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Java > Open Source Codes > org > apache > excalibur > event > command > NullCommandFailureHandler


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
12  * implied.
13  *
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.excalibur.event.command;
18
19 /**
20  * NullCommandFailureHandler is used to do nothing if a command fails.
21  *
22  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
23  * @version CVS $ Revision: 1.1 $
24  */
25 public class NullCommandFailureHandler implements CommandFailureHandler
26 {
27     public static final NullCommandFailureHandler SHARED_INSTANCE = new NullCommandFailureHandler();
28     /**
29      * Handle a command failure. If a command throws an exception, it has failed. The
30      * CommandManager will call this method so that we can handle the problem effectively.
31      * This implementation does nothing and always returns <code>false</code>.
32      *
33      * @param command The original Command object that failed
34      * @param throwable The throwable that caused the failure
35      * @return <code>true</code> if the CommandManager should cease to process commands.
36      */
37     public boolean handleCommandFailure( Command command, Throwable JavaDoc throwable )
38     {
39         return false;
40     }
41 }
42
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