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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.spec;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.amazonaws.annotation.Beta;
import com.amazonaws.event.ProgressListener;
import com.amazonaws.metrics.RequestMetricCollector;
import com.amazonaws.services.dynamodbv2.document.KeyAttribute;
import com.amazonaws.services.dynamodbv2.document.PrimaryKey;
import com.amazonaws.services.dynamodbv2.document.QueryFilter;
import com.amazonaws.services.dynamodbv2.document.RangeKeyCondition;
import com.amazonaws.services.dynamodbv2.model.ConditionalOperator;
import com.amazonaws.services.dynamodbv2.model.QueryRequest;
import com.amazonaws.services.dynamodbv2.model.ReturnConsumedCapacity;
import com.amazonaws.services.dynamodbv2.model.Select;
import com.amazonaws.services.dynamodbv2.xspec.QueryExpressionSpec;
/**
* Full parameter specification for the Query API.
*/
public class QuerySpec extends AbstractCollectionSpec {
private KeyAttribute hashKey;
private RangeKeyCondition rangeKeyCondition;
private Collection queryFilters;
private Map nameMap;
private Map valueMap;
private Collection exclusiveStartKey;
public QuerySpec() {
super(new QueryRequest());
}
public KeyAttribute getHashKey() {
return hashKey;
}
public QuerySpec withHashKey(KeyAttribute hashKey) {
this.hashKey = hashKey;
return this;
}
public QuerySpec withHashKey(String hashKeyName, Object hashKeyValue) {
this.hashKey = new KeyAttribute(hashKeyName, hashKeyValue);
return this;
}
public RangeKeyCondition getRangeKeyCondition() {
return rangeKeyCondition;
}
public QuerySpec withRangeKeyCondition(RangeKeyCondition rangeKeyCondition) {
this.rangeKeyCondition = rangeKeyCondition;
return this;
}
/**
* When a key condition expression is specified, the corresponding name-map
* and value-map can optionally be specified via {@link #withNameMap(Map)}
* and {@link #withValueMap(Map)}. (Note the hash key and range key
* conditions must not be specified if a key condition expression has been
* specified.)
*/
public QuerySpec withKeyConditionExpression(String keyConditionExpression) {
getRequest().withKeyConditionExpression(keyConditionExpression);
return this;
}
public String getKeyConditionExpression() {
return getRequest().getKeyConditionExpression();
}
public QuerySpec withAttributesToGet(String... attributes) {
getRequest().withAttributesToGet(Arrays.asList(attributes));
return this;
}
public List getAttributesToGet() {
return getRequest().getAttributesToGet();
}
public QuerySpec withConditionalOperator(ConditionalOperator op) {
getRequest().withConditionalOperator(op);
return this;
}
public String getConditionalOperator() {
return getRequest().getConditionalOperator();
}
public QuerySpec withConsistentRead(boolean consistentRead) {
getRequest().setConsistentRead(consistentRead);
return this;
}
public boolean isConsistentRead() {
return getRequest().isConsistentRead();
}
public QuerySpec withQueryFilters(QueryFilter... queryFilters) {
if (queryFilters == null)
this.queryFilters = null;
else {
Set names = new LinkedHashSet();
for (QueryFilter e: queryFilters)
names.add(e.getAttribute());
if (names.size() != queryFilters.length) {
throw new IllegalArgumentException(
"attribute names must not duplicate in the list of query filters");
}
this.queryFilters = Arrays.asList(queryFilters);
}
return this;
}
public Collection getQueryFilters() {
return queryFilters;
}
/**
* When a filter expression is specified, the corresponding name-map and
* value-map can optionally be specified via {@link #withNameMap(Map)} and
* {@link #withValueMap(Map)}. (Note query filters must not be specified if
* a filter expression has been specified.)
*/
public QuerySpec withFilterExpression(String filterExpression) {
getRequest().withFilterExpression(filterExpression);
return this;
}
public String getFilterExpression() {
return getRequest().getFilterExpression();
}
/**
* When a projection expression is specified, the corresponding name-map and
* value-map can optionally be specified via {@link #withNameMap(Map)} and
* {@link #withValueMap(Map)}. (Note attributes-to-get must not be specified
* if a projection expression has been specified.)
