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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 net.sf.collections15.functors.closure;
17  
18  import net.sf.collections15.Closure;
19  
20  import java.io.Serializable;
21  
22  
23  /***
24   * <code>Closure</code> implementation that does nothing.
25   *
26   * @author Stephen Colebourne
27   * @author Chris Lambrou (port to Java 5.0)
28   * @since Collections15 1.0
29   */
30  public class NOPClosure <E> implements Closure<E>, Serializable
31  {
32  
33      static final long serialVersionUID = 851018997309347977L;
34  
35      /***
36       * Returns a <code>Closure</code> which does nothing.
37       *
38       * @return A <code>Closure</code> which does nothing.
39       *
40       * @since Collections15 1.0
41       */
42      public static <T> Closure<T> getInstance()
43      {
44          return new NOPClosure<T>();
45      }
46  
47      /***
48       * Creates a <code>Closure</code> which does nothing.
49       */
50      protected NOPClosure()
51      {
52      }
53  
54      /***
55       * Does nothing.
56       *
57       * @param input The input object.
58       */
59      public void execute(E input)
60      {
61      }
62  
63  }