transitiveclosuretest.java

JAVA图论的算法包。用过觉得还不错

/* ==========================================
 * JGraphT : a free Java graph-theory library
 * ==========================================
 *
 * Project Info:  http://jgrapht.sourceforge.net/
 * Project Creator:  Barak Naveh (http://sourceforge.net/users/barak_naveh)
 *
 * (C) Copyright 2003-2007, by Barak Naveh and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */
/* ------------------------------
 * TransitiveClosureTest.java
 * ------------------------------
 * (C) Copyright 2007, by Vinayak R. Borkar.
 *
 * Original Author:  Vinayak R. Borkar
 * Contributor(s):
 *
 * Changes
 * -------
 * 5-May-2007: Initial revision (VRB);
 *
 */
package org.jgrapht.alg;

import junit.framework.*;

import org.jgrapht.*;
import org.jgrapht.generate.*;
import org.jgrapht.graph.*;


/**
 */
public class TransitiveClosureTest
    extends TestCase
{
    //~ Methods ----------------------------------------------------------------

    public void testLinearGraph()
    {
        SimpleDirectedGraph<Integer, DefaultEdge> graph =
            new SimpleDirectedGraph<Integer, DefaultEdge>(DefaultEdge.class);

        int N = 10;
        LinearGraphGenerator<Integer, DefaultEdge> gen =
            new LinearGraphGenerator<Integer, DefaultEdge>(N);

        VertexFactory<Integer> vf =
            new VertexFactory<Integer>() {
                private int m_index = 0;

                public Integer createVertex()
                {
                    return Integer.valueOf(m_index++);
                }
            };
        gen.generateGraph(graph, vf, null);
        TransitiveClosure.INSTANCE.closeSimpleDirectedGraph(graph);

        assertEquals(true, graph.edgeSet().size() == ((N * (N - 1)) / 2));
        for (int i = 0; i < N; ++i) {
            for (int j = i + 1; j < N; ++j) {
                assertEquals(
                    true,
                    graph.getEdge(Integer.valueOf(i), Integer.valueOf(j))
                    != null);
            }
        }
    }

    public void testRingGraph()
    {
        SimpleDirectedGraph<Integer, DefaultEdge> graph =
            new SimpleDirectedGraph<Integer, DefaultEdge>(DefaultEdge.class);

        int N = 10;
        RingGraphGenerator<Integer, DefaultEdge> gen =
            new RingGraphGenerator<Integer, DefaultEdge>(N);

        VertexFactory<Integer> vf =
            new VertexFactory<Integer>() {
                private int m_index = 0;

                public Integer createVertex()
                {
                    return Integer.valueOf(m_index++);
                }
            };
        gen.generateGraph(graph, vf, null);
        TransitiveClosure.INSTANCE.closeSimpleDirectedGraph(graph);

        assertEquals(true, graph.edgeSet().size() == (N * (N - 1)));
        for (int i = 0; i < N; ++i) {
            for (int j = 0; j < N; ++j) {
                assertEquals(
                    true,
                    (i == j)
                    || (graph.getEdge(Integer.valueOf(i), Integer.valueOf(j))
                        != null));
            }
        }
    }
}

// End TransitiveClosureTest.java