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.CamelException;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultProducer;
  import org.apache.camel.util.StringHelper;
  import org.xbill.DNS.DClass;
  import org.xbill.DNS.Lookup;
  import org.xbill.DNS.Type;
  
  /**
   * A producer to manage lookup operations, using the API from dnsjava.
   */
  public class DnsLookupProducer extends DefaultProducer {
  
      public DnsLookupProducer(Endpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          String dnsName = exchange.getIn().getHeader(DnsConstants.DNS_NAME, String.class);
          StringHelper.notEmpty(dnsName, "Header " + DnsConstants.DNS_NAME);
  
          Object type = exchange.getIn().getHeader(DnsConstants.DNS_TYPE);
          Integer dnsType = null;
          if (type != null) {
              dnsType = Type.value(String.valueOf(type));
          }
          Object dclass = exchange.getIn().getHeader(DnsConstants.DNS_CLASS);
          Integer dnsClass = null;
          if (dclass != null) {
              dnsClass = DClass.value(String.valueOf(dclass));
          }
  
          Lookup lookup = (dnsClass == null)
                  ? (dnsType == null ? new Lookup(dnsName) : new Lookup(dnsName, dnsType))
                  : new Lookup(dnsName, dnsType, dnsClass);
  
          lookup.run();
          if (lookup.getAnswers() != null) {
              exchange.getIn().setBody(lookup.getAnswers());
          } else {
              throw new CamelException(lookup.getErrorString());
          }
      }
  }
  