/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.ovf.xml;

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

import javax.inject.Provider;

import org.jclouds.http.functions.ParseSax;
import org.jclouds.ovf.Section;
import org.jclouds.ovf.Section.Builder;

public class SectionHandler<T extends Section<T>, B extends Section.Builder<T>> extends ParseSax.HandlerWithResult<T> {
   @SuppressWarnings("unchecked")
   public static SectionHandler create() {
      return new SectionHandler(new Provider<Section.Builder>() {

         @Override
         public Builder get() {
            return new Section.Builder();
         }

      });
   }

   protected final Provider<? extends Section.Builder<T>> builderProvider;
   protected StringBuilder currentText = new StringBuilder();
   protected B builder;

   public SectionHandler(Provider<B> builderProvider) {
      this.builderProvider = builderProvider;
      this.builder = builderProvider.get();
   }

   @SuppressWarnings("unchecked")
   public T getResult() {
      try {
         return (T) builder.build();
      } finally {
         builder = (B) builderProvider.get();
      }
   }

   @Override
   public void endElement(String uri, String localName, String qName) {
      if (equalsOrSuffix(qName, "Info")) {
         builder.info(currentOrNull(currentText));
      }
      currentText.setLength(0);
   }

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