CloneTransformer


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  ;
19  
20  import org.apache.commons.collections.Transformer;
21  
22  /**
23   * Transformer implementation that returns a clone of the input object.
24   * <p>
25   * Clone is performed using <code>PrototypeFactory.getInstance(input).create()</code>.
26   * 
27   * @since Commons Collections 3.0
28   * @version $Revision: 1.6 $ $Date: 2004/05/16 11:36:31 $
29   *
30   * @author Stephen Colebourne
31   */
32  public class CloneTransformer implements Transformer, Serializable   {
33  
34      /** Serial version UID */
35      static final long serialVersionUID = -8188742709499652567L;
36  
37      /** Singleton predicate instance */
38      public static final Transformer INSTANCE = new CloneTransformer();
39  
40      /**
41       * Factory returning the singleton instance.
42       * 
43       * @return the singleton instance
44       * @since Commons Collections 3.1
45       */
46      public static Transformer getInstance() {
47          return INSTANCE;
48      }
49  
50      /**
51       * Constructor
52       */
53      private CloneTransformer() {
54          super();
55      }
56  
57      /**
58       * Transforms the input to result by cloning it.
59       * 
60       * @param input  the input object to transform
61       * @return the transformed result
62       */
63      public Object   transform(Object   input) {
64          if (input == null) {
65              return null;
66          }
67          return PrototypeFactory.getInstance(input).create();
68      }
69  
70  }
71
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