labs/azure-management/src/main/java/org/jclouds/azure/management/xml/ListOSImagesHandler.java

/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds licenses this file
 * to you 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.azure.management.xml;

import java.util.Set;

import org.jclouds.azure.management.domain.OSImage;
import org.jclouds.http.functions.ParseSax;
import org.jclouds.util.SaxUtils;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSet.Builder;
import com.google.inject.Inject;

/**
 * @author Adrian Cole
 */
public class ListOSImagesHandler extends ParseSax.HandlerForGeneratedRequestWithResult<Set<OSImage>> {

   private final OSImageHandler locationHandler;

   private Builder<OSImage> locations = ImmutableSet.<OSImage> builder();

   private boolean inOSImage;

   @Inject
   public ListOSImagesHandler(OSImageHandler locationHandler) {
      this.locationHandler = locationHandler;
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public Set<OSImage> getResult() {
      return locations.build();
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public void startElement(String url, String name, String qName, Attributes attributes) throws SAXException {
      if (SaxUtils.equalsOrSuffix(qName, "OSImage")) {
         inOSImage = true;
      }
      if (inOSImage) {
         locationHandler.startElement(url, name, qName, attributes);
      }
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public void endElement(String uri, String name, String qName) throws SAXException {
      if (qName.equals("OSImage")) {
         inOSImage = false;
         locations.add(locationHandler.getResult());
      } else if (inOSImage) {
         locationHandler.endElement(uri, name, qName);
      }
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public void characters(char ch[], int start, int length) {
      if (inOSImage) {
         locationHandler.characters(ch, start, length);
      }
   }

}