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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  
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  }