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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  package org.apache.mina.example.proxy;
21  
22  import java.nio.charset.Charset;
23  
24  import org.apache.mina.common.ByteBuffer;
25  import org.apache.mina.common.IoHandlerAdapter;
26  import org.apache.mina.common.IoSession;
27  import org.apache.mina.common.TrafficMask;
28  import org.apache.mina.util.SessionLog;
29  
30  /**
31   * Base class of {@link org.apache.mina.common.IoHandler} classes which handle
32   * proxied connections.
33   *
34   * @author The Apache Directory Project (mina-dev@directory.apache.org)
35   * @version $Rev$, $Date$
36   *
37   */
38  public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
39      private static Charset CHARSET = Charset.forName("iso8859-1");
40  
41      public void sessionCreated(IoSession session) throws Exception {
42          session.setTrafficMask(TrafficMask.NONE);
43      }
44  
45      public void sessionClosed(IoSession session) throws Exception {
46          if (session.getAttachment() != null) {
47              ((IoSession) session.getAttachment()).setAttachment(null);
48              ((IoSession) session.getAttachment()).close();
49              session.setAttachment(null);
50          }
51      }
52  
53      public void messageReceived(IoSession session, Object message)
54              throws Exception {
55          ByteBuffer rb = (ByteBuffer) message;
56          ByteBuffer wb = ByteBuffer.allocate(rb.remaining());
57          rb.mark();
58          wb.put(rb);
59          wb.flip();
60          ((IoSession) session.getAttachment()).write(wb);
61          rb.reset();
62          SessionLog.info(session, rb.getString(CHARSET.newDecoder()));
63      }
64  }