content: /*
   * 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.apache.camel.component.dns.types;
  
  import java.io.IOException;
  
  import org.apache.camel.Converter;
  import org.xbill.DNS.DClass;
  import org.xbill.DNS.ExtendedResolver;
  import org.xbill.DNS.Message;
  import org.xbill.DNS.Name;
  import org.xbill.DNS.Record;
  import org.xbill.DNS.Resolver;
  import org.xbill.DNS.ReverseMap;
  import org.xbill.DNS.Section;
  import org.xbill.DNS.Type;
  
  /**
   * More converters for all the DNS objects used by the DNS component.
   */
  @Converter(generateLoader = true)
  public final class DnsRecordConverter {
  
      private DnsRecordConverter() {
      }
  
      /**
       * @param  ip like "192.168.1.1"
       * @return    the complete DNS record for that IP.
       */
      @Converter(allowNull = true)
      public static Record toRecord(String ip) throws IOException {
          Resolver res = new ExtendedResolver();
  
          Name name = ReverseMap.fromAddress(ip);
          int type = Type.PTR;
          int dclass = DClass.IN;
          Record rec = Record.newRecord(name, type, dclass);
          Message query = Message.newQuery(rec);
          Message response = res.send(query);
  
          Record[] answers = response.getSectionArray(Section.ANSWER);
          if (answers.length == 0) {
              return null;
          } else {
              return answers[0];
          }
      }
  
  }
  