DelegateFileFilter


1   /*
2    * Copyright 2002-2004 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.io.filefilter;
17  
18  import java.io.File  ;
19  import java.io.FileFilter  ;
20  import java.io.FilenameFilter  ;
21  
22  /**
23   * This class turns a Java FileFilter or FilenameFilter into an IO FileFilter.
24   * 
25   * @since Commons IO 1.0
26   * @version $Revision: 1.8 $ $Date: 2004/02/23 04:37:57 $
27   * 
28   * @author Henri Yandell
29   * @author Stephen Colebourne
30   */
31  public class DelegateFileFilter extends AbstractFileFilter {
32  
33      /** The Filename filter */
34      private FilenameFilter   filenameFilter;
35      /** The File filter */
36      private FileFilter   fileFilter;
37  
38      /**
39       * Constructs a delegate file filter around an existing FilenameFilter.
40       * 
41       * @param filter  the filter to decorate
42       */
43      public DelegateFileFilter(FilenameFilter   filter) {
44          if (filter == null) {
45              throw new IllegalArgumentException  ("The FilenameFilter must not be null");
46          }
47          this.filenameFilter = filter;
48      }
49  
50      /**
51       * Constructs a delegate file filter around an existing FileFilter.
52       * 
53       * @param filter  the filter to decorate
54       */
55      public DelegateFileFilter(FileFilter   filter) {
56          if (filter == null) {
57              throw new IllegalArgumentException  ("The FileFilter must not be null");
58          }
59          this.fileFilter = filter;
60      }
61  
62      /**
63       * Checks the filter.
64       * 
65       * @param file  the file to check
66       * @return true if the filter matches
67       */
68      public boolean accept(File   file) {
69          if (fileFilter != null) {
70              return fileFilter.accept(file);
71          } else {
72              return super.accept(file);
73          }
74      }
75  
76      /**
77       * Checks the filter.
78       * 
79       * @param dir  the directory
80       * @param name  the filename in the directory
81       * @return true if the filter matches
82       */
83      public boolean accept(File   dir, String   name) {
84          if (filenameFilter != null) {
85              return filenameFilter.accept(dir, name);
86          } else {
87              return super.accept(dir, name);
88          }
89      }
90      
91  }
92
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