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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  /***
24   * <code>Predicate</code> implementation that always evaluates to
25   * <code>true</code>.
26   *
27   * @author Stephen Colebourne
28   * @author Chris Lambrou (port to Java 5.0)
29   * @since Collections15 1.0
30   */
31  public final class TruePredicate <E> implements Predicate<E>, Serializable
32  {
33  
34      static final long serialVersionUID = 8274221249111691049L;
35  
36      /***
37       * ReturnsFactory returning the singleton instance.
38       *
39       * @return the singleton instance
40       *
41       * @since Commons Collections 3.1
42       */
43      public static <T> Predicate<T> getInstance()
44      {
45          return new TruePredicate<T>();
46      }
47  
48      /***
49       * Creates a new instance.
50       */
51      protected TruePredicate()
52      {
53      }
54  
55      /***
56       * Evaluates the <code>Predicate</code>, always returning
57       * <code>true</code>.
58       *
59       * @param object The input object.
60       *
61       * @return Always returns <code>true</code>.
62       */
63      public boolean evaluate(E object)
64      {
65          return true;
66      }
67  
68  }