*/
public QuerySpec withProjectionExpression(String projectionExpression) {
getRequest().withProjectionExpression(projectionExpression);
return this;
}
public String getProjectionExpression() {
return getRequest().getProjectionExpression();
}
public Map getNameMap() {
return nameMap;
}
/**
* Applicable only when an expression has been specified.
* Used to specify the actual values for the attribute-name placeholders,
* where the value in the map can either be string for simple attribute
* name, or a JSON path expression.
*/
public QuerySpec withNameMap(Map nameMap) {
if (nameMap == null)
this.nameMap = null;
else
this.nameMap = Collections.unmodifiableMap(new LinkedHashMap(nameMap));
return this;
}
public Map getValueMap() {
return valueMap;
}
/**
* Applicable only when an expression has been specified. Used to
* specify the actual values for the attribute-value placeholders.
*/
public QuerySpec withValueMap(Map valueMap) {
if (valueMap == null)
this.valueMap = null;
else
this.valueMap = Collections.unmodifiableMap(new LinkedHashMap(valueMap));
return this;
}
public String getReturnConsumedCapacity() {
return getRequest().getReturnConsumedCapacity();
}
public QuerySpec withReturnConsumedCapacity(
ReturnConsumedCapacity returnConsumedCapacity) {
getRequest().setReturnConsumedCapacity(returnConsumedCapacity);
return this;
}
public QuerySpec withScanIndexForward(boolean scanIndexForward) {
getRequest().withScanIndexForward(scanIndexForward);
return this;
}
public boolean isScanIndexForward() {
return getRequest().isScanIndexForward();
}
public QuerySpec withSelect(Select select) {
getRequest().withSelect(select);
return this;
}
public String getSelect() {
return getRequest().getSelect();
}
// Exclusive start key
public Collection getExclusiveStartKey() {
return exclusiveStartKey;
}
public QuerySpec withExclusiveStartKey(KeyAttribute... exclusiveStartKey) {
if (exclusiveStartKey == null)
this.exclusiveStartKey = null;
else
this.exclusiveStartKey = Arrays.asList(exclusiveStartKey);
return this;
}
public QuerySpec withExclusiveStartKey(PrimaryKey exclusiveStartKey) {
if (exclusiveStartKey == null)
this.exclusiveStartKey = null;
else {
this.exclusiveStartKey = exclusiveStartKey.getComponents();
}
return this;
}
public QuerySpec withExclusiveStartKey(
String hashKeyName, Object hashKeyValue) {
return withExclusiveStartKey(new KeyAttribute(hashKeyName, hashKeyValue));
}
public QuerySpec withExclusiveStartKey(
String hashKeyName, Object hashKeyValue,
String rangeKeyName, Object rangeKeyValue) {
return withExclusiveStartKey(
new KeyAttribute(hashKeyName, hashKeyValue),
new KeyAttribute(rangeKeyName, rangeKeyValue));
}
// Max result size
@Override
public QuerySpec withMaxResultSize(Integer maxResultSize) {
setMaxResultSize(maxResultSize);
return this;
}
@Override
public QuerySpec withMaxResultSize(int maxResultSize) {
setMaxResultSize(maxResultSize);
return this;
}
@Override
public QuerySpec withMaxPageSize(Integer maxPageSize) {
setMaxPageSize(maxPageSize);
return this;
}
@Override
public QuerySpec withMaxPageSize(int maxPageSize) {
setMaxPageSize(maxPageSize);
return this;
}
@Override
public QuerySpec withProgressListener(ProgressListener progressListener) {
setProgressListener(progressListener);
return this;
}
@Override
public QuerySpec withRequestMetricCollector(
RequestMetricCollector requestMetricCollector) {
setRequestMetricCollector(requestMetricCollector);
return this;
}
/**
* Convenient method to specify expressions (and the associated name map and
* value map) via {@link QueryExpressionSpec}.
*/
@Beta
public QuerySpec withExpressionSpec(QueryExpressionSpec xspec) {
return withKeyConditionExpression(xspec.getKeyConditionExpression())
.withFilterExpression(xspec.getFilterExpression())
.withProjectionExpression(xspec.getProjectionExpression())
.withNameMap(xspec.getNameMap())
.withValueMap(xspec.getValueMap())
;
}
}