chartpaneltests.java

制作图表的好工具

/* ===========================================================
 * 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.]
 *
 * --------------------
 * ChartPanelTests.java
 * --------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: ChartPanelTests.java,v 1.2.2.2 2005/11/25 14:11:00 mungady Exp $
 *
 * Changes
 * -------
 * 13-Jul-2004 : Version 1 (DG);
 *
 */

package org.jfree.chart.junit;

import java.util.EventListener;

import javax.swing.event.CaretListener;

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

import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.XYPlot;

/**
 * Tests for the {@link ChartPanel} class.
 */
public class ChartPanelTests extends TestCase implements ChartMouseListener {

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

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public ChartPanelTests(String name) {
        super(name);
    }

    /**
     * Test that the constructor will accept a null chart.
     */
    public void testConstructor1() {
        ChartPanel panel = new ChartPanel(null); 
        assertEquals(null, panel.getChart());
    }
    
    /**
     * Test that it is possible to set the panel's chart to null.
     */
    public void testSetChart() {
        JFreeChart chart = new JFreeChart(new XYPlot());
        ChartPanel panel = new ChartPanel(chart);
        panel.setChart(null);
        assertEquals(null, panel.getChart());
    }
    
    /**
     * Check the behaviour of the getListeners() method.
     */
    public void testGetListeners() {
        ChartPanel p = new ChartPanel(null);
        p.addChartMouseListener(this);
        EventListener[] listeners = p.getListeners(ChartMouseListener.class);
        assertEquals(1, listeners.length);
        assertEquals(this, listeners[0]);
        // try a listener type that isn't registered
        listeners = p.getListeners(CaretListener.class);
        assertEquals(0, listeners.length);
        p.removeChartMouseListener(this);
        listeners = p.getListeners(ChartMouseListener.class);
        assertEquals(0, listeners.length);
    
        // try a null argument
        boolean pass = false;
        try {
            listeners = p.getListeners(null);
        }
        catch (NullPointerException e) {
            pass = true;    
        }
        assertTrue(pass);
    
        // try a class that isn't a listener
        pass = false;
        try {
            listeners = p.getListeners(Integer.class);
        }
        catch (ClassCastException e) {
            pass = true;
        }
        assertTrue(pass);
    }

    public void chartMouseClicked(ChartMouseEvent event) {
        // ignore
    }

    public void chartMouseMoved(ChartMouseEvent event) {
        // ignore
    }

}