jfreechart example source code file (KeyedObjectTests.java)

This example jfreechart source code file (KeyedObjectTests.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

arraylist, bytearrayoutputstream, clonenotsupportedexception, clonenotsupportedexception, defaultpiedataset, io, keyedobject, keyedobject, keyedobjecttests, object, object, objectinput, test, test, testcase, util

The jfreechart KeyedObjectTests.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.]
 *
 * ---------------------
 * KeyedObjectTests.java
 * ---------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 27-Jan-2004 : Version 1 (DG);
 * 28-Sep-2007 : Added testCloning2() (DG);
 *
 */

package org.jfree.data.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 java.util.ArrayList;

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

import org.jfree.data.KeyedObject;
import org.jfree.data.general.DefaultPieDataset;

/**
 * Tests for the {@link KeyedObject} class.
 */
public class KeyedObjectTests extends TestCase {

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

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

    /**
     * Confirm that the equals method can distinguish all the required fields.
     */
    public void testEquals() {

        KeyedObject ko1 = new KeyedObject("Test", "Object");
        KeyedObject ko2 = new KeyedObject("Test", "Object");
        assertTrue(ko1.equals(ko2));
        assertTrue(ko2.equals(ko1));

        ko1 = new KeyedObject("Test 1", "Object");
        ko2 = new KeyedObject("Test 2", "Object");
        assertFalse(ko1.equals(ko2));

        ko1 = new KeyedObject("Test", "Object 1");
        ko2 = new KeyedObject("Test", "Object 2");
        assertFalse(ko1.equals(ko2));

    }

    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        KeyedObject ko1 = new KeyedObject("Test", "Object");
        KeyedObject ko2 = null;
        try {
            ko2 = (KeyedObject) ko1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(ko1 != ko2);
        assertTrue(ko1.getClass() == ko2.getClass());
        assertTrue(ko1.equals(ko2));
    }

    /**
     * Confirm special features of cloning.
     */
    public void testCloning2() {
        // case 1 - object is mutable but not PublicCloneable
        Object obj1 = new ArrayList();
        KeyedObject ko1 = new KeyedObject("Test", obj1);
        KeyedObject ko2 = null;
        try {
            ko2 = (KeyedObject) ko1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(ko1 != ko2);
        assertTrue(ko1.getClass() == ko2.getClass());
        assertTrue(ko1.equals(ko2));

        // the clone contains a reference to the original object
        assertTrue(ko2.getObject() == obj1);

        // CASE 2 - object is mutable AND PublicCloneable
        obj1 = new DefaultPieDataset();
        ko1 = new KeyedObject("Test", obj1);
        ko2 = null;
        try {
            ko2 = (KeyedObject) ko1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(ko1 != ko2);
        assertTrue(ko1.getClass() == ko2.getClass());
        assertTrue(ko1.equals(ko2));

        // the clone contains a reference to a CLONE of the original object
        assertTrue(ko2.getObject() != obj1);
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {

        KeyedObject ko1 = new KeyedObject("Test", "Object");
        KeyedObject ko2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(ko1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            ko2 = (KeyedObject) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(ko1, ko2);

    }

}