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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;
18  
19  /**
20   * Listens for changes to a file.
21   */
22  public interface FileListener {
23  
24      /**
25       * Called when a file is changed.
26       * <p>
27       * This will only happen if you monitor the file using {@link FileMonitor}.
28       * </p>
29       *
30       * @param event The FileChangeEvent.
31       * @throws Exception if an error occurs.
32       */
33      void fileChanged(FileChangeEvent event) throws Exception;
34  
35      /**
36       * Called when a file is created.
37       *
38       * @param event The FileChangeEvent.
39       * @throws Exception if an error occurs.
40       */
41      void fileCreated(FileChangeEvent event) throws Exception;
42  
43      /**
44       * Called when a file is deleted.
45       *
46       * @param event The FileChangeEvent.
47       * @throws Exception if an error occurs.
48       */
49      void fileDeleted(FileChangeEvent event) throws Exception;
50  }