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The AWS Java SDK for Amazon SQS module holds the client classes that are used for communicating with Amazon Simple Queue Service
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/*
 * Copyright 2010-2016 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.sqs.model.transform;

import java.util.Map;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Map.Entry;

import javax.xml.stream.events.XMLEvent;

import com.amazonaws.services.sqs.model.*;
import com.amazonaws.transform.Unmarshaller;
import com.amazonaws.transform.MapEntry;
import com.amazonaws.transform.StaxUnmarshallerContext;
import com.amazonaws.transform.SimpleTypeStaxUnmarshallers.*;

/**
 * Message StAX Unmarshaller
 */
public class MessageStaxUnmarshaller implements
        Unmarshaller {

    private static class AttributesMapEntryUnmarshaller implements
            Unmarshaller, StaxUnmarshallerContext> {

        @Override
        public Entry unmarshall(StaxUnmarshallerContext context)
                throws Exception {
            int originalDepth = context.getCurrentDepth();
            int targetDepth = originalDepth + 1;

            MapEntry entry = new MapEntry();

            while (true) {
                XMLEvent xmlEvent = context.nextEvent();
                if (xmlEvent.isEndDocument())
                    return entry;

                if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {
                    if (context.testExpression("Name", targetDepth)) {
                        entry.setKey(StringStaxUnmarshaller.getInstance()
                                .unmarshall(context));
                        continue;
                    }
                    if (context.testExpression("Value", targetDepth)) {
                        entry.setValue(StringStaxUnmarshaller.getInstance()
                                .unmarshall(context));
                        continue;
                    }
                } else if (xmlEvent.isEndElement()) {
                    if (context.getCurrentDepth() < originalDepth)
                        return entry;
                }
            }
        }

        private static AttributesMapEntryUnmarshaller instance;

        public static AttributesMapEntryUnmarshaller getInstance() {
            if (instance == null)
                instance = new AttributesMapEntryUnmarshaller();
            return instance;
        }

    }

    private static class MessageAttributesMapEntryUnmarshaller
            implements
            Unmarshaller, StaxUnmarshallerContext> {

        @Override
        public Entry unmarshall(
                StaxUnmarshallerContext context) throws Exception {
            int originalDepth = context.getCurrentDepth();
            int targetDepth = originalDepth + 1;

            MapEntry entry = new MapEntry();

            while (true) {
                XMLEvent xmlEvent = context.nextEvent();
                if (xmlEvent.isEndDocument())
                    return entry;

                if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {
                    if (context.testExpression("Name", targetDepth)) {
                        entry.setKey(StringStaxUnmarshaller.getInstance()
                                .unmarshall(context));
                        continue;
                    }
                    if (context.testExpression("Value", targetDepth)) {
                        entry.setValue(MessageAttributeValueStaxUnmarshaller
                                .getInstance().unmarshall(context));
                        continue;
                    }
                } else if (xmlEvent.isEndElement()) {
                    if (context.getCurrentDepth() < originalDepth)
                        return entry;
                }
            }
        }

        private static MessageAttributesMapEntryUnmarshaller instance;

        public static MessageAttributesMapEntryUnmarshaller getInstance() {
            if (instance == null)
                instance = new MessageAttributesMapEntryUnmarshaller();
            return instance;
        }

    }

    public Message unmarshall(StaxUnmarshallerContext context) throws Exception {
        Message message = new Message();
        int originalDepth = context.getCurrentDepth();
        int targetDepth = originalDepth + 1;

        if (context.isStartOfDocument())
            targetDepth += 1;

        while (true) {
            XMLEvent xmlEvent = context.nextEvent();
            if (xmlEvent.isEndDocument())
                return message;

            if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {

                if (context.testExpression("MessageId", targetDepth)) {
                    message.setMessageId(StringStaxUnmarshaller.getInstance()
                            .unmarshall(context));
                    continue;
                }

                if (context.testExpression("ReceiptHandle", targetDepth)) {
                    message.setReceiptHandle(StringStaxUnmarshaller
                            .getInstance().unmarshall(context));
                    continue;
                }

                if (context.testExpression("MD5OfBody", targetDepth)) {
                    message.setMD5OfBody(StringStaxUnmarshaller.getInstance()
                            .unmarshall(context));
                    continue;
                }

                if (context.testExpression("Body", targetDepth)) {
                    message.setBody(StringStaxUnmarshaller.getInstance()
                            .unmarshall(context));
                    continue;
                }

                if (context.testExpression("Attribute", targetDepth)) {
                    Entry entry = AttributesMapEntryUnmarshaller
                            .getInstance().unmarshall(context);
                    message.addAttributesEntry(entry.getKey(), entry.getValue());
                    continue;
                }

                if (context.testExpression("MD5OfMessageAttributes",
                        targetDepth)) {
                    message.setMD5OfMessageAttributes(StringStaxUnmarshaller
                            .getInstance().unmarshall(context));
                    continue;
                }

                if (context.testExpression("MessageAttribute", targetDepth)) {
                    Entry entry = MessageAttributesMapEntryUnmarshaller
                            .getInstance().unmarshall(context);
                    message.addMessageAttributesEntry(entry.getKey(),
                            entry.getValue());
                    continue;
                }

            } else if (xmlEvent.isEndElement()) {
                if (context.getCurrentDepth() < originalDepth) {
                    return message;
                }
            }
        }
    }

    private static MessageStaxUnmarshaller instance;

    public static MessageStaxUnmarshaller getInstance() {
        if (instance == null)
            instance = new MessageStaxUnmarshaller();
        return instance;
    }
}