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  /*
   * Copyright 2010-2015 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.elasticmapreduce.model.transform;
 
 import static com.amazonaws.util.StringUtils.UTF8;
 import static com.amazonaws.util.StringUtils.COMMA_SEPARATOR;
 import java.io.Writer;
 import java.util.Map;
 import java.util.List;
 
List Instances Request Marshaller
 
 
     public Request<ListInstancesRequestmarshall(ListInstancesRequest listInstancesRequest) {
         if (listInstancesRequest == null) {
             throw new AmazonClientException("Invalid argument passed to marshall(...)");
         }
 
         Request<ListInstancesRequestrequest = new DefaultRequest<ListInstancesRequest>(listInstancesRequest"AmazonElasticMapReduce");
         String target = "ElasticMapReduce.ListInstances";
         request.addHeader("X-Amz-Target"target);
 
         request.setHttpMethod(.);
         request.setResourcePath("");
         
         try {
           StringWriter stringWriter = new StringWriter();
           JSONWriter jsonWriter = new JSONWriter(stringWriter);
 
           jsonWriter.object();
           
             if (listInstancesRequest.getClusterId() != null) {
                 jsonWriter.key("ClusterId").value(listInstancesRequest.getClusterId());
             }
             if (listInstancesRequest.getInstanceGroupId() != null) {
                 jsonWriter.key("InstanceGroupId").value(listInstancesRequest.getInstanceGroupId());
             }
 
             com.amazonaws.internal.ListWithAutoConstructFlag<StringinstanceGroupTypesList = (com.amazonaws.internal.ListWithAutoConstructFlag<String>)(listInstancesRequest.getInstanceGroupTypes());
             if (instanceGroupTypesList != null && !(instanceGroupTypesList.isAutoConstruct() && instanceGroupTypesList.isEmpty())) {
 
                 jsonWriter.key("InstanceGroupTypes");
                 jsonWriter.array();
 
                 for (String instanceGroupTypesListValue : instanceGroupTypesList) {
                     if (instanceGroupTypesListValue != null) {
                         jsonWriter.value(instanceGroupTypesListValue);
                     }
                 }
                 jsonWriter.endArray();
             }
             if (listInstancesRequest.getMarker() != null) {
                 jsonWriter.key("Marker").value(listInstancesRequest.getMarker());
             }
 
           jsonWriter.endObject();
 
           String snippet = stringWriter.toString();
           byte[] content = snippet.getBytes();
           request.setContent(new StringInputStream(snippet));
           request.addHeader("Content-Length", Integer.toString(content.length));
           request.addHeader("Content-Type""application/x-amz-json-1.1");
         } catch(Throwable t) {
           throw new AmazonClientException("Unable to marshall request to JSON: " + t.getMessage(), t);
         }
 
         return request;
    }
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