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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.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.datamodeling.unmarshallers;

import java.text.ParseException;
import java.util.HashMap;
import java.util.Map;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentUnmarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

public class MapUnmarshaller extends MUnmarshaller {

    private static final MapUnmarshaller INSTANCE = new MapUnmarshaller();

    public static MapUnmarshaller instance() {
        return INSTANCE;
    }

    private final ArgumentUnmarshaller memberUnmarshaller;

    private MapUnmarshaller() {
        memberUnmarshaller = null;
    }

    public MapUnmarshaller(ArgumentUnmarshaller memberUnmarshaller) {
        if (memberUnmarshaller == null) {
            throw new NullPointerException("memberUnmarshaller");
        }
        this.memberUnmarshaller = memberUnmarshaller;
    }

    @Override
    public Object unmarshall(AttributeValue value) throws ParseException {
        Map map = value.getM();
        Map result = new HashMap();

        for (Map.Entry entry : map.entrySet()) {
            memberUnmarshaller.typeCheck(entry.getValue(), null);
            result.put(entry.getKey(),
                    memberUnmarshaller.unmarshall(entry.getValue()));
        }

        return result;
    }
}