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


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.Transformer;
21
22 /**
23  * Transformer implementation that does nothing.
24  *
25  * @since Commons Collections 3.0
26  * @version $Revision: 1.6 $ $Date: 2004/05/16 11:36:31 $
27  *
28  * @author Stephen Colebourne
29  */
30 public class NOPTransformer implements Transformer, Serializable JavaDoc {
31
32     /** Serial version UID */
33     static final long serialVersionUID = 2133891748318574490L;
34
35     /** Singleton predicate instance */
36     public static final Transformer INSTANCE = new NOPTransformer();
37
38     /**
39      * Factory returning the singleton instance.
40      *
41      * @return the singleton instance
42      * @since Commons Collections 3.1
43      */
44     public static Transformer getInstance() {
45         return INSTANCE;
46     }
47
48     /**
49      * Constructor
50      */
51     private NOPTransformer() {
52         super();
53     }
54
55     /**
56      * Transforms the input to result by doing nothing.
57      *
58      * @param input the input object to transform
59      * @return the transformed result which is the input
60      */
61     public Object JavaDoc transform(Object JavaDoc input) {
62         return input;
63     }
64
65 }
66
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