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
21 /**
22 * This filter produces a logical NOT of the filters specified.
23 *
24 * @since Commons IO 1.0
25 * @version $Revision: 437567 $ $Date: 2006-08-28 08:39:07 +0200 (Mo, 28 Aug 2006) $
26 *
27 * @author Stephen Colebourne
28 */
29 public class NotFileFilter extends AbstractFileFilter {
30
31 /** The filter */
32 private IOFileFilter filter;
33
34 /**
35 * Constructs a new file filter that NOTs the result of another filters.
36 *
37 * @param filter the filter, must not be null
38 * @throws IllegalArgumentException if the filter is null
39 */
40 public NotFileFilter(IOFileFilter filter) {
41 if (filter == null) {
42 throw new IllegalArgumentException("The filter must not be null");
43 }
44 this.filter = filter;
45 }
46
47 /**
48 * Checks to see if both filters are true.
49 *
50 * @param file the File to check
51 * @return true if the filter returns false
52 */
53 public boolean accept(File file) {
54 return ! filter.accept(file);
55 }
56
57 /**
58 * Checks to see if both filters are true.
59 *
60 * @param file the File directory
61 * @param name the filename
62 * @return true if the filter returns false
63 */
64 public boolean accept(File file, String name) {
65 return ! filter.accept(file, name);
66 }
67
68 }