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Java > Open Source Codes > org > apache > mina > handler > chain > ChainedIoHandler


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.handler.chain;
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  * An {@link IoHandler} which executes an {@link IoHandlerChain}
28  * on a <tt>messageReceived</tt> event.
29  *
30  * @author The Apache Directory Project (mina-dev@directory.apache.org)
31  * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (금, 13 7월 2007) $
32  */
33 public class ChainedIoHandler extends IoHandlerAdapter {
34     private final IoHandlerChain chain;
35
36     /**
37      * Creates a new instance which contains an empty {@link IoHandlerChain}.
38      */
39     public ChainedIoHandler() {
40         chain = new IoHandlerChain();
41     }
42
43     /**
44      * Creates a new instance which executes the specified
45      * {@link IoHandlerChain} on a <tt>messageReceived</tt> event.
46      *
47      * @param chain an {@link IoHandlerChain} to execute
48      */
49     public ChainedIoHandler(IoHandlerChain chain) {
50         if (chain == null) {
51             throw new NullPointerException JavaDoc("chain");
52         }
53         this.chain = chain;
54     }
55
56     /**
57      * Returns the {@link IoHandlerCommand} this handler will use to
58      * handle <tt>messageReceived</tt> events.
59      */
60     public IoHandlerChain getChain() {
61         return chain;
62     }
63
64     /**
65      * Handles the specified <tt>messageReceived</tt> event with the
66      * {@link IoHandlerCommand} or {@link IoHandlerChain} you specified
67      * in the constructor.
68      */
69     public void messageReceived(IoSession session, Object JavaDoc message)
70             throws Exception JavaDoc {
71         chain.execute(null, session, message);
72     }
73 }
74
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