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Java > Open Source Codes > org > apache > commons > collections > functors > ExceptionClosure


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.collections.functors;
17
18 import java.io.Serializable JavaDoc;
19
20 import org.apache.commons.collections.Closure;
21 import org.apache.commons.collections.FunctorException;
22
23 /**
24  * Closure implementation that always throws an exception.
25  *
26  * @since Commons Collections 3.0
27  * @version $Revision: 1.7 $ $Date: 2004/05/16 11:47:38 $
28  *
29  * @author Stephen Colebourne
30  */
31 public final class ExceptionClosure implements Closure, Serializable JavaDoc {
32
33     /** Serial version UID */
34     static final long serialVersionUID = 7179106032121985545L;
35     
36
37     /** Singleton predicate instance */
38     public static final Closure INSTANCE = new ExceptionClosure();
39
40     /**
41      * Factory returning the singleton instance.
42      *
43      * @return the singleton instance
44      * @since Commons Collections 3.1
45      */
46     public static Closure getInstance() {
47         return INSTANCE;
48     }
49
50     /**
51      * Restricted constructor.
52      */
53     private ExceptionClosure() {
54         super();
55     }
56
57     /**
58      * Always throw an exception.
59      *
60      * @param input the input object
61      * @throws FunctorException always
62      */
63     public void execute(Object JavaDoc input) {
64         throw new FunctorException("ExceptionClosure invoked");
65     }
66
67 }
68
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