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 }