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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.vfs2.cache;
18  
19  import org.apache.commons.vfs2.FileName;
20  import org.apache.commons.vfs2.FileObject;
21  import org.apache.commons.vfs2.FileSystem;
22  
23  /**
24   * A {@link org.apache.commons.vfs2.FilesCache} implementation.
25   * <p>
26   * This implementation never ever caches a single file.
27   * <p>
28   * <b>Notice</b>: if you use resolveFile(uri) multiple times with the same path, the system will always
29   * create a new instance. Changes on one instance of this file are not seen by the others.
30   */
31  public class NullFilesCache extends AbstractFilesCache
32  {
33      @Override
34      public void putFile(final FileObject file)
35      {
36      }
37  
38      @Override
39      public boolean putFileIfAbsent(final FileObject file)
40      {
41          return false;
42      }
43  
44      @Override
45      public FileObject getFile(final FileSystem filesystem, final FileName name)
46      {
47          return null;
48      }
49  
50      @Override
51      public void clear(final FileSystem filesystem)
52      {
53      }
54  
55      @Override
56      public void removeFile(final FileSystem filesystem, final FileName name)
57      {
58      }
59  }