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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

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/*
 * Copyright 2014-2016 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.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.Map;
import java.util.Set;

import com.amazonaws.event.ProgressListener;
import com.amazonaws.metrics.RequestMetricCollector;
import com.amazonaws.services.dynamodbv2.document.TableKeysAndAttributes;
import com.amazonaws.services.dynamodbv2.model.BatchGetItemRequest;
import com.amazonaws.services.dynamodbv2.model.KeysAndAttributes;
import com.amazonaws.services.dynamodbv2.model.ReturnConsumedCapacity;

/**
 * Full parameter specification for the BatchGetItem API.
 */
public class BatchGetItemSpec extends AbstractSpec {
    private Collection tableKeyAndAttributes;
    private Map unprocessedKeys;

    public BatchGetItemSpec() {
        super(new BatchGetItemRequest());
    }

    public Collection getTableKeysAndAttributes() {
        return tableKeyAndAttributes;
    }

    public BatchGetItemSpec withTableKeyAndAttributes(
            TableKeysAndAttributes ... tableKeyAndAttributes) {
        if (tableKeyAndAttributes == null)
            this.tableKeyAndAttributes = null;
        else {
            Set names = new LinkedHashSet();
            for (TableKeysAndAttributes e: tableKeyAndAttributes)
                names.add(e.getTableName());
            if (names.size() != tableKeyAndAttributes.length) {
                throw new IllegalArgumentException(
                    "table names must not duplicate in the list of TableKeysAndAttributes");
            }
            this.tableKeyAndAttributes = Arrays.asList(tableKeyAndAttributes);
        }
        return this;
    }


    public String getReturnConsumedCapacity() {
        return getRequest().getReturnConsumedCapacity();
    }


    public BatchGetItemSpec withReturnConsumedCapacity(ReturnConsumedCapacity capacity) {
        getRequest().withReturnConsumedCapacity(capacity);
        return this;
    }

    @Override
    public BatchGetItemSpec withProgressListener(ProgressListener progressListener) {
        setProgressListener(progressListener);
        return this;
    }

    @Override
    public BatchGetItemSpec withRequestMetricCollector(
            RequestMetricCollector requestMetricCollector) {
        setRequestMetricCollector(requestMetricCollector);
        return this;
    }

    public Map getUnprocessedKeys() {
        return unprocessedKeys;
    }

    public BatchGetItemSpec withUnprocessedKeys(
            Map unprocessedKeys) {
        this.unprocessedKeys = Collections.unmodifiableMap(
                new LinkedHashMap(unprocessedKeys));
        return this;
    }
}