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    }