View Javadoc

1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  
21  package org.apache.directory.server.dns.io.encoder;
22  
23  
24  import org.apache.directory.server.dns.messages.ResourceRecord;
25  import org.apache.directory.server.dns.store.DnsAttribute;
26  import org.apache.mina.common.ByteBuffer;
27  
28  
29  /**
30   * 3.3.9. MX RDATA format
31   * 
32   *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
33   *     |                  PREFERENCE                   |
34   *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
35   *     /                   EXCHANGE                    /
36   *     /                                               /
37   *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
38   * 
39   * where:
40   * 
41   * PREFERENCE      A 16 bit integer which specifies the preference given to
42   *                 this RR among others at the same owner.  Lower values
43   *                 are preferred.
44   * 
45   * EXCHANGE        A <domain-name> which specifies a host willing to act as
46   *                 a mail exchange for the owner name.
47   * 
48   * MX records cause type A additional section processing for the host
49   * specified by EXCHANGE.  The use of MX RRs is explained in detail in
50   * [RFC-974].
51   * 
52   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
53   * @version $Rev: 507387 $, $Date: 2007-02-14 05:54:05 +0100 (Mi, 14 Feb 2007) $
54   */
55  public class MailExchangeRecordEncoder extends ResourceRecordEncoder
56  {
57      protected void putResourceRecordData( ByteBuffer byteBuffer, ResourceRecord record )
58      {
59          byteBuffer.putShort( Short.parseShort( record.get( DnsAttribute.MX_PREFERENCE ) ) );
60          putDomainName( byteBuffer, record.get( DnsAttribute.DOMAIN_NAME ) );
61      }
62  }