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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.net.InetAddress;
26  import java.util.HashMap;
27  import java.util.Map;
28  
29  import org.apache.directory.server.dns.store.DnsAttribute;
30  import org.apache.mina.common.ByteBuffer;
31  
32  
33  /**
34   * A decoder for A records. As per RFC 1035
35   * 
36   * <pre>
37   *   3.4.1. A RDATA format
38   *
39   *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
40   *     |                    ADDRESS                    |
41   *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
42   *
43   *   where:
44   *
45   *   ADDRESS
46   *       A 32 bit Internet address. 
47   * </pre>
48   * 
49   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
50   * @version $Rev$, $Date$
51   */
52  public class AddressRecordDecoder implements RecordDecoder
53  {
54      public Map<String, Object> decode( ByteBuffer byteBuffer, short length ) throws IOException
55      {
56          Map<String, Object> attributes = new HashMap<String, Object>();
57          byte[] addressBytes = new byte[length];
58          byteBuffer.get( addressBytes );
59          attributes.put( DnsAttribute.IP_ADDRESS, InetAddress.getByAddress( addressBytes ) );
60          return attributes;
61      }
62  }