jfreechart example source code file (RangeTests.java)

This example jfreechart source code file (RangeTests.