001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.configuration2.io; 018 019/** 020 * <p> 021 * A listener interface for receiving notifications about updates of a {@code FileHandler}. 022 * </p> 023 * <p> 024 * Objects implementing this interface are notified when properties of a {@code FileHandler} change or when a load or 025 * save operation is performed. This can be useful for various use cases, e.g. when monitoring file-based 026 * configurations. 027 * </p> 028 * 029 * @since 2.0 030 */ 031public interface FileHandlerListener { 032 /** 033 * Notification that the associated file has been loaded. This method is called directly after the load operation. 034 * 035 * @param handler the file handler 036 */ 037 void loaded(FileHandler handler); 038 039 /** 040 * Notification that the associated file is about to be loaded. This method is called immediately before the load 041 * operation. 042 * 043 * @param handler the file handler 044 */ 045 void loading(FileHandler handler); 046 047 /** 048 * Notification that a property of the monitored {@code FileHandler} has changed. 049 * 050 * @param handler the file handler 051 */ 052 void locationChanged(FileHandler handler); 053 054 /** 055 * Notification that the associated file has been saved. This method is called directly after the save operation. 056 * 057 * @param handler the file handler 058 */ 059 void saved(FileHandler handler); 060 061 /** 062 * Notification that the associated file is about to be saved. This method is called immediately before the save 063 * operation. 064 * 065 * @param handler the file handler 066 */ 067 void saving(FileHandler handler); 068}