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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 2014-2020 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.
* 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.document;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/**
* Used to specify items to be put and/or primary keys to be deleted from a
* specific table in a BatchWriteItem request.
*/
public class TableWriteItems {
private final String tableName;
private List primaryKeysToDelete;
private Collection- itemsToPut;
public TableWriteItems(String tableName) {
if (tableName == null || tableName.trim().length() == 0)
throw new IllegalArgumentException("table name must not be null or empty");
this.tableName = tableName;
}
/**
* Return the list of primary keys (of the current table) to be deleted in
* a batch write operation.
*/
public List
getPrimaryKeysToDelete() {
return primaryKeysToDelete;
}
/**
* Used to specify multiple primary keys to be deleted from the current
* table. A primary key could consist of either a hash-key or both a
* hash-key and a range-key depending on the schema of the table.
*/
public TableWriteItems withPrimaryKeysToDelete(
PrimaryKey... primaryKeysToDelete) {
if (primaryKeysToDelete == null)
this.primaryKeysToDelete = null;
else {
Set pkNameSet = null;
for (PrimaryKey pk : primaryKeysToDelete) {
if (pkNameSet == null)
pkNameSet = pk.getComponentNameSet();
else {
if (!pkNameSet.equals(pk.getComponentNameSet())) {
throw new IllegalArgumentException(
"primary key attribute names must be consistent for the specified primary keys");
}
}
}
this.primaryKeysToDelete = new ArrayList(
Arrays.asList(primaryKeysToDelete));
}
return this;
}
/**
* Used to specify multiple hash-only primary keys to be deleted from the
* current table.
*
* @param hashKeyName
* hash-only key name
* @param hashKeyValues
* a list of hash key values
*/
public TableWriteItems withHashOnlyKeysToDelete(String hashKeyName,
Object... hashKeyValues) {
if (hashKeyName == null)
throw new IllegalArgumentException();
PrimaryKey[] primaryKeys = new PrimaryKey[hashKeyValues.length];
for (int i=0; i < hashKeyValues.length; i++)
primaryKeys[i] = new PrimaryKey(hashKeyName, hashKeyValues[i]);
return withPrimaryKeysToDelete(primaryKeys);
}
/**
* Used to specify multiple hash-and-range primary keys to be deleted
* from the current table.
*
* @param hashKeyName
* hash key name
* @param rangeKeyName
* range key name
* @param alternatingHashAndRangeKeyValues
* a list of alternating hash key value and range key value
*/
public TableWriteItems withHashAndRangeKeysToDelete(
String hashKeyName, String rangeKeyName,
Object... alternatingHashAndRangeKeyValues) {
if (hashKeyName == null)
throw new IllegalArgumentException("hash key name must be specified");
if (rangeKeyName == null)
throw new IllegalArgumentException("range key name must be specified");
if (alternatingHashAndRangeKeyValues.length % 2 != 0)
throw new IllegalArgumentException("number of hash and range key values must be the same");
final int len = alternatingHashAndRangeKeyValues.length / 2;
PrimaryKey[] primaryKeys = new PrimaryKey[len];
for (int i=0; i < alternatingHashAndRangeKeyValues.length; i += 2) {
primaryKeys[i >> 1] = new PrimaryKey(
hashKeyName, alternatingHashAndRangeKeyValues[i],
rangeKeyName, alternatingHashAndRangeKeyValues[i+1]);
}
return withPrimaryKeysToDelete(primaryKeys);
}
/**
* Adds a primary key to be deleted in a batch write-item operation. A
* primary key could consist of either a hash-key or both a
* hash-key and a range-key depending on the schema of the table.
*/
public TableWriteItems addPrimaryKeyToDelete(PrimaryKey primaryKey) {
if (primaryKey != null) {
if (primaryKeysToDelete == null)
primaryKeysToDelete = new ArrayList();
checkConsistency(primaryKey);
this.primaryKeysToDelete.add(primaryKey);
}
return this;
}
private void checkConsistency(PrimaryKey primaryKey) {
if (this.primaryKeysToDelete.size() > 0) {
// use the first one as the representative
final Set nameSet = primaryKeysToDelete.get(0).getComponentNameSet();
if (!nameSet.equals(primaryKey.getComponentNameSet()))
throw new IllegalArgumentException(
"primary key must be added with consistent key attribute name(s)");
}
}
/**
* Adds a hash-only primary key to be deleted in a batch write
* operation.
