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The Amazon Web Services 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 2010-2014 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.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.*;

/**
 * Get Queue Attributes Result StAX Unmarshaller
 */
public class GetQueueAttributesResultStaxUnmarshaller 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;
        }

    }

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

        if (context.isStartOfDocument()) targetDepth += 2;

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

            if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {
                if (context.testExpression("Attribute", targetDepth)) {
                    Entry entry = AttributesMapEntryUnmarshaller.getInstance().unmarshall(context);
                    getQueueAttributesResult.getAttributes().put(entry.getKey(), entry.getValue());
                    continue;
                }
            } else if (xmlEvent.isEndElement()) {
                if (context.getCurrentDepth() < originalDepth) {
                    return getQueueAttributesResult;
                }
            }
        }
    }

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