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 * This filter produces a logical NOT of the filters specified.
24 *
25 * @since Commons IO 1.0
26 * @version $Revision: 591058 $ $Date: 2007-11-01 15:47:05 +0000 (Thu, 01 Nov 2007) $
27 *
28 * @author Stephen Colebourne
29 */
30 public class NotFileFilter extends AbstractFileFilter implements Serializable {
31
32 /** The filter */
33 private final IOFileFilter filter;
34
35 /**
36 * Constructs a new file filter that NOTs the result of another filters.
37 *
38 * @param filter the filter, must not be null
39 * @throws IllegalArgumentException if the filter is null
40 */
41 public NotFileFilter(IOFileFilter filter) {
42 if (filter == null) {
43 throw new IllegalArgumentException("The filter must not be null");
44 }
45 this.filter = filter;
46 }
47
48 /**
49 * Checks to see if both filters are true.
50 *
51 * @param file the File to check
52 * @return true if the filter returns false
53 */
54 public boolean accept(File file) {
55 return ! filter.accept(file);
56 }
57
58 /**
59 * Checks to see if both filters are true.
60 *
61 * @param file the File directory
62 * @param name the filename
63 * @return true if the filter returns false
64 */
65 public boolean accept(File file, String name) {
66 return ! filter.accept(file, name);
67 }
68
69 /**
70 * Provide a String representaion of this file filter.
71 *
72 * @return a String representaion
73 */
74 public String toString() {
75 return super.toString() + "(" + filter.toString() + ")";
76 }
77
78 }