jfreechart example source code file (DialBackgroundTests.java)

This example jfreechart source code file (DialBackgroundTests.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

awt, bytearrayoutputstream, bytearrayoutputstream, clonenotsupportedexception, dialbackground, dialbackground, dialbackgroundtests, exception, io, mydiallayerchangelistener, mydiallayerchangelistener, objectinput, objectoutput, objectoutputstream, standardgradientpainttransformer, standardgradientpainttransformer

The jfreechart DialBackgroundTests.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.]
 *
 * ------------------------
 * DialBackgroundTests.java
 * ------------------------
 * (C) Copyright 2006-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 03-Nov-2006 : Version 1 (DG);
 *
 */

package org.jfree.chart.plot.dial.junit;

import java.awt.Color;
import java.awt.GradientPaint;
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.plot.dial.DialBackground;
import org.jfree.ui.GradientPaintTransformType;
import org.jfree.ui.StandardGradientPaintTransformer;

/**
 * Tests for the {@link DialBackground} class.
 */
public class DialBackgroundTests extends TestCase {

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

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

    /**
     * Confirm that the equals method can distinguish all the required fields.
     */
    public void testEquals() {
        DialBackground b1 = new DialBackground();
        DialBackground b2 = new DialBackground();
        assertTrue(b1.equals(b2));

        // paint
        b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f,
                Color.yellow));
        assertFalse(b1.equals(b2));
        b2.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f,
                Color.yellow));
        assertTrue(b1.equals(b2));

        // gradient paint transformer
        b1.setGradientPaintTransformer(new StandardGradientPaintTransformer(
                GradientPaintTransformType.CENTER_VERTICAL));
        assertFalse(b1.equals(b2));
        b2.setGradientPaintTransformer(new StandardGradientPaintTransformer(
                GradientPaintTransformType.CENTER_VERTICAL));
        assertTrue(b1.equals(b2));

        // check an inherited attribute
        b1.setVisible(false);
        assertFalse(b1.equals(b2));
        b2.setVisible(false);
        assertTrue(b1.equals(b2));

    }

    /**
     * Two objects that are equal are required to return the same hashCode.
     */
    public void testHashCode() {
        DialBackground b1 = new DialBackground(Color.red);
        DialBackground b2 = new DialBackground(Color.red);
        assertTrue(b1.equals(b2));
        int h1 = b1.hashCode();
        int h2 = b2.hashCode();
        assertEquals(h1, h2);
    }

    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        // test default instance
        DialBackground b1 = new DialBackground();
        DialBackground b2 = null;
        try {
            b2 = (DialBackground) b1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(b1 != b2);
        assertTrue(b1.getClass() == b2.getClass());
        assertTrue(b1.equals(b2));

        // test a customised instance
        b1 = new DialBackground();
        b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f,
                Color.green));
        b1.setGradientPaintTransformer(new StandardGradientPaintTransformer(
                GradientPaintTransformType.CENTER_VERTICAL));
        b2 = null;
        try {
            b2 = (DialBackground) b1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(b1 != b2);
        assertTrue(b1.getClass() == b2.getClass());
        assertTrue(b1.equals(b2));

        // check that the listener lists are independent
        MyDialLayerChangeListener l1 = new MyDialLayerChangeListener();
        b1.addChangeListener(l1);
        assertTrue(b1.hasListener(l1));
        assertFalse(b2.hasListener(l1));
    }


    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        // test a default instance
        DialBackground b1 = new DialBackground();
        DialBackground b2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(b1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                    new ByteArrayInputStream(buffer.toByteArray()));
            b2 = (DialBackground) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(b1, b2);

        // test a customised instance
        b1 = new DialBackground();
        b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f,
                Color.green));
        b1.setGradientPaintTransformer(new StandardGradientPaintTransformer(
                GradientPaintTransformType.CENTER_VERTICAL));
        b2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(b1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                    new ByteArrayInputStream(buffer.toByteArray()));
            b2 = (DialBackground) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(b1, b2);
    }

}