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     */
017    package org.apache.commons.scxml.env;
018    
019    import org.apache.commons.scxml.SCXMLListener;
020    import org.apache.commons.scxml.model.Transition;
021    import org.apache.commons.scxml.model.TransitionTarget;
022    
023    /**
024     * An abstract adapter class for the <code>SXCMLListener</code> interface.
025     * This class exists as a convenience for creating listener objects, and as
026     * such all the methods in this class are empty.
027     *
028     * @since 0.7
029     */
030    public abstract class AbstractSCXMLListener implements SCXMLListener {
031    
032        /**
033         * @see SCXMLListener#onEntry(TransitionTarget)
034         */
035        public void onEntry(final TransitionTarget state) {
036            // empty
037        }
038    
039        /**
040         * @see SCXMLListener#onExit(TransitionTarget)
041         */
042        public void onExit(final TransitionTarget state) {
043            // empty
044        }
045    
046        /**
047    * @see SCXMLListener#onTransition(TransitionTarget,TransitionTarget,Transition)
048         */
049        public void onTransition(final TransitionTarget from,
050                final TransitionTarget to, final Transition transition) {
051            // empty
052        }
053    
054    }
055