providers/trmk-ecloud/src/main/java/org/jclouds/trmk/ecloud/xml/TagNameToUsageCountHandler.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.trmk.ecloud.xml;

import static org.jclouds.util.SaxUtils.currentOrNull;
import static org.jclouds.util.SaxUtils.equalsOrSuffix;

import java.util.Map;

import org.jclouds.http.functions.ParseSax;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;

/**
 * @author Adrian Cole
 */
public class TagNameToUsageCountHandler extends ParseSax.HandlerWithResult<Map<String, Integer>> {
   protected StringBuilder currentText = new StringBuilder();

   private Builder<String, Integer> builder = ImmutableMap.builder();
   private String name;

   public Map<String, Integer> getResult() {
      try {
         return builder.build();
      } finally {
         builder = ImmutableMap.<String, Integer> builder();
      }
   }

   @Override
   public void endElement(String uri, String localName, String qName) {
      if (equalsOrSuffix(qName, "Name")) {
         name = currentOrNull(currentText);
      } else if (equalsOrSuffix(qName, "UsageCount")) {
         builder.put(name, Integer.valueOf(currentOrNull(currentText)));
      }
      currentText = new StringBuilder();
   }

   public void characters(char ch[], int start, int length) {
      currentText.append(ch, start, length);
   }
}