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.decoder;
22
23
24 import java.io.IOException;
25 import java.util.HashMap;
26 import java.util.Map;
27
28 import org.apache.directory.server.dns.store.DnsAttribute;
29 import org.apache.mina.common.ByteBuffer;
30
31
32 /**
33 * A decoder for MX records. MX records are encoded as per RFC-1035:
34 *
35 * <pre>
36 * 3.3.9. MX RDATA format
37 *
38 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
39 * | PREFERENCE |
40 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
41 * / EXCHANGE /
42 * / /
43 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
44 *
45 * where:
46 *
47 * PREFERENCE
48 * A 16 bit integer which specifies the preference given to this RR among
49 * others at the same owner. Lower values are preferred.
50 *
51 * EXCHANGE
52 * A <domain-name> which specifies a host willing to act as a mail exchange
53 * for the owner name.
54 * </pre>
55 *
56 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
57 * @version $Rev$, $Date$
58 */
59 public class MailExchangeRecordDecoder implements RecordDecoder
60 {
61 public Map<String, Object> decode( ByteBuffer byteBuffer, short length ) throws IOException
62 {
63 Map<String, Object> attributes = new HashMap<String, Object>();
64 attributes.put( DnsAttribute.MX_PREFERENCE, byteBuffer.getShort() );
65 attributes.put( DnsAttribute.DOMAIN_NAME, DnsMessageDecoder.getDomainName( byteBuffer ) );
66 return attributes;
67 }
68 }