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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.changepw.protocol;
22  
23  
24  import java.io.IOException;
25  
26  import org.apache.directory.server.changepw.io.ChangePasswordErrorEncoder;
27  import org.apache.directory.server.changepw.io.ChangePasswordReplyEncoder;
28  import org.apache.directory.server.changepw.messages.ChangePasswordError;
29  import org.apache.directory.server.changepw.messages.ChangePasswordReply;
30  import org.apache.mina.common.ByteBuffer;
31  import org.apache.mina.common.IoSession;
32  import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
33  import org.apache.mina.filter.codec.ProtocolEncoderOutput;
34  
35  
36  /**
37   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
38   * @version $Rev: 549315 $, $Date: 2007-06-20 18:13:53 -0700 (Wed, 20 Jun 2007) $
39   */
40  public class ChangePasswordTcpEncoder extends ProtocolEncoderAdapter
41  {
42      ChangePasswordReplyEncoder replyEncoder = new ChangePasswordReplyEncoder();
43      ChangePasswordErrorEncoder errorEncoder = new ChangePasswordErrorEncoder();
44  
45  
46      public void encode( IoSession session, Object message, ProtocolEncoderOutput out ) throws IOException
47      {
48          ByteBuffer buf = ByteBuffer.allocate( 512 );
49  
50          // make space for int length
51          buf.putInt( 0 );
52  
53          if ( message instanceof ChangePasswordReply )
54          {
55              replyEncoder.encode( buf.buf(), ( ChangePasswordReply ) message );
56          }
57          else
58          {
59              if ( message instanceof ChangePasswordError )
60              {
61                  errorEncoder.encode( buf.buf(), ( ChangePasswordError ) message );
62              }
63          }
64  
65          // mark position
66          int pos = buf.position();
67  
68          // length is the data minus 4 bytes for the pre-pended length
69          int recordLength = buf.position() - 4;
70  
71          // write the length
72          buf.rewind();
73          buf.putInt( recordLength );
74  
75          // set the position back before flipping the buffer
76          buf.position( pos );
77          buf.flip();
78  
79          out.write( buf );
80      }
81  }