001    package org.apache.commons.graph.visit;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import org.apache.commons.graph.Edge;
023    import org.apache.commons.graph.Graph;
024    import org.apache.commons.graph.Vertex;
025    
026    /**
027     * Base NOOP {@link GraphVisitHandler} implementation.
028     *
029     * @param <V> the Graph vertices type
030     * @param <E> the Graph edges type
031     */
032    public class BaseGraphVisitHandler<V extends Vertex, E extends Edge<V>>
033        implements GraphVisitHandler<V, E>
034    {
035    
036        /**
037         * {@inheritDoc}
038         */
039        public void discoverGraph( Graph<V, E> graph )
040        {
041            // do nothing
042        }
043    
044        /**
045         * {@inheritDoc}
046         */
047        public void discoverVertex( V vertex )
048        {
049            // do nothing
050        }
051    
052        /**
053         * {@inheritDoc}
054         */
055        public void discoverEdge( E edge )
056        {
057            // do nothing
058        }
059    
060        /**
061         * {@inheritDoc}
062         */
063        public void finishEdge( E edge )
064        {
065            // do nothing
066        }
067    
068        /**
069         * {@inheritDoc}
070         */
071        public void finishVertex( V vertex )
072        {
073            // do nothing
074        }
075    
076        /**
077         * {@inheritDoc}
078         */
079        public void finishGraph( Graph<V, E> graph )
080        {
081            // do nothing
082        }
083    
084    }