/*
 * 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.aws.ec2.xml;

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

import javax.inject.Inject;

import org.jclouds.aws.ec2.domain.VPC;
import org.jclouds.ec2.xml.TagSetHandler;
import org.jclouds.http.functions.ParseSax;
import org.xml.sax.Attributes;

/**
 * @see <a href="http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_Vpc.html" >xml</a>
 */
public class VPCHandler extends ParseSax.HandlerForGeneratedRequestWithResult<VPC> {
   private StringBuilder currentText = new StringBuilder();
   private VPC.Builder builder = VPC.builder();
   private final TagSetHandler tagSetHandler;
   private boolean inTagSet;

   @Inject
   public VPCHandler(TagSetHandler tagSetHandler) {
      this.tagSetHandler = tagSetHandler;
   }

   @Override
   public VPC getResult() {
      try {
         return builder.build();
      } finally {
         builder = VPC.builder();
      }
   }

   @Override
   public void startElement(String uri, String name, String qName, Attributes attrs) {
      if (equalsOrSuffix(qName, "tagSet")) {
         inTagSet = true;
      }
      if (inTagSet) {
         tagSetHandler.startElement(uri, name, qName, attrs);
      }
   }

   @Override
   public void endElement(String uri, String name, String qName) {
      if (equalsOrSuffix(qName, "tagSet")) {
         inTagSet = false;
         builder.tags(tagSetHandler.getResult());
      } else if (inTagSet) {
         tagSetHandler.endElement(uri, name, qName);
      } else if (equalsOrSuffix(qName, "dhcpOptionsId")) {
         builder.dhcpOptionsId(currentOrNull(currentText));
      } else if (equalsOrSuffix(qName, "state")) {
         builder.state(VPC.State.fromValue(currentOrNull(currentText)));
      } else if (equalsOrSuffix(qName, "vpcId")) {
         builder.id(currentOrNull(currentText));
      } else if (equalsOrSuffix(qName, "cidrBlock")) {
         builder.cidrBlock(currentOrNull(currentText));
      } else if (equalsOrSuffix(qName, "instanceTenancy")) {
         builder.instanceTenancy(VPC.InstanceTenancy.fromValue(currentOrNull(currentText)));
      } else if (equalsOrSuffix(qName, "isDefault")) {
         builder.isDefault(Boolean.parseBoolean(currentText.toString().trim()));
      }
      currentText.setLength(0);
   }

   @Override
   public void characters(char ch[], int start, int length) {
      if (inTagSet) {
         tagSetHandler.characters(ch, start, length);
      } else {
         currentText.append(ch, start, length);
      }
   }
}