/**
    *
    * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
    *
    * ====================================================================
    * 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://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License 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 org.jclouds.aws.ec2.xml;
  
  import javax.annotation.Resource;
  import javax.inject.Inject;
  
  import org.jclouds.aws.ec2.domain.LaunchSpecification;
  import org.jclouds.aws.ec2.domain.LaunchSpecification.Builder;
  import org.jclouds.date.DateService;
  import org.jclouds.ec2.domain.BlockDeviceMapping;
  import org.jclouds.http.functions.ParseSax.HandlerForGeneratedRequestWithResult;
  import org.jclouds.location.Region;
  import org.jclouds.logging.Logger;
  import org.xml.sax.Attributes;
  
  /**
   * 
   * @author Adrian Cole
   */
  public class LaunchSpecificationHandler extends HandlerForGeneratedRequestWithResult<LaunchSpecification> {
  
     @Resource
     protected Logger logger = Logger.NULL;
  
     protected final DateService dateService;
     protected final String defaultRegion;
     protected final Builder builder;
     protected final BlockDeviceMapping.Builder blockDeviceMappingBuilder;
  
     @Inject
     public LaunchSpecificationHandler(DateService dateService, @Region String defaultRegion,
           LaunchSpecification.Builder builder, BlockDeviceMapping.Builder blockDeviceMappingBuilder) {
        this.dateService = dateService;
        this.defaultRegion = defaultRegion;
        this.builder = builder;
        this.blockDeviceMappingBuilder = blockDeviceMappingBuilder;
     }
  
     protected String currentOrNull() {
        String returnVal = currentText.toString().trim();
        return returnVal.equals("") ? null : returnVal;
     }
  
     protected StringBuilder currentText = new StringBuilder();
  
     private boolean inBlockDeviceMapping;
  
     public void startElement(String uri, String name, String qName, Attributes attrs) {
        if (qName.equals("blockDeviceMapping")) {
           inBlockDeviceMapping = true;
        }
     }
  
     public void endElement(String uri, String name, String qName) {
        if (qName.equals("blockDeviceMapping")) {
           inBlockDeviceMapping = false;
        } else if (qName.equals("item") && inBlockDeviceMapping) {
           try {
              builder.blockDeviceMapping(blockDeviceMappingBuilder.build());
           } finally {
              blockDeviceMappingBuilder.clear();
           }
        } else if (qName.equals("deviceName")) {
           blockDeviceMappingBuilder.deviceName(currentOrNull());
        } else if (qName.equals("virtualName")) {
           blockDeviceMappingBuilder.virtualName(currentOrNull());
        } else if (qName.equals("snapshotId")) {
           blockDeviceMappingBuilder.snapshotId(currentOrNull());
        } else if (qName.equals("volumeSize")) {
           String volumeSize = currentOrNull();
           if (volumeSize != null)
              blockDeviceMappingBuilder.sizeInGib(Integer.parseInt(volumeSize));
        } else if (qName.equals("noDevice")) {
           String noDevice = currentOrNull();
           if (noDevice != null)
              blockDeviceMappingBuilder.noDevice(Boolean.parseBoolean(noDevice));
        } else if (qName.equals("deleteOnTermination")) {
           String deleteOnTermination = currentOrNull();
           if (deleteOnTermination != null)
              blockDeviceMappingBuilder.deleteOnTermination(Boolean.parseBoolean(deleteOnTermination));
        } else if (qName.equals("groupId")) {
           builder.groupId(currentOrNull());
       } else if (qName.equals("imageId")) {
          builder.imageId(currentOrNull());
       } else if (qName.equals("instanceType")) {
          builder.instanceType(currentOrNull());
       } else if (qName.equals("kernelId")) {
          builder.kernelId(currentOrNull());
       } else if (qName.equals("keyName")) {
          builder.keyName(currentOrNull());
       } else if (qName.equals("availabilityZone")) {
          builder.availabilityZone(currentOrNull());
       } else if (qName.equals("ramdiskId")) {
          builder.ramdiskId(currentOrNull());
       } else if (qName.equals("enabled")) {
          String monitoringEnabled = currentOrNull();
          if (monitoringEnabled != null)
             builder.monitoringEnabled(new Boolean(monitoringEnabled));
       }
       currentText = new StringBuilder();
    }
 
    public void characters(char ch[], int start, int length) {
       currentText.append(ch, start, length);
    }
 
    @Override
    public LaunchSpecification getResult() {
       try {
          return builder.build();
       } finally {
          builder.clear();
       }
    }
 
 }