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;
  
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultProducer;
  import org.xbill.DNS.DClass;
  import org.xbill.DNS.Message;
  import org.xbill.DNS.Name;
  import org.xbill.DNS.Record;
  import org.xbill.DNS.Section;
  import org.xbill.DNS.SimpleResolver;
  import org.xbill.DNS.Type;
  
  /**
   * an endpoint to make queries against wikipedia using the short TXT query.
   * <p/>
   * See here for a reference: http://www.commandlinefu.com/commands/view/2829/query-wikipedia-via-console-over-dns
   * <p/>
   * This endpoint accepts the following header: term: a simple term to use to query wikipedia.
   */
  public class DnsWikipediaProducer extends DefaultProducer {
  
      public DnsWikipediaProducer(Endpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          SimpleResolver resolver = new SimpleResolver();
          int type = Type.TXT;
          Name name = Name.fromString(String.valueOf(exchange.getIn().getHeader(DnsConstants.TERM)) + ".wp.dg.cx", Name.root);
          Record rec = Record.newRecord(name, type, DClass.IN);
          Message query = Message.newQuery(rec);
          Message response = resolver.send(query);
          Record[] records = response.getSectionArray(Section.ANSWER);
          if (records.length > 0) {
              exchange.getIn().setBody(records[0].rdataToString());
          } else {
              exchange.getIn().setBody(null);
          }
      }
  }
  