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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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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;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.amazonaws.services.dynamodbv2.document.api.BatchGetItemApi;
import com.amazonaws.services.dynamodbv2.document.internal.InternalUtils;
import com.amazonaws.services.dynamodbv2.document.spec.BatchGetItemSpec;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.BatchGetItemResult;
import com.amazonaws.services.dynamodbv2.model.KeysAndAttributes;

/**
 * The outcome of a batch get-item operation from DynamoDB.
 */
public class BatchGetItemOutcome {
    private final BatchGetItemResult result;

    /**
     * @param result the low-level result; must not be null
     */
    public BatchGetItemOutcome(BatchGetItemResult result) {
        if (result == null)
            throw new IllegalArgumentException();
        this.result = result;
    }

    /**
     * Returns a map of table name to the list of retrieved items 
     */
    public Map> getTableItems() {
        Map>> res = 
            result.getResponses();
        Map> map = new LinkedHashMap>(res.size());
        for (Map.Entry>> e 
                : res.entrySet()) {
            String tableName = e.getKey();
            List> items = e.getValue();
            map.put(tableName, InternalUtils.toItemList(items));
        }
        return map;
    }

    /**
     * Convenient method to return the low-level unprocessed keys.
     * 
     * @see BatchGetItemApi#batchGetItemUnprocessed(Map)
     * @see BatchGetItemApi#batchGetItemUnprocessed(com.amazonaws.services.dynamodbv2.model.ReturnConsumedCapacity,
     *      Map)
     * @see BatchGetItemSpec#withUnprocessedKeys(Map)
     */
    public Map getUnprocessedKeys() {
        return result.getUnprocessedKeys();
    }

    /**
     * Returns a non-null low-level result returned from the server side.
     */
    public BatchGetItemResult getBatchGetItemResult() {
        return result;
    }

    @Override
    public String toString() {
        return String.valueOf(result);
    }
}