com.salesforce.jgrapht.UndirectedGraph Maven / Gradle / Ivy

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/*
 * (C) Copyright 2003-2017, by Barak Naveh and Contributors.
 *
 * JGraphT : a free Java graph-theory library
 *
 * This program and the accompanying materials are dual-licensed under
 * either
 *
 * (a) the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation, or (at your option) any
 * later version.
 *
 * or (per the licensee's choosing)
 *
 * (b) the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation.
 */
package com.salesforce.jgrapht;

/**
 * A graph whose all edges are undirected. This is the root interface of all undirected graphs.
 *
 * 
 * See 
 * http://mathworld.wolfram.com/Graph.html for more on undirected and on directed graphs.
 * 
 *
 * @param  the graph vertex type
 * @param  the graph edge type
 *
 * @author Barak Naveh
 * @since Jul 14, 2003
 */
public interface UndirectedGraph
    extends Graph
{
    /**
     * Returns the degree of the specified vertex. A degree of a vertex in an undirected graph is
     * the number of edges touching that vertex.
     *
     * @param vertex vertex whose degree is to be calculated.
     *
     * @return the degree of the specified vertex.
     */
    int degreeOf(V vertex);
}

// End UndirectedGraph.java