StringValueTransformer


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 the <code>String.valueOf</code>.
24   * 
25   * @since Commons Collections 3.0
26   * @version $Revision: 1.7 $ $Date: 2004/05/16 11:36:31 $
27   *
28   * @author Stephen Colebourne
29   */
30  public final class StringValueTransformer implements Transformer, Serializable   {
31  
32      /** Serial version UID */
33      static final long serialVersionUID = 7511110693171758606L;
34  
35      /** Singleton predicate instance */
36      public static final Transformer INSTANCE = new StringValueTransformer();
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       * Restricted constructor.
50       */
51      private StringValueTransformer() {
52          super();
53      }
54  
55      /**
56       * Transforms the input to result by calling <code>String.valueOf</code>.
57       * 
58       * @param input  the input object to transform
59       * @return the transformed result
60       */
61      public Object   transform(Object   input) {
62          return String.valueOf(input);
63      }
64  
65  }
66
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