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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  /**
23   * An abstract adapter class for {@link IoFilter}.  You can extend
24   * this class and selectively override required event filter methods only.  All
25   * methods forwards events to the next filter by default.
26   * 
27   * @author The Apache Directory Project (mina-dev@directory.apache.org)
28   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
29   */
30  public class IoFilterAdapter implements IoFilter {
31      public void init() throws Exception {
32      }
33  
34      public void destroy() throws Exception {
35      }
36  
37      public void onPreAdd(IoFilterChain parent, String name,
38              NextFilter nextFilter) throws Exception {
39      }
40  
41      public void onPostAdd(IoFilterChain parent, String name,
42              NextFilter nextFilter) throws Exception {
43      }
44  
45      public void onPreRemove(IoFilterChain parent, String name,
46              NextFilter nextFilter) throws Exception {
47      }
48  
49      public void onPostRemove(IoFilterChain parent, String name,
50              NextFilter nextFilter) throws Exception {
51      }
52  
53      public void sessionCreated(NextFilter nextFilter, IoSession session)
54              throws Exception {
55          nextFilter.sessionCreated(session);
56      }
57  
58      public void sessionOpened(NextFilter nextFilter, IoSession session)
59              throws Exception {
60          nextFilter.sessionOpened(session);
61      }
62  
63      public void sessionClosed(NextFilter nextFilter, IoSession session)
64              throws Exception {
65          nextFilter.sessionClosed(session);
66      }
67  
68      public void sessionIdle(NextFilter nextFilter, IoSession session,
69              IdleStatus status) throws Exception {
70          nextFilter.sessionIdle(session, status);
71      }
72  
73      public void exceptionCaught(NextFilter nextFilter, IoSession session,
74              Throwable cause) throws Exception {
75          nextFilter.exceptionCaught(session, cause);
76      }
77  
78      public void messageReceived(NextFilter nextFilter, IoSession session,
79              Object message) throws Exception {
80          nextFilter.messageReceived(session, message);
81      }
82  
83      public void messageSent(NextFilter nextFilter, IoSession session,
84              Object message) throws Exception {
85          nextFilter.messageSent(session, message);
86      }
87  
88      public void filterWrite(NextFilter nextFilter, IoSession session,
89              WriteRequest writeRequest) throws Exception {
90          nextFilter.filterWrite(session, writeRequest);
91      }
92  
93      public void filterClose(NextFilter nextFilter, IoSession session)
94              throws Exception {
95          nextFilter.filterClose(session);
96      }
97  }