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