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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.predicate;
17  
18  import net.sf.collections15.Predicate;
19  
20  import java.io.Serializable;
21  
22  /***
23   * <code>Predicate</code> implementation that always evaluates to
24   * <code>false</code>.
25   *
26   * @author Stephen Colebourne
27   * @author Chris Lambrou (port to Java 5.0)
28   * @since Collections15 1.0
29   */
30  public final class FalsePredicate <E> implements Predicate<E>, Serializable
31  {
32  
33      static final long serialVersionUID = 8274221249111691049L;
34  
35      /***
36       * ReturnsFactory returning the singleton instance.
37       *
38       * @return the singleton instance
39       *
40       * @since Commons Collections 3.1
41       */
42      public static <T> Predicate<T> getInstance()
43      {
44          return new FalsePredicate<T>();
45      }
46  
47      /***
48       * Creates a new instance.
49       */
50      protected FalsePredicate()
51      {
52      }
53  
54      /***
55       * Evaluates the <code>Predicate</code>, always returning
56       * <code>false</code>.
57       *
58       * @param object The input object.
59       *
60       * @return Always returns <code>false</code>.
61       */
62      public boolean evaluate(E object)
63      {
64          return false;
65      }
66  
67  }