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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.common;
21  
22  import org.apache.mina.util.SessionLog;
23  import org.apache.mina.util.SessionUtil;
24  
25  /**
26   * An abstract adapter class for {@link IoHandler}.  You can extend this
27   * class and selectively override required event handler methods only.  All
28   * methods do nothing by default. 
29   * 
30   * @author The Apache Directory Project (mina-dev@directory.apache.org)
31   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
32   */
33  public class IoHandlerAdapter implements IoHandler {
34      public void sessionCreated(IoSession session) throws Exception {
35          SessionUtil.initialize(session);
36      }
37  
38      public void sessionOpened(IoSession session) throws Exception {
39      }
40  
41      public void sessionClosed(IoSession session) throws Exception {
42      }
43  
44      public void sessionIdle(IoSession session, IdleStatus status)
45              throws Exception {
46      }
47  
48      public void exceptionCaught(IoSession session, Throwable cause)
49              throws Exception {
50          if (SessionLog.isWarnEnabled(session)) {
51              SessionLog.warn(session, "EXCEPTION, please implement "
52                      + getClass().getName()
53                      + ".exceptionCaught() for proper handling:", cause);
54          }
55      }
56  
57      public void messageReceived(IoSession session, Object message)
58              throws Exception {
59      }
60  
61      public void messageSent(IoSession session, Object message) throws Exception {
62      }
63  }