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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
/*
* Copyright 2011-2020 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.
* You may obtain a copy of the License at:
*
* http://aws.amazon.com/apache2.0
*
* 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.datamodeling;
import java.util.HashMap;
import java.util.Map;
import com.amazonaws.services.dynamodbv2.model.ConditionalOperator;
import com.amazonaws.services.dynamodbv2.model.ExpectedAttributeValue;
/**
* Enables adding options to a save operation.
* For example, you may want to save only if an attribute has a particular value.
* @see DynamoDBMapper#save(Object, DynamoDBSaveExpression)
*/
public class DynamoDBSaveExpression {
/** Optional expected attributes */
private Map expectedAttributes;
/**
* The logical operator on the expected value conditions of this save
* operation.
*/
private String conditionalOperator;
/**
* Gets the map of attribute names to expected attribute values to check on save.
*
* @return The map of attribute names to expected attribute value conditions to check on save
*/
public Map getExpected() {
return expectedAttributes;
}
/**
* Sets the expected condition to the map of attribute names to expected attribute values given.
*
* @param expectedAttributes
* The map of attribute names to expected attribute value conditions to check on save
*/
public void setExpected(Map expectedAttributes) {
this.expectedAttributes = expectedAttributes;
}
/**
* Sets the expected condition to the map of attribute names to expected
* attribute values given and returns a pointer to this object for
* method-chaining.
*
* @param expectedAttributes
* The map of attribute names to expected attribute value
* conditions to check on save
*/
public DynamoDBSaveExpression withExpected(Map expectedAttributes) {
setExpected(expectedAttributes);
return this;
}
/**
* Adds one entry to the expected conditions and returns a pointer to this
* object for method-chaining.
*
* @param attributeName
* The name of the attribute.
* @param expected
* The expected attribute value.
*/
public DynamoDBSaveExpression withExpectedEntry(String attributeName, ExpectedAttributeValue expected) {
if (expectedAttributes == null) {
expectedAttributes = new HashMap();
}
expectedAttributes.put(attributeName, expected);
return this;
}
/**
* Returns the logical operator on the expected value conditions of this save
* operation.
*/
public String getConditionalOperator() {
return conditionalOperator;
}
/**
* Sets the logical operator on the expected value conditions of this save
* operation.
*/
public void setConditionalOperator(String conditionalOperator) {
this.conditionalOperator = conditionalOperator;
}
/**
* Sets the logical operator on the expected value conditions of this save
* operation and returns a pointer to this object for method-chaining.
*/
public DynamoDBSaveExpression withConditionalOperator(String conditionalOperator) {
setConditionalOperator(conditionalOperator);
return this;
}
/**
* Sets the logical operator on the expected value conditions of this save
* operation.
*/
public void setConditionalOperator(ConditionalOperator conditionalOperator) {
setConditionalOperator(conditionalOperator.toString());
}
/**
* Sets the logical operator on the expected value conditions of this save
* operation and returns a pointer to this object for method-chaining.
*/
public DynamoDBSaveExpression withConditionalOperator(ConditionalOperator conditionalOperator) {
return withConditionalOperator(conditionalOperator.toString());
}
}