001 /* 002 * Copyright 2003-2004 The Apache Software Foundation 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 package org.apache.commons.events.observable; 017 018 import java.util.EventListener; 019 020 /** 021 * An empty listener designed to be subclassed. 022 * <p> 023 * This interface exists to mark independent subclasses as fulfilling the 024 * role of an event listener for collection modification events. 025 * 026 * @since Commons Events 1.0 027 * @version $Revision: 155443 $ $Date: 2005-02-26 13:19:51 +0000 (Sat, 26 Feb 2005) $ 028 * 029 * @author Stephen Colebourne 030 */ 031 public interface ModificationListener extends EventListener { 032 033 // no methods - subinterfaces define them 034 035 }