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1   /*
2    *   @(#) $Id: TextLineEncoder.java 264677 2005-08-30 02:44:35Z trustin $
3    *
4    *   Copyright 2004 The Apache Software Foundation
5    *
6    *   Licensed under the Apache License, Version 2.0 (the "License");
7    *   you may not use this file except in compliance with the License.
8    *   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, software
13   *   distributed under the License is distributed on an "AS IS" BASIS,
14   *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   *   See the License for the specific language governing permissions and
16   *   limitations under the License.
17   *
18   */
19  package org.apache.mina.examples.reverser;
20  
21  import org.apache.mina.common.ByteBuffer;
22  import org.apache.mina.protocol.ProtocolEncoder;
23  import org.apache.mina.protocol.ProtocolEncoderOutput;
24  import org.apache.mina.protocol.ProtocolSession;
25  import org.apache.mina.protocol.ProtocolViolationException;
26  
27  /***
28   * Encodes a string into a text line which ends with <code>"\r\n"</code>.
29   * 
30   * @author Trustin Lee (trustin@apache.org)
31   * @version $Rev: 264677 $, $Date: 2005-08-30 11:44:35 +0900 $,
32   */
33  public class TextLineEncoder implements ProtocolEncoder
34  {
35  
36      public void encode( ProtocolSession session, Object message,
37                         ProtocolEncoderOutput out )
38              throws ProtocolViolationException
39      {
40  
41          String val = message.toString();
42          // Don't accept too long strings.
43          if( val.length() > 256 )
44          {
45              throw new ProtocolViolationException(
46                                                    "Cannot encode too long string." );
47          }
48  
49          val += "\r\n";
50  
51          ByteBuffer buf = ByteBuffer.allocate( val.length() );
52          for( int i = 0; i < val.length(); i++ )
53          {
54              buf.put( ( byte ) val.charAt( i ) );
55          }
56  
57          buf.flip();
58          out.write( buf );
59      }
60  }