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jfreechart example source code file (XYTitleAnnotationTests.java)

This example jfreechart source code file (XYTitleAnnotationTests.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

bytearrayoutputstream, io, jfreechart, numberaxis, series, texttitle, texttitle, title, title, xyplot, xyseries, xyseries, xytitleannotation, xytitleannotation, xytitleannotationtests

The jfreechart XYTitleAnnotationTests.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.]
 *
 * ---------------------------
 * XYTitleAnnotationTests.java
 * ---------------------------
 * (C) Copyright 2007, 2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 30-Apr-2007 : Version 1 (DG);
 * 26-Feb-2008 : Added testDrawWithNullInfo() (DG);
 *
 */

package org.jfree.chart.annotations.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 junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.annotations.XYTitleAnnotation;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.xy.DefaultTableXYDataset;
import org.jfree.data.xy.XYSeries;

/**
 * Tests for the {@link XYTitleAnnotation} class.
 */
public class XYTitleAnnotationTests extends TestCase {

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

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

    /**
     * Confirm that the equals method can distinguish all the required fields.
     */
    public void testEquals() {
        TextTitle t = new TextTitle("Title");
        XYTitleAnnotation a1 = new XYTitleAnnotation(1.0, 2.0, t);
        XYTitleAnnotation a2 = new XYTitleAnnotation(1.0, 2.0, t);
        assertTrue(a1.equals(a2));
        
        a1 = new XYTitleAnnotation(1.1, 2.0, t);
        assertFalse(a1.equals(a2));
        a2 = new XYTitleAnnotation(1.1, 2.0, t);
        assertTrue(a1.equals(a2));

        a1 = new XYTitleAnnotation(1.1, 2.2, t);
        assertFalse(a1.equals(a2));
        a2 = new XYTitleAnnotation(1.1, 2.2, t);
        assertTrue(a1.equals(a2));
        
        TextTitle t2 = new TextTitle("Title 2");
        a1 = new XYTitleAnnotation(1.1, 2.2, t2);
        assertFalse(a1.equals(a2));
        a2 = new XYTitleAnnotation(1.1, 2.2, t2);
        assertTrue(a1.equals(a2));
    }

    /**
     * Two objects that are equal are required to return the same hashCode. 
     */
    public void testHashCode() {
        TextTitle t = new TextTitle("Title");
        XYTitleAnnotation a1 = new XYTitleAnnotation(1.0, 2.0, t);
        XYTitleAnnotation a2 = new XYTitleAnnotation(1.0, 2.0, t);
        assertTrue(a1.equals(a2));
        int h1 = a1.hashCode();
        int h2 = a2.hashCode();
        assertEquals(h1, h2);
    }
    
    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        TextTitle t = new TextTitle("Title");
        XYTitleAnnotation a1 = new XYTitleAnnotation(1.0, 2.0, t);
        XYTitleAnnotation a2 = null;
        try {
            a2 = (XYTitleAnnotation) a1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(a1 != a2);
        assertTrue(a1.getClass() == a2.getClass());
        assertTrue(a1.equals(a2));
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        TextTitle t = new TextTitle("Title");
        XYTitleAnnotation a1 = new XYTitleAnnotation(1.0, 2.0, t);
        XYTitleAnnotation a2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(a1);
            out.close();

            ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(
                    buffer.toByteArray()));
            a2 = (XYTitleAnnotation) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(a1, a2);
    }
    
    /**
     * Draws the chart with a <code>null info object to make sure that 
     * no exceptions are thrown.
     */
    public void testDrawWithNullInfo() {
        boolean success = false;
        try {
            DefaultTableXYDataset dataset = new DefaultTableXYDataset();
        
            XYSeries s1 = new XYSeries("Series 1", true, false);
            s1.add(5.0, 5.0);
            s1.add(10.0, 15.5);
            s1.add(15.0, 9.5);
            s1.add(20.0, 7.5);
            dataset.addSeries(s1);
        
            XYSeries s2 = new XYSeries("Series 2", true, false);
            s2.add(5.0, 5.0);
            s2.add(10.0, 15.5);
            s2.add(15.0, 9.5);
            s2.add(20.0, 3.5);
            dataset.addSeries(s2);
            XYPlot plot = new XYPlot(dataset, 
                    new NumberAxis("X"), new NumberAxis("Y"), 
                    new XYLineAndShapeRenderer());
            plot.addAnnotation(new XYTitleAnnotation(5.0, 6.0, 
                    new TextTitle("Hello World!")));
            JFreeChart chart = new JFreeChart(plot);
            /* BufferedImage image = */ chart.createBufferedImage(300, 200, 
                    null);
            success = true;
        }
        catch (NullPointerException e) {
            e.printStackTrace();
            success = false;
        }
        assertTrue(success);
    }

}

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