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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.vfs.cache;
18  
19  import org.apache.commons.vfs.FileName;
20  import org.apache.commons.vfs.FileObject;
21  import org.apache.commons.vfs.FileSystem;
22  
23  /***
24   * <p/>
25   * A {@link org.apache.commons.vfs.FilesCache} implementation.<br>
26   * This implementation never ever caches a single file.
27   * </p>
28   * <p/>
29   * <b>Notice: if you use resolveFile(uri) multiple times with the same path, the system will always create a new instance.
30   * Changes on one instance of this file are not seen by the others.</b>
31   * </p>
32   *
33   * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
34   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
35   */
36  public class NullFilesCache extends AbstractFilesCache
37  {
38      public void putFile(final FileObject file)
39      {
40      }
41  
42      public FileObject getFile(final FileSystem filesystem, final FileName name)
43      {
44          return null;
45      }
46  
47      public void clear(FileSystem filesystem)
48      {
49      }
50  
51      public void close()
52      {
53          super.close();
54      }
55  
56      public void removeFile(FileSystem filesystem, FileName name)
57      {
58      }
59  
60      public void touchFile(FileObject file)
61      {
62      }
63  }