levelrenderertests.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 186 行

/* ===========================================================
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -----------------------
 * LevelRendererTests.java
 * -----------------------
 * (C) Copyright 2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: LevelRendererTests.java,v 1.1 2005/03/29 12:57:13 mungady Exp $
 *
 * Changes
 * -------
 * 29-Mar-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.renderer.category.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.renderer.category.LevelRenderer;

/**
 * Tests for the {@link LevelRenderer} class.
 */
public class LevelRendererTests extends TestCase {

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

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

    /**
     * Test that the equals() method distinguishes all fields.
     */
    public void testEquals() {
        LevelRenderer r1 = new LevelRenderer();
        LevelRenderer r2 = new LevelRenderer();
        assertTrue(r1.equals(r2));
        assertTrue(r2.equals(r1));
        
        r1.setItemMargin(0.123);
        assertFalse(r1.equals(r2));
        r2.setItemMargin(0.123);
        assertTrue(r1.equals(r2));

        r1.setMaxItemWidth(0.234);
        assertFalse(r1.equals(r2));
        r2.setMaxItemWidth(0.234);
        assertTrue(r1.equals(r2));
    
    }

    /**
     * Two objects that are equal are required to return the same hashCode. 
     */
    public void testHashcode() {
        LevelRenderer r1 = new LevelRenderer();
        LevelRenderer r2 = new LevelRenderer();
        assertTrue(r1.equals(r2));
        int h1 = r1.hashCode();
        int h2 = r2.hashCode();
        assertEquals(h1, h2);
    }
    
    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        LevelRenderer r1 = new LevelRenderer();
        r1.setItemMargin(0.123);
        r1.setMaxItemWidth(0.234);
        LevelRenderer r2 = null;
        try {
            r2 = (LevelRenderer) r1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(r1 != r2);
        assertTrue(r1.getClass() == r2.getClass());
        assertTrue(r1.equals(r2));
        
        assertTrue(checkIndependence(r1, r2));
        
    }

    /**
     * Checks that the two renderers are equal but independent of one another.
     * 
     * @param r1  renderer 1.
     * @param r2  renderer 2.
     * 
     * @return A boolean.
     */
    private boolean checkIndependence(LevelRenderer r1, LevelRenderer r2) {

        // should be equal...
        boolean b0 = r1.equals(r2);
        
        // and independent...
        r1.setItemMargin(0.0);
        boolean b1 = !r1.equals(r2);
        r2.setItemMargin(0.0);
        boolean b2 = r1.equals(r2);
        
        return b0 && b1 && b2;
    
    }
    
    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {

        LevelRenderer r1 = new LevelRenderer();
        LevelRenderer r2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(r1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            r2 = (LevelRenderer) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(r1, r2);

    }

}