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 }