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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 2014-2018 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.internal;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.document.ItemCollection;
import com.amazonaws.services.dynamodbv2.document.KeyAttribute;
import com.amazonaws.services.dynamodbv2.document.KeyConditions;
import com.amazonaws.services.dynamodbv2.document.QueryFilter;
import com.amazonaws.services.dynamodbv2.document.QueryOutcome;
import com.amazonaws.services.dynamodbv2.document.RangeKeyCondition;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.document.api.QueryApi;
import com.amazonaws.services.dynamodbv2.document.spec.QuerySpec;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.ComparisonOperator;
import com.amazonaws.services.dynamodbv2.model.Condition;
import com.amazonaws.services.dynamodbv2.model.QueryRequest;
import java.util.Collection;
import java.util.Map;
/**
* The implementation for QueryApi of a table.
*/
public class QueryImpl extends AbstractImpl implements QueryApi {
public QueryImpl(AmazonDynamoDB client, Table table) {
super(client, table);
}
@Override
public ItemCollection query(String hashKeyName, Object hashKey) {
return doQuery(new QuerySpec()
.withHashKey(new KeyAttribute(hashKeyName, hashKey)));
}
@Override
public ItemCollection query(KeyAttribute hashKey) {
return doQuery(new QuerySpec().withHashKey(hashKey));
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition) {
return doQuery(new QuerySpec().withHashKey(hashKey)
.withRangeKeyCondition(rangeKeyCondition));
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, QueryFilter... queryFilters) {
return doQuery(new QuerySpec().withHashKey(hashKey)
.withRangeKeyCondition(rangeKeyCondition)
.withQueryFilters(queryFilters));
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, String filterExpression,
Map nameMap, Map valueMap) {
return doQuery(new QuerySpec().withHashKey(hashKey)
.withRangeKeyCondition(rangeKeyCondition)
.withFilterExpression(filterExpression)
.withNameMap(nameMap)
.withValueMap(valueMap));
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, String filterExpression,
String projectionExpression, Map nameMap,
Map valueMap) {
return doQuery(new QuerySpec().withHashKey(hashKey)
.withRangeKeyCondition(rangeKeyCondition)
.withFilterExpression(filterExpression)
.withProjectionExpression(projectionExpression)
.withNameMap(nameMap)
.withValueMap(valueMap));
}
@Override
public ItemCollection query(QuerySpec spec) {
return doQuery(spec);
}
protected ItemCollection doQuery(QuerySpec spec) {
// set the table name
String tableName = getTable().getTableName();
QueryRequest req = spec.getRequest().withTableName(tableName);
// hash key
final KeyAttribute hashKey = spec.getHashKey();
if (hashKey != null) {
addHashKeyCondition(req, hashKey);
}
// range key condition
RangeKeyCondition rangeKeyCond = spec.getRangeKeyCondition();
if (rangeKeyCond != null) {
addRangeKeyCondition(req, rangeKeyCond);
}
// query filters;
Collection filters = spec.getQueryFilters();
if (filters != null) {
req.setQueryFilter(InternalUtils.toAttributeConditionMap(filters));
}
// set up the start key, if any
Collection startKey = spec.getExclusiveStartKey();
if (startKey != null)
req.setExclusiveStartKey(InternalUtils.toAttributeValueMap(startKey));
// set up the value map, if any (when expression API is used)
final Map attrValMap = InternalUtils.fromSimpleMap(spec.getValueMap());
// set up expressions, if any
req.withExpressionAttributeNames(spec.getNameMap())
.withExpressionAttributeValues(attrValMap)
;
return new QueryCollection(getClient(), spec);
}
private void addHashKeyCondition(QueryRequest req, KeyAttribute hashKey) {
addKeyCondition(req, hashKey.getName(), ComparisonOperator.EQ, InternalUtils.toAttributeValue(hashKey.getValue()));
}
private void addRangeKeyCondition(QueryRequest req, RangeKeyCondition rangeKeyCond) {
KeyConditions keyCond = rangeKeyCond.getKeyCondition();
if (keyCond == null) {
throw new IllegalArgumentException("key condition not specified in range key condition");
}
Object[] values = rangeKeyCond.getValues();
if (values == null) {
throw new IllegalArgumentException("key condition values not specified in range key condition");
}
addKeyCondition(req, rangeKeyCond.getAttrName(), keyCond.toComparisonOperator(), InternalUtils.toAttributeValues(values));
}
private void addKeyCondition(QueryRequest req, String keyName, ComparisonOperator comparison, AttributeValue... values) {
Map currentConditions = req.getKeyConditions();
Condition currentCondition = currentConditions == null ? null : currentConditions.get(keyName);
Condition newCondition = new Condition().withComparisonOperator(comparison)
.withAttributeValueList(values);
// If there's already a condition on the key in the item, make sure it's not any different than the condition they
// specified in the query spec
if (currentCondition == null) {
req.addKeyConditionsEntry(keyName, newCondition);
} else if (!currentCondition.equals(newCondition)) {
throw new IllegalArgumentException("a different condition was specified for '" + keyName + "' in the query spec " +
"and the query request");
}
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition) {
return query(new KeyAttribute(hashKeyName, hashKeyValue), rangeKeyCondition);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
QueryFilter... queryFilters) {
return query(new KeyAttribute(hashKeyName, hashKeyValue),
rangeKeyCondition, queryFilters);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
String filterExpression, Map nameMap,
Map valueMap) {
return query(new KeyAttribute(hashKeyName, hashKeyValue),
rangeKeyCondition, filterExpression, nameMap, valueMap);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
String filterExpression, String projectionExpression,
Map nameMap, Map valueMap) {
return query(new KeyAttribute(hashKeyName, hashKeyValue),
rangeKeyCondition, filterExpression, projectionExpression,
nameMap, valueMap);
}
}