standardcategoryitemlabelgeneratortests.java

jfreechart1.0.1 jsp绘制图表的开发包

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ----------------------------------------
 * StandardCategoryLabelGeneratorTests.java
 * ----------------------------------------
 * (C) Copyright 2003, 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: StandardCategoryItemLabelGeneratorTests.java,v 1.1.2.1 2005/10/25 20:49:19 mungady Exp $
 *
 * Changes
 * -------
 * 21-Mar-2003 : Version 1 (DG);
 * 13-Aug-2003 : Added cloning tests (DG);
 * 11-May-2004 : Renamed class (DG);
 *
 */

package org.jfree.chart.labels.junit;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.data.category.DefaultCategoryDataset;

/**
 * Tests for the {@link StandardCategoryItemLabelGenerator} class.
 */
public class StandardCategoryItemLabelGeneratorTests extends TestCase {

    /**
     * Returns the tests as a test suite.
     *
     * @return The test suite.
     */
    public static Test suite() {
        return new TestSuite(StandardCategoryItemLabelGeneratorTests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public StandardCategoryItemLabelGeneratorTests(String name) {
        super(name);
    }
    
    public void testGenerateLabel() {
        StandardCategoryItemLabelGenerator g 
            = new StandardCategoryItemLabelGenerator("{2}", new DecimalFormat("0.000"));
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(1.0, "R0", "C0");
        dataset.addValue(2.0, "R0", "C1");
        dataset.addValue(3.0, "R1", "C0");
        dataset.addValue(null, "R1", "C1");
        String s = g.generateLabel(dataset, 0, 0);
        assertEquals("1.000", s);
        
        // try a null value
        s = g.generateLabel(dataset, 1, 1);
        assertEquals("-", s);
    }
    
    /**
     * Some checks for the equals() method.
     */
    public void testEquals() {
        
        StandardCategoryItemLabelGenerator g1 
            = new StandardCategoryItemLabelGenerator();
        StandardCategoryItemLabelGenerator g2 
            = new StandardCategoryItemLabelGenerator();
        assertTrue(g1.equals(g2));
        assertTrue(g2.equals(g1));
        
        g1 = new StandardCategoryItemLabelGenerator(
            "{0}", new DecimalFormat("0.000")
        );
        assertFalse(g1.equals(g2));
        g2 = new StandardCategoryItemLabelGenerator(
            "{0}", new DecimalFormat("0.000")
        );
        assertTrue(g1.equals(g2));

        g1 = new StandardCategoryItemLabelGenerator(
            "{1}", new DecimalFormat("0.000")
        );
        assertFalse(g1.equals(g2));
        g2 = new StandardCategoryItemLabelGenerator(
            "{1}", new DecimalFormat("0.000")
        );
        assertTrue(g1.equals(g2));

        g1 = new StandardCategoryItemLabelGenerator(
            "{2}", new SimpleDateFormat("d-MMM")
        );
        assertFalse(g1.equals(g2));
        g2 = new StandardCategoryItemLabelGenerator(
            "{2}", new SimpleDateFormat("d-MMM")
        );
        assertTrue(g1.equals(g2));
        
    }

    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        StandardCategoryItemLabelGenerator g1 
            = new StandardCategoryItemLabelGenerator();
        StandardCategoryItemLabelGenerator g2 = null;
        try {
            g2 = (StandardCategoryItemLabelGenerator) g1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(g1 != g2);
        assertTrue(g1.getClass() == g2.getClass());
        assertTrue(g1.equals(g2));
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {

        StandardCategoryItemLabelGenerator g1
            = new StandardCategoryItemLabelGenerator(
                "{2}", DateFormat.getInstance()
            );
        StandardCategoryItemLabelGenerator g2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(g1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            g2 = (StandardCategoryItemLabelGenerator) in.readObject();
            in.close();
        }
        catch (Exception e) {
            System.out.println(e.toString());
        }
        assertEquals(g1, g2);

    }

}