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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 2014-2021 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.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Used to specify one or multiple primary keys of a specific table, the
* attributes to be retrieved from that table, and the consistency of the read
* operation in a BatchGetItem request.
*/
public class TableKeysAndAttributes {
private final String tableName;
private List primaryKeys;
private Set attributeNames;
private boolean consistentRead;
private String projectionExpression;
private Map nameMap;
public TableKeysAndAttributes(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 included in
* a batch get-item operation.
*/
public List getPrimaryKeys() {
return primaryKeys;
}
/**
* Used to specify multiple primary keys. 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 TableKeysAndAttributes withPrimaryKeys(PrimaryKey... primaryKeys) {
if (primaryKeys == null)
this.primaryKeys = null;
else {
Set pkNameSet = null;
for (PrimaryKey pk : primaryKeys) {
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.primaryKeys = new ArrayList(Arrays.asList(primaryKeys));
}
return this;
}
/**
* Used to specify multiple hash-only primary keys.
* @param hashKeyName hash-only key name
* @param hashKeyValues a list of hash key values
*/
public TableKeysAndAttributes withHashOnlyKeys(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 withPrimaryKeys(primaryKeys);
}
/**
* Used to specify multiple hash-and-range primary keys.
*
* @param hashKeyName
* hash key name
* @param rangeKeyName
* range key name
* @param alternatingHashAndRangeKeyValues
* a list of alternating hash key value and range key value
*/
public TableKeysAndAttributes withHashAndRangeKeys(
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 withPrimaryKeys(primaryKeys);
}
/**
* Adds a primary key to be included in the batch get-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 TableKeysAndAttributes addPrimaryKey(PrimaryKey primaryKey) {
if (primaryKey != null) {
if (primaryKeys == null)
primaryKeys = new ArrayList();
checkConsistency(primaryKey);
this.primaryKeys.add(primaryKey);
}
return this;
}
private void checkConsistency(PrimaryKey primaryKey) {
if (this.primaryKeys.size() > 0) {
// use the first one as the representative
final Set nameSet = primaryKeys.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 included in the batch get-item
* 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 TableKeysAndAttributes addHashOnlyPrimaryKey(
String hashKeyName, Object hashKeyValue) {
this.addPrimaryKey(new PrimaryKey(hashKeyName, hashKeyValue));
return this;
}
/**
* Adds multiple hash-only primary keys to be included in the batch get-item
* 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 TableKeysAndAttributes addHashOnlyPrimaryKeys(String hashKeyName,
Object ... hashKeyValues) {
for (Object hashKeyValue: hashKeyValues) {
this.addPrimaryKey(new PrimaryKey(hashKeyName, hashKeyValue));
}
return this;
}
/**
* Adds multiple hash-and-range primary keys to be included in the batch
* get-item 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 TableKeysAndAttributes addHashAndRangePrimaryKeys(
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.addPrimaryKey(
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
* included in the batch get-item 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 TableKeysAndAttributes addHashAndRangePrimaryKey(
String hashKeyName, Object hashKeyValue,
String rangeKeyName, Object rangeKeyValue) {
this.addPrimaryKey(
new PrimaryKey()
.addComponent(hashKeyName, hashKeyValue)
.addComponent(rangeKeyName, rangeKeyValue));
return this;
}
/** @deprecated by {@link #withAttributeNames(String...)}. */
@Deprecated
public TableKeysAndAttributes withAttrbuteNames(String ... attributeNames) {
return withAttributeNames(attributeNames);
}
/** @deprecated by {@link #withAttributeNames(List)}. */
@Deprecated
public TableKeysAndAttributes withAttrbuteNames(List attributeNames) {
return withAttributeNames(attributeNames);
}
/**
* Used to specify the attributes to be retrieved in each item returned
* from the batch get-item operation.
*
* @param attributeNames names of the attributes to be retrieved in each
* item returned from the batch get-item operation.
* @return the current instance for method chaining purposes
*/
public TableKeysAndAttributes withAttributeNames(String ... attributeNames) {
if (attributeNames == null)
this.attributeNames = null;
else
this.attributeNames = Collections.unmodifiableSet(
new LinkedHashSet(Arrays.asList(attributeNames)));
return this;
}
public TableKeysAndAttributes withAttributeNames(List attributeNames) {
if (attributeNames == null)
this.attributeNames = null;
else
this.attributeNames = Collections.unmodifiableSet(
new LinkedHashSet(attributeNames));
return this;
}
public Set getAttributeNames() {
return attributeNames;
}
public String getTableName() {
return tableName;
}
public boolean isConsistentRead() {
return consistentRead;
}
public TableKeysAndAttributes withConsistentRead(boolean consistentRead) {
this.consistentRead = consistentRead;
return this;
}
public String getProjectionExpression() {
return projectionExpression;
}
public TableKeysAndAttributes withProjectionExpression(String projectionExpression) {
this.projectionExpression = projectionExpression;
return this;
}
public Map getNameMap() {
return nameMap;
}
public TableKeysAndAttributes withNameMap(Map nameMap) {
this.nameMap = nameMap == null
? null : Collections.unmodifiableMap(new LinkedHashMap(nameMap));
return this;
}
}