BlockCutpointGraphTest.java

/* ==========================================
 * 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 2003-2008, by Barak Naveh and Contributors.
 *
 * 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.
 */
/* -------------------------
 * BlockCutpointGraphTest.java
 * -------------------------
 * (C) Copyright 2007-2008, by France Telecom
 *
 * Original Author:  Guillaume Boulmier and Contributors.
 *
 * $Id$
 *
 * Changes
 * -------
 * 05-Jun-2007 : Initial revision (GB);
 *
 */
package org.jgrapht.alg;

import java.util.*;

import junit.framework.*;

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


/**
 * @author Guillaume Boulmier
 * @since July 5, 2007
 */
@SuppressWarnings("unchecked")
public class BlockCutpointGraphTest
    extends TestCase
{
    //~ Methods ----------------------------------------------------------------

    public void testBiconnected()
    {
        BiconnectedGraph graph = new BiconnectedGraph();

        BlockCutpointGraph blockCutpointGraph = new BlockCutpointGraph(graph);
        testGetBlock(blockCutpointGraph);

        assertEquals(0, blockCutpointGraph.getCutpoints().size());
        int nbBiconnectedComponents =
            blockCutpointGraph.vertexSet().size()
            - blockCutpointGraph.getCutpoints().size();
        assertEquals(1, nbBiconnectedComponents);
    }

    public void testGetBlock(BlockCutpointGraph blockCutpointGraph)
    {
        for (
            Iterator iter = blockCutpointGraph.vertexSet().iterator();
            iter.hasNext();)
        {
            UndirectedGraph component = (UndirectedGraph) iter.next();
            if (!component.edgeSet().isEmpty()) {
                for (
                    Iterator iterator = component.vertexSet().iterator();
                    iterator.hasNext();)
                {
                    Object vertex = iterator.next();
                    if (!blockCutpointGraph.getCutpoints().contains(vertex)) {
                        assertEquals(
                            component,
                            blockCutpointGraph.getBlock(vertex));
                    }
                }
            } else {
                assertTrue(
                    blockCutpointGraph.getCutpoints().contains(
                        component.vertexSet().iterator().next()));
            }
        }
    }

    public void testLinearGraph()
    {
        testLinearGraph(3);
        testLinearGraph(5);
    }

    public void testLinearGraph(int nbVertices)
    {
        UndirectedGraph graph = new SimpleGraph(DefaultEdge.class);

        LinearGraphGenerator generator = new LinearGraphGenerator(nbVertices);
        generator.generateGraph(
            graph,
            new ClassBasedVertexFactory<Object>(
                Object.class),
            null);

        BlockCutpointGraph blockCutpointGraph = new BlockCutpointGraph(graph);
        testGetBlock(blockCutpointGraph);

        assertEquals(nbVertices - 2, blockCutpointGraph.getCutpoints().size());
        int nbBiconnectedComponents =
            blockCutpointGraph.vertexSet().size()
            - blockCutpointGraph.getCutpoints().size();
        assertEquals(nbVertices - 1, nbBiconnectedComponents);
    }

    public void testNotBiconnected()
    {
        UndirectedGraph graph = new NotBiconnectedGraph();

        BlockCutpointGraph blockCutpointGraph = new BlockCutpointGraph(graph);
        testGetBlock(blockCutpointGraph);

        assertEquals(2, blockCutpointGraph.getCutpoints().size());
        int nbBiconnectedComponents =
            blockCutpointGraph.vertexSet().size()
            - blockCutpointGraph.getCutpoints().size();
        assertEquals(3, nbBiconnectedComponents);
    }
}

// End BlockCutpointGraphTest.java