ReverseProtocolHandler


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  package org.apache.mina.example.reverser;
21  
22  import org.apache.mina.common.IoHandler;
23  import org.apache.mina.common.IoHandlerAdapter;
24  import org.apache.mina.common.IoSession;
25  
26  /**
27   * {@link IoHandler} implementation of reverser server protocol.
28   * 
29   * @author The Apache Directory Project (mina-dev@directory.apache.org)
30   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (금, 13  7월 2007) $,
31   */
32  public class ReverseProtocolHandler extends IoHandlerAdapter {
33      public void exceptionCaught(IoSession session, Throwable   cause) {
34          cause.printStackTrace();
35          // Close connection when unexpected exception is caught.
36          session.close();
37      }
38  
39      public void messageReceived(IoSession session, Object   message) {
40          // Reverse reveiced string
41          String   str = message.toString();
42          StringBuffer   buf = new StringBuffer  (str.length());
43          for (int i = str.length() - 1; i >= 0; i--) {
44              buf.append(str.charAt(i));
45          }
46  
47          // and write it back.
48          session.write(buf.toString());
49      }
50  }
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