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/*
* Copyright 2011-2016 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;
/**
*
* Represents a single element of a key schema. A key schema specifies
* the attributes that make up the primary key of a table, or the key attributes
* of an index.
*
*
* A KeySchemaElement represents exactly one attribute of the primary
* key. For example, a simple primary key would be represented by one
* KeySchemaElement (for the partition key). A composite primary key
* would require one KeySchemaElement for the partition key, and another
* KeySchemaElement for the sort key.
*
*
* A KeySchemaElement must be a scalar, top-level attribute (not a nested
* attribute). The data type must be one of String, Number, or Binary. The
* attribute cannot be nested within a List or a Map.
*
*/
public class KeySchemaElement implements Serializable, Cloneable {
/**
*
* The name of a key attribute.
*
*/
private String attributeName;
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*/
private String keyType;
/**
* Default constructor for KeySchemaElement object. Callers should use the
* setter or fluent setter (with...) methods to initialize the object after
* creating it.
*/
public KeySchemaElement() {
}
/**
* Constructs a new KeySchemaElement object. Callers should use the setter
* or fluent setter (with...) methods to initialize any additional object
* members.
*
* @param attributeName
* The name of a key attribute.
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
*/
public KeySchemaElement(String attributeName, String keyType) {
setAttributeName(attributeName);
setKeyType(keyType);
}
/**
* Constructs a new KeySchemaElement object. Callers should use the setter
* or fluent setter (with...) methods to initialize any additional object
* members.
*
* @param attributeName
* The name of a key attribute.
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
*/
public KeySchemaElement(String attributeName, KeyType keyType) {
setAttributeName(attributeName);
setKeyType(keyType.toString());
}
/**
*
* The name of a key attribute.
*
*
* @param attributeName
* The name of a key attribute.
*/
public void setAttributeName(String attributeName) {
this.attributeName = attributeName;
}
/**
*
* The name of a key attribute.
*
*
* @return The name of a key attribute.
*/
public String getAttributeName() {
return this.attributeName;
}
/**
*
* The name of a key attribute.
*
*
* @param attributeName
* The name of a key attribute.
* @return Returns a reference to this object so that method calls can be
* chained together.
*/
public KeySchemaElement withAttributeName(String attributeName) {
setAttributeName(attributeName);
return this;
}
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
* @see KeyType
*/
public void setKeyType(String keyType) {
this.keyType = keyType;
}
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*
* @return The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data
* items across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically
* close together, in sorted order by the sort key value.
*
* @see KeyType
*/
public String getKeyType() {
return this.keyType;
}
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
* @return Returns a reference to this object so that method calls can be
* chained together.
* @see KeyType
*/
public KeySchemaElement withKeyType(String keyType) {
setKeyType(keyType);
return this;
}
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
* @see KeyType
*/
public void setKeyType(KeyType keyType) {
this.keyType = keyType.toString();
}
/**
*
* The role that this key attribute will assume:
*
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash attribute.
* The term "hash attribute" derives from DynamoDB' usage of an internal
* hash function to evenly distribute data items across partitions, based on
* their partition key values.
*
*
* The sort key of an item is also known as its range attribute. The
* term "range attribute" derives from the way DynamoDB stores items with
* the same partition key physically close together, in sorted order by the
* sort key value.
*
*
*
* @param keyType
* The role that this key attribute will assume:
*
* -
*
* HASH - partition key
*
*
* -
*
* RANGE - sort key
*
*
*
*
*
* The partition key of an item is also known as its hash
* attribute. The term "hash attribute" derives from DynamoDB'
* usage of an internal hash function to evenly distribute data items
* across partitions, based on their partition key values.
*
*
* The sort key of an item is also known as its range
* attribute. The term "range attribute" derives from the way
* DynamoDB stores items with the same partition key physically close
* together, in sorted order by the sort key value.
*
* @return Returns a reference to this object so that method calls can be
* chained together.
* @see KeyType
*/
public KeySchemaElement withKeyType(KeyType keyType) {
setKeyType(keyType);
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 (getAttributeName() != null)
sb.append("AttributeName: " + getAttributeName() + ",");
if (getKeyType() != null)
sb.append("KeyType: " + getKeyType());
sb.append("}");
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (obj instanceof KeySchemaElement == false)
return false;
KeySchemaElement other = (KeySchemaElement) obj;
if (other.getAttributeName() == null ^ this.getAttributeName() == null)
return false;
if (other.getAttributeName() != null
&& other.getAttributeName().equals(this.getAttributeName()) == false)
return false;
if (other.getKeyType() == null ^ this.getKeyType() == null)
return false;
if (other.getKeyType() != null
&& other.getKeyType().equals(this.getKeyType()) == false)
return false;
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int hashCode = 1;
hashCode = prime
* hashCode
+ ((getAttributeName() == null) ? 0 : getAttributeName()
.hashCode());
hashCode = prime * hashCode
+ ((getKeyType() == null) ? 0 : getKeyType().hashCode());
return hashCode;
}
@Override
public KeySchemaElement clone() {
try {
return (KeySchemaElement) super.clone();
} catch (CloneNotSupportedException e) {
throw new IllegalStateException(
"Got a CloneNotSupportedException from Object.clone() "
+ "even though we're Cloneable!", e);
}
}
}