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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.FileFilter;
21  import java.io.FilenameFilter;
22  
23  /**
24   * This class turns a Java FileFilter or FilenameFilter into an IO FileFilter.
25   * 
26   * @since Commons IO 1.0
27   * @version $Revision: 471628 $ $Date: 2006-11-06 05:06:45 +0100 (Mo, 06 Nov 2006) $
28   * 
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  }