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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  }