CloneTest.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.
 */
/* --------------
 * CloneTest.java
 * --------------
 * (C) Copyright 2003-2008, by John V. Sichi and Contributors.
 *
 * Original Author:  John V. Sichi
 * Contributor(s):   -
 *
 * $Id$
 *
 * Changes
 * -------
 * 06-Oct-2003 : Initial revision (JVS);
 *
 */
package org.jgrapht.graph;

import org.jgrapht.*;


/**
 * A unit test for a cloning bug, adapted from a forum entry from Linda Buisman.
 *
 * @author John V. Sichi
 * @since Oct 6, 2003
 */
public class CloneTest
    extends EnhancedTestCase
{
    //~ Constructors -----------------------------------------------------------

    /**
     * @see junit.framework.TestCase#TestCase(java.lang.String)
     */
    public CloneTest(String name)
    {
        super(name);
    }

    //~ Methods ----------------------------------------------------------------

    /**
     * Test graph cloning.
     */
    @SuppressWarnings("unchecked")
    public void testCloneSpecificsBug()
    {
        SimpleGraph<String, DefaultEdge> g1 =
            new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);
        String one = "1";
        String two = "2";
        String three = "3";
        g1.addVertex(one);
        g1.addVertex(two);
        g1.addVertex(three);
        g1.addEdge(one, two);
        g1.addEdge(two, three);

        SimpleGraph<String, DefaultEdge> g2 =
            (SimpleGraph<String, DefaultEdge>) g1.clone(); // Type-safty
                                                           // warning OK with
                                                           // clone
        assertEquals(2, g2.edgeSet().size());
        assertNotNull(g2.getEdge(one, two));
        assertTrue(g2.removeEdge(g2.getEdge(one, two)));
        assertNotNull(g2.removeEdge("2", "3"));
        assertTrue(g2.edgeSet().isEmpty());
    }

    /**
     * Tests usage of {@link ParanoidGraph} for detecting broken vertex
     * implementations.
     */
    public void testParanoidGraph()
    {
        BrokenVertex v1 = new BrokenVertex(1);
        BrokenVertex v2 = new BrokenVertex(2);
        BrokenVertex v3 = new BrokenVertex(1);

        SimpleGraph<BrokenVertex, DefaultEdge> g =
            new SimpleGraph<BrokenVertex, DefaultEdge>(DefaultEdge.class);
        ParanoidGraph<BrokenVertex, DefaultEdge> pg =
            new ParanoidGraph<BrokenVertex, DefaultEdge>(g);
        pg.addVertex(v1);
        pg.addVertex(v2);
        try {
            pg.addVertex(v3);

            // should not get here
            assertFalse();
        } catch (IllegalArgumentException ex) {
            // expected, swallow
        }
    }

    //~ Inner Classes ----------------------------------------------------------

    private class BrokenVertex
    {
        private int x;

        BrokenVertex(int x)
        {
            this.x = x;
        }

        public boolean equals(Object other)
        {
            if (!(other instanceof BrokenVertex)) {
                return false;
            }
            return x == ((BrokenVertex) other).x;
        }
    }
}

// End CloneTest.java