*
* @param hashKeyName name of the hash key attribute name
* @param hashKeyValue name of the hash key value
* @return the current instance for method chaining purposes
*/
public TableWriteItems addHashOnlyPrimaryKeyToDelete(
String hashKeyName, Object hashKeyValue) {
this.addPrimaryKeyToDelete(new PrimaryKey(hashKeyName, hashKeyValue));
return this;
}
/**
* Adds multiple hash-only primary keys to be deleted in a batch write
* operation.
*
* @param hashKeyName name of the hash key attribute name
* @param hashKeyValues multiple hash key values
* @return the current instance for method chaining purposes
*/
public TableWriteItems addHashOnlyPrimaryKeysToDelete(String hashKeyName,
Object ... hashKeyValues) {
for (Object hashKeyValue: hashKeyValues) {
this.addPrimaryKeyToDelete(new PrimaryKey(hashKeyName, hashKeyValue));
}
return this;
}
/**
* Adds multiple hash-and-range primary keys to be deleted in a batch
* write operation.
*
* @param hashKeyName
* name of the hash key attribute name
* @param rangeKeyName
* name of the range key attribute name
* @param alternatingHashRangeKeyValues
* used to specify multiple alternating hash key and range key
* values
* @return the current instance for method chaining purposes
*/
public TableWriteItems addHashAndRangePrimaryKeysToDelete(
String hashKeyName, String rangeKeyName,
Object ... alternatingHashRangeKeyValues) {
if (alternatingHashRangeKeyValues.length % 2 != 0) {
throw new IllegalArgumentException(
"The multiple hash and range key values must alternate");
}
for (int i =0; i < alternatingHashRangeKeyValues.length; i+=2) {
Object hashKeyValue = alternatingHashRangeKeyValues[i];
Object rangeKeyValue = alternatingHashRangeKeyValues[i+1];
this.addPrimaryKeyToDelete(
new PrimaryKey()
.addComponent(hashKeyName, hashKeyValue)
.addComponent(rangeKeyName, rangeKeyValue)
);
}
return this;
}
/**
* Adds a primary key (that consists of a hash-key and a range-key) to be
* deleted in a batch write operation.
*
* @param hashKeyName hash key attribute name
* @param hashKeyValue hash key value
* @param rangeKeyName range key attribute name
* @param rangeKeyValue range key value
* @return the current instance for method chaining purposes
*/
public TableWriteItems addHashAndRangePrimaryKeyToDelete(
String hashKeyName, Object hashKeyValue,
String rangeKeyName, Object rangeKeyValue) {
this.addPrimaryKeyToDelete(
new PrimaryKey()
.addComponent(hashKeyName, hashKeyValue)
.addComponent(rangeKeyName, rangeKeyValue));
return this;
}
/**
* Used to specify the items to be put in the current table in a batch write
* operation.
*
* @return the current instance for method chaining purposes
*/
public TableWriteItems withItemsToPut(Item ... itemsToPut) {
if (itemsToPut == null)
this.itemsToPut = null;
else
this.itemsToPut = new ArrayList- (Arrays.asList(itemsToPut));
return this;
}
/**
* Used to specify the collection of items to be put in the current table in
* a batch write operation.
*
* @return the current instance for method chaining purposes
*/
public TableWriteItems withItemsToPut(Collection
- itemsToPut) {
if (itemsToPut == null)
this.itemsToPut = null;
else
this.itemsToPut = new ArrayList
- (itemsToPut);
return this;
}
/**
* Returns the collection of items to be put in the current table in
* a batch write operation.
*/
public Collection
- getItemsToPut() {
return itemsToPut == null
? null
: Collections.unmodifiableCollection(itemsToPut);
}
public String getTableName() {
return tableName;
}
/**
* Adds an item to be put to the current table in a batch write operation.
*/
public TableWriteItems addItemToPut(Item item) {
if (item != null) {
if (itemsToPut == null)
itemsToPut = new ArrayList
- ();
this.itemsToPut.add(item);
}
return this;
}
}