jfreechart example source code file (PieChartTests.java)

This example jfreechart source code file (PieChartTests.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jfreechart tags/keywords

chart, chartchangelistener, defaultpiedataset, jfreechart, jfreechart, locallistener, locallistener, piecharttests, piecharttests, pieplot, pieplot, test, testcase, visual

The jfreechart PieChartTests.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * ------------------
 * PieChartTests.java
 * ------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 11-Jun-2002 : Version 1 (DG);
 * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.chart.junit;

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

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;

/**
 * Tests for a pie chart.
 *
 */
public class PieChartTests extends TestCase {

    /** A chart. */
    private JFreeChart pieChart;

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

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

    /**
     * Common test setup.
     */
    protected void setUp() {

        this.pieChart = createPieChart();

    }

    /**
     * Using a regular pie chart, we replace the dataset with null.  Expect to
     * receive notification of a chart change event, and (of course) the
     * dataset should be null.
     */
    public void testReplaceDatasetOnPieChart() {
        LocalListener l = new LocalListener();
        this.pieChart.addChangeListener(l);
        PiePlot plot = (PiePlot) this.pieChart.getPlot();
        plot.setDataset(null);
        assertEquals(true, l.flag);
        assertNull(plot.getDataset());
    }

    /**
     * Creates a pie chart.
     *
     * @return The pie chart.
     */
    private static JFreeChart createPieChart() {
        // create a dataset...
        DefaultPieDataset data = new DefaultPieDataset();
        data.setValue("Java", new Double(43.2));
        data.setValue("Visual Basic", new Double(0.0));
        data.setValue("C/C++", new Double(17.5));

        // create the chart...
        return ChartFactory.createPieChart("Pie Chart",  // chart title
                                           data,         // data
                                           true,         // include legend
                                           true,
                                           false
                                           );
    }

    /**
     * A chart change listener.
     *
     */
    static class LocalListener implements ChartChangeListener {

        /** A flag. */
        private boolean flag = false;

        /**
         * Event handler.
         *
         * @param event  the event.
         */
        public void chartChanged(ChartChangeEvent event) {
            this.flag = true;
        }

    }

}