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The AWS Java SDK for Auto Scaling module holds the client classes that are used for communicating with Auto Scaling 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.autoscaling.model.transform;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.DefaultRequest;
import com.amazonaws.http.HttpMethodName;
import com.amazonaws.services.autoscaling.model.*;
import com.amazonaws.transform.Marshaller;
import com.amazonaws.util.StringUtils;
import com.amazonaws.util.IdempotentUtils;

/**
 * DetachInstancesRequest Marshaller
 */

public class DetachInstancesRequestMarshaller implements
        Marshaller, DetachInstancesRequest> {

    public Request marshall(
            DetachInstancesRequest detachInstancesRequest) {

        if (detachInstancesRequest == null) {
            throw new AmazonClientException(
                    "Invalid argument passed to marshall(...)");
        }

        Request request = new DefaultRequest(
                detachInstancesRequest, "AmazonAutoScaling");
        request.addParameter("Action", "DetachInstances");
        request.addParameter("Version", "2011-01-01");
        request.setHttpMethod(HttpMethodName.POST);

        com.amazonaws.internal.SdkInternalList instanceIdsList = (com.amazonaws.internal.SdkInternalList) detachInstancesRequest
                .getInstanceIds();
        if (!instanceIdsList.isEmpty() || !instanceIdsList.isAutoConstruct()) {
            int instanceIdsListIndex = 1;

            for (String instanceIdsListValue : instanceIdsList) {
                if (instanceIdsListValue != null) {
                    request.addParameter("InstanceIds.member."
                            + instanceIdsListIndex,
                            StringUtils.fromString(instanceIdsListValue));
                }
                instanceIdsListIndex++;
            }
        }

        if (detachInstancesRequest.getAutoScalingGroupName() != null) {
            request.addParameter("AutoScalingGroupName", StringUtils
                    .fromString(detachInstancesRequest
                            .getAutoScalingGroupName()));
        }

        if (detachInstancesRequest.getShouldDecrementDesiredCapacity() != null) {
            request.addParameter("ShouldDecrementDesiredCapacity", StringUtils
                    .fromBoolean(detachInstancesRequest
                            .getShouldDecrementDesiredCapacity()));
        }

        return request;
    }

}