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/*
 * (C) Copyright 2003-2023, by Barak Naveh and Contributors.
 *
 * JGraphT : a free Java graph-theory library
 *
 * See the CONTRIBUTORS.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the
 * GNU Lesser General Public License v2.1 or later
 * which is available at
 * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
 */
package org.jgrapht.event;

import java.util.*;

/**
 * A listener that is notified when the graph's vertex set changes. It should be used when
 * only notifications on vertex-set changes are of interest. If all graph notifications are
 * of interest better use 
 * GraphListener.
 *
 * @param  the graph vertex type
 *
 * @author Barak Naveh
 * @see GraphListener
 */
public interface VertexSetListener
    extends EventListener
{
    /**
     * Notifies that a vertex has been added to the graph.
     *
     * @param e the vertex event.
     */
    void vertexAdded(GraphVertexChangeEvent e);

    /**
     * Notifies that a vertex has been removed from the graph.
     *
     * @param e the vertex event.
     */
    void vertexRemoved(GraphVertexChangeEvent e);
}