use the # character in an expression to dereference an
     *         attribute name. For example, consider the following attribute name:
     *         
Percentile
 
The name of this
     *         attribute conflicts with a reserved word, so it cannot be used
     *         directly in an expression. (For the complete list of reserved words,
     *         see Reserved
     *         Words in the Amazon DynamoDB Developer Guide). To work
     *         around this, you could specify the following for
     *         ExpressionAttributeNames:
     *         
{"#P":"Percentile"}
 
You could
     *         then use this substitution in an expression, as in this example:
     *         
#P = :val
 
Tokens that begin
     *         with the : character are expression attribute values,
     *         which are placeholders for the actual value at runtime. 
For
     *         more information on expression attribute names, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withExpressionAttributeNames(java.util.Map expressionAttributeNames) {
        setExpressionAttributeNames(expressionAttributeNames);
        return this;
    }

    /**
     * One or more substitution tokens for attribute names in an expression.
     * The following are some use cases for using
     * ExpressionAttributeNames: 
 
 
To access an attribute
     * whose name conflicts with a DynamoDB reserved word. 
 
 
To
     * create a placeholder for repeating occurrences of an attribute name in
     * an expression. 
 
 
To prevent special characters in an
     * attribute name from being misinterpreted in an expression. 
 
     * 
Use the # character in an expression to dereference an
     * attribute name. For example, consider the following attribute name:
     * 
Percentile
 
The name of this
     * attribute conflicts with a reserved word, so it cannot be used
     * directly in an expression. (For the complete list of reserved words,
     * see Reserved
     * Words in the Amazon DynamoDB Developer Guide). To work
     * around this, you could specify the following for
     * ExpressionAttributeNames:
     * 
{"#P":"Percentile"}
 
You could
     * then use this substitution in an expression, as in this example:
     * 
#P = :val
 
Tokens that begin
     * with the : character are expression attribute values,
     * which are placeholders for the actual value at runtime. 
For
     * more information on expression attribute names, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     * 

     * The method adds a new key-value pair into ExpressionAttributeNames
     * parameter, and returns a reference to this object so that method calls
     * can be chained together.
     *
     * @param key The key of the entry to be added into ExpressionAttributeNames.
     * @param value The corresponding value of the entry to be added into ExpressionAttributeNames.
     */
  public DeleteItemRequest addExpressionAttributeNamesEntry(String key, String value) {
    if (null == this.expressionAttributeNames) {
      this.expressionAttributeNames = new java.util.HashMap();
    }
    if (this.expressionAttributeNames.containsKey(key))
      throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
    this.expressionAttributeNames.put(key, value);
    return this;
  }

  /**
   * Removes all the entries added into ExpressionAttributeNames.
   * 

   * Returns a reference to this object so that method calls can be chained together.
   */
  public DeleteItemRequest clearExpressionAttributeNamesEntries() {
    this.expressionAttributeNames = null;
    return this;
  }
  
    /**
     * One or more values that can be substituted in an expression. 
Use
     * the : (colon) character in an expression to dereference an
     * attribute value. For example, suppose that you wanted to check whether
     * the value of the ProductStatus attribute was one of the
     * following: 
Available | Backordered | Discontinued
     * 
You would first need to specify ExpressionAttributeValues as
     * follows: 
{ ":avail":{"S":"Available"},
     * ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     * 
You could then use these values in an expression, such as this:
     * 
ProductStatus IN (:avail, :back, :disc) 
For more
     * information on expression attribute values, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     *
     * @return One or more values that can be substituted in an expression. 
Use
     *         the : (colon) character in an expression to dereference an
     *         attribute value. For example, suppose that you wanted to check whether
     *         the value of the ProductStatus attribute was one of the
     *         following: 
Available | Backordered | Discontinued
     *         
You would first need to specify ExpressionAttributeValues as
     *         follows: 
{ ":avail":{"S":"Available"},
     *         ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     *         
You could then use these values in an expression, such as this:
     *         
ProductStatus IN (:avail, :back, :disc) 
For more
     *         information on expression attribute values, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     */
    public java.util.Map getExpressionAttributeValues() {
        
