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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.io.filefilter;
18  
19  import java.io.File;
20  import java.io.Serializable;
21  
22  /**
23   * A file filter that always returns true.
24   *
25   * @since 1.0
26   * @version $Id$
27   * @see FileFilterUtils#trueFileFilter()
28   */
29  public class TrueFileFilter implements IOFileFilter, Serializable {
30  
31      private static final long serialVersionUID = 8782512160909720199L;
32      /**
33       * Singleton instance of true filter.
34       * @since 1.3
35       */
36      public static final IOFileFilter TRUE = new TrueFileFilter();
37      /**
38       * Singleton instance of true filter.
39       * Please use the identical TrueFileFilter.TRUE constant.
40       * The new name is more JDK 1.5 friendly as it doesn't clash with other
41       * values when using static imports.
42       */
43      public static final IOFileFilter INSTANCE = TRUE;
44  
45      /**
46       * Restrictive constructor.
47       */
48      protected TrueFileFilter() {
49      }
50  
51      /**
52       * Returns true.
53       *
54       * @param file  the file to check (ignored)
55       * @return true
56       */
57      @Override
58      public boolean accept(final File file) {
59          return true;
60      }
61  
62      /**
63       * Returns true.
64       *
65       * @param dir  the directory to check (ignored)
66       * @param name  the filename (ignored)
67       * @return true
68       */
69      @Override
70      public boolean accept(final File dir, final String name) {
71          return true;
72      }
73  
74  }