01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
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 MINA Project (dev@mina.apache.org)
30: * @version $Rev: 588178 $, $Date: 2007-10-25 03:28:40 -0600 (Thu, 25 Oct 2007) $,
31: */
32: public class ReverseProtocolHandler extends IoHandlerAdapter {
33: @Override
34: public void exceptionCaught(IoSession session, Throwable cause) {
35: // Close connection when unexpected exception is caught.
36: session.close();
37: }
38:
39: @Override
40: public void messageReceived(IoSession session, Object message) {
41: // Reverse reveiced string
42: String str = message.toString();
43: StringBuffer buf = new StringBuffer(str.length());
44: for (int i = str.length() - 1; i >= 0; i--) {
45: buf.append(str.charAt(i));
46: }
47:
48: // and write it back.
49: session.write(buf.toString());
50: }
51: }
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