        return expressionAttributeValues;
    }
    
    /**
     * One or more values that can be substituted in an expression. 
Use
     * the : (colon) character in an expression to dereference an
     * attribute value. For example, suppose that you wanted to check whether
     * the value of the ProductStatus attribute was one of the
     * following: 
Available | Backordered | Discontinued
     * 
You would first need to specify ExpressionAttributeValues as
     * follows: 
{ ":avail":{"S":"Available"},
     * ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     * 
You could then use these values in an expression, such as this:
     * 
ProductStatus IN (:avail, :back, :disc) 
For more
     * information on expression attribute values, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     *
     * @param expressionAttributeValues One or more values that can be substituted in an expression. 
Use
     *         the : (colon) character in an expression to dereference an
     *         attribute value. For example, suppose that you wanted to check whether
     *         the value of the ProductStatus attribute was one of the
     *         following: 
Available | Backordered | Discontinued
     *         
You would first need to specify ExpressionAttributeValues as
     *         follows: 
{ ":avail":{"S":"Available"},
     *         ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     *         
You could then use these values in an expression, such as this:
     *         
ProductStatus IN (:avail, :back, :disc) 
For more
     *         information on expression attribute values, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     */
    public void setExpressionAttributeValues(java.util.Map expressionAttributeValues) {
        this.expressionAttributeValues = expressionAttributeValues;
    }
    
    /**
     * One or more values that can be substituted in an expression. 
Use
     * the : (colon) character in an expression to dereference an
     * attribute value. For example, suppose that you wanted to check whether
     * the value of the ProductStatus attribute was one of the
     * following: 
Available | Backordered | Discontinued
     * 
You would first need to specify ExpressionAttributeValues as
     * follows: 
{ ":avail":{"S":"Available"},
     * ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     * 
You could then use these values in an expression, such as this:
     * 
ProductStatus IN (:avail, :back, :disc) 
For more
     * information on expression attribute values, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param expressionAttributeValues One or more values that can be substituted in an expression. 
Use
     *         the : (colon) character in an expression to dereference an
     *         attribute value. For example, suppose that you wanted to check whether
     *         the value of the ProductStatus attribute was one of the
     *         following: 
Available | Backordered | Discontinued
     *         
You would first need to specify ExpressionAttributeValues as
     *         follows: 
{ ":avail":{"S":"Available"},
     *         ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     *         
You could then use these values in an expression, such as this:
     *         
ProductStatus IN (:avail, :back, :disc) 
For more
     *         information on expression attribute values, see Using
     *         Placeholders for Attribute Names and Values in the Amazon
     *         DynamoDB Developer Guide.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public DeleteItemRequest withExpressionAttributeValues(java.util.Map expressionAttributeValues) {
        setExpressionAttributeValues(expressionAttributeValues);
        return this;
    }

    /**
     * One or more values that can be substituted in an expression. 
Use
     * the : (colon) character in an expression to dereference an
     * attribute value. For example, suppose that you wanted to check whether
     * the value of the ProductStatus attribute was one of the
     * following: 
Available | Backordered | Discontinued
     * 
You would first need to specify ExpressionAttributeValues as
     * follows: 
{ ":avail":{"S":"Available"},
     * ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
     * 
You could then use these values in an expression, such as this:
     * 
ProductStatus IN (:avail, :back, :disc) 
For more
     * information on expression attribute values, see Using
     * Placeholders for Attribute Names and Values in the Amazon
     * DynamoDB Developer Guide.
     * 

     * The method adds a new key-value pair into ExpressionAttributeValues
     * parameter, and returns a reference to this object so that method calls
     * can be chained together.
     *
     * @param key The key of the entry to be added into ExpressionAttributeValues.
     * @param value The corresponding value of the entry to be added into ExpressionAttributeValues.
     */
  public DeleteItemRequest addExpressionAttributeValuesEntry(String key, AttributeValue value) {
    if (null == this.expressionAttributeValues) {
      this.expressionAttributeValues = new java.util.HashMap();
    }
    if (this.expressionAttributeValues.containsKey(key))
      throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
    this.expressionAttributeValues.put(key, value);
    return this;
  }

  /**
   * Removes all the entries added into ExpressionAttributeValues.
   * 

   * Returns a reference to this object so that method calls can be chained together.
   */
  public DeleteItemRequest clearExpressionAttributeValuesEntries() {
    this.expressionAttributeValues = null;
    return this;
  }
  
    /**
     * Returns a string representation of this object; useful for testing and
     * debugging.
     *
     * @return A string representation of this object.
     *
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getTableName() != null) sb.append("TableName: " + getTableName() + ",");
        if (getKey() != null) sb.append("Key: " + getKey() + ",");
        if (getExpected() != null) sb.append("Expected: " + getExpected() + ",");
        if (getConditionalOperator() != null) sb.append("ConditionalOperator: " + getConditionalOperator() + ",");
        if (getReturnValues() != null) sb.append("ReturnValues: " + getReturnValues() + ",");
        if (getReturnConsumedCapacity() != null) sb.append("ReturnConsumedCapacity: " + getReturnConsumedCapacity() + ",");
        if (getReturnItemCollectionMetrics() != null) sb.append("ReturnItemCollectionMetrics: " + getReturnItemCollectionMetrics() + ",");
        if (getConditionExpression() != null) sb.append("ConditionExpression: " + getConditionExpression() + ",");
        if (getExpressionAttributeNames() != null) sb.append("ExpressionAttributeNames: " + getExpressionAttributeNames() + ",");
        if (getExpressionAttributeValues() != null) sb.append("ExpressionAttributeValues: " + getExpressionAttributeValues() );
        sb.append("}");
        return sb.toString();
    }
    
    @Override
    public int hashCode() {
        final int prime = 31;
        int hashCode = 1;
        
        hashCode = prime * hashCode + ((getTableName() == null) ? 0 : getTableName().hashCode()); 
        hashCode = prime * hashCode + ((getKey() == null) ? 0 : getKey().hashCode()); 
        hashCode = prime * hashCode + ((getExpected() == null) ? 0 : getExpected().hashCode()); 
        hashCode = prime * hashCode + ((getConditionalOperator() == null) ? 0 : getConditionalOperator().hashCode()); 
        hashCode = prime * hashCode + ((getReturnValues() == null) ? 0 : getReturnValues().hashCode()); 
        hashCode = prime * hashCode + ((getReturnConsumedCapacity() == null) ? 0 : getReturnConsumedCapacity().hashCode()); 
        hashCode = prime * hashCode + ((getReturnItemCollectionMetrics() == null) ? 0 : getReturnItemCollectionMetrics().hashCode()); 
        hashCode = prime * hashCode + ((getConditionExpression() == null) ? 0 : getConditionExpression().hashCode()); 
        hashCode = prime * hashCode + ((getExpressionAttributeNames() == null) ? 0 : getExpressionAttributeNames().hashCode()); 
        hashCode = prime * hashCode + ((getExpressionAttributeValues() == null) ? 0 : getExpressionAttributeValues().hashCode()); 
        return hashCode;
    }
    
    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;

        if (obj instanceof DeleteItemRequest == false) return false;
        DeleteItemRequest other = (DeleteItemRequest)obj;
        
        if (other.getTableName() == null ^ this.getTableName() == null) return false;
        if (other.getTableName() != null && other.getTableName().equals(this.getTableName()) == false) return false; 
        if (other.getKey() == null ^ this.getKey() == null) return false;
        if (other.getKey() != null && other.getKey().equals(this.getKey()) == false) return false; 
        if (other.getExpected() == null ^ this.getExpected() == null) return false;
        if (other.getExpected() != null && other.getExpected().equals(this.getExpected()) == false) return false; 
        if (other.getConditionalOperator() == null ^ this.getConditionalOperator() == null) return false;
        if (other.getConditionalOperator() != null && other.getConditionalOperator().equals(this.getConditionalOperator()) == false) return false; 
        if (other.getReturnValues() == null ^ this.getReturnValues() == null) return false;
        if (other.getReturnValues() != null && other.getReturnValues().equals(this.getReturnValues()) == false) return false; 
        if (other.getReturnConsumedCapacity() == null ^ this.getReturnConsumedCapacity() == null) return false;
        if (other.getReturnConsumedCapacity() != null && other.getReturnConsumedCapacity().equals(this.getReturnConsumedCapacity()) == false) return false; 
        if (other.getReturnItemCollectionMetrics() == null ^ this.getReturnItemCollectionMetrics() == null) return false;
        if (other.getReturnItemCollectionMetrics() != null && other.getReturnItemCollectionMetrics().equals(this.getReturnItemCollectionMetrics()) == false) return false; 
        if (other.getConditionExpression() == null ^ this.getConditionExpression() == null) return false;
        if (other.getConditionExpression() != null && other.getConditionExpression().equals(this.getConditionExpression()) == false) return false; 
        if (other.getExpressionAttributeNames() == null ^ this.getExpressionAttributeNames() == null) return false;
        if (other.getExpressionAttributeNames() != null && other.getExpressionAttributeNames().equals(this.getExpressionAttributeNames()) == false) return false; 
        if (other.getExpressionAttributeValues() == null ^ this.getExpressionAttributeValues() == null) return false;
        if (other.getExpressionAttributeValues() != null && other.getExpressionAttributeValues().equals(this.getExpressionAttributeValues()) == false) return false; 
        return true;
    }
    
    @Override
    public DeleteItemRequest clone() {
        
            return (DeleteItemRequest) super.clone();
    }

}