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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 org.apache.directory.server.changepw.io.ChangePasswordRequestDecoder;
25  import org.apache.mina.common.BufferDataException;
26  import org.apache.mina.common.ByteBuffer;
27  import org.apache.mina.common.IoSession;
28  import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
29  import org.apache.mina.filter.codec.ProtocolDecoderOutput;
30  
31  
32  /**
33   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34   * @version $Rev: 549315 $, $Date: 2007-06-20 18:13:53 -0700 (Wed, 20 Jun 2007) $
35   */
36  public class ChangePasswordTcpDecoder extends CumulativeProtocolDecoder
37  {
38      private ChangePasswordRequestDecoder decoder = new ChangePasswordRequestDecoder();
39  
40      private int maxObjectSize = 16384; // 16KB
41  
42  
43      /**
44       * Returns the allowed maximum size of the object to be decoded.
45       * If the size of the object to be decoded exceeds this value, this
46       * decoder will throw a {@link BufferDataException}.  The default
47       * value is <tt>16384</tt> (16KB).
48       * 
49       * @return The max object size.
50       */
51      public int getMaxObjectSize()
52      {
53          return maxObjectSize;
54      }
55  
56  
57      /**
58       * Sets the allowed maximum size of the object to be decoded.
59       * If the size of the object to be decoded exceeds this value, this
60       * decoder will throw a {@link BufferDataException}.  The default
61       * value is <tt>16384</tt> (16KB).
62       * 
63       * @param maxObjectSize 
64       */
65      public void setMaxObjectSize( int maxObjectSize )
66      {
67          if ( maxObjectSize <= 0 )
68          {
69              throw new IllegalArgumentException( "maxObjectSize: " + maxObjectSize );
70          }
71  
72          this.maxObjectSize = maxObjectSize;
73      }
74  
75  
76      @Override
77      protected boolean doDecode( IoSession session, ByteBuffer in, ProtocolDecoderOutput out ) throws Exception
78      {
79          if ( !in.prefixedDataAvailable( 4, maxObjectSize ) )
80          {
81              return false;
82          }
83  
84          in.getInt();
85  
86          out.write( decoder.decode( in.buf() ) );
87  
88          return true;
89      }
90  }