/* ==========================================
 * 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 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.
 */
/* ------------------------------
 * DOTExporterTest.java
 * ------------------------------
 * (C) Copyright 2003-2008, by Barak Naveh and Contributors.
 *
 * Original Author:  Trevor Harmon
 *
 */
package org.jgrapht.ext;

import java.io.*;

import java.util.*;

import junit.framework.*;

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


/**
 * .
 *
 * @author Trevor Harmon
 */
public class DOTExporterTest
    extends TestCase
{
    //~ Static fields/initializers ---------------------------------------------

    private static final String V1 = "v1";
    private static final String V2 = "v2";
    private static final String V3 = "v3";

    private static final String NL = System.getProperty("line.separator");

    // TODO jvs 23-Dec-2006:  externalized diff-based testing framework

    private static final String UNDIRECTED =
        "graph G {" + NL
        + "  1;" + NL
        + "  2;" + NL
        + "  3;" + NL
        + "  1 -- 2;" + NL
        + "  3 -- 1;" + NL
        + "}" + NL;

    private static final DOTExporter<String, DefaultEdge> exporter =
        new DOTExporter<String, DefaultEdge>();

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

    public void testUndirected()
    {
        UndirectedGraph<String, DefaultEdge> g =
            new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);
        g.addVertex(V1);
        g.addVertex(V2);
        g.addEdge(V1, V2);
        g.addVertex(V3);
        g.addEdge(V3, V1);

        StringWriter w = new StringWriter();
        exporter.export(w, g);
        assertEquals(UNDIRECTED, w.toString());
    }

    public void testValidNodeIDs()
    {
        DOTExporter<String, DefaultEdge> exporter =
            new DOTExporter<String, DefaultEdge>(
                new StringNameProvider<String>(),
                null,
                null);

        List<String> validVertices =
            Arrays.asList(
                "-9.78",
                "-.5",
                "12",
                "a",
                "12",
                "abc_78",
                "\"--34asdf\"");
        for (String vertex : validVertices) {
            Graph<String, DefaultEdge> graph =
                new DefaultDirectedGraph<String, DefaultEdge>(
                    DefaultEdge.class);
            graph.addVertex(vertex);

            exporter.export(new StringWriter(), graph);
        }

        List<String> invalidVertices =
            Arrays.asList("2test", "--4", "foo-bar", "", "t:32");
        for (String vertex : invalidVertices) {
            Graph<String, DefaultEdge> graph =
                new DefaultDirectedGraph<String, DefaultEdge>(
                    DefaultEdge.class);
            graph.addVertex(vertex);

            try {
                exporter.export(new StringWriter(), graph);
                Assert.fail(vertex);
            } catch (RuntimeException re) {
                // this is a negative test so exception is expected
            }
        }
    }
}

// End DOTExporterTest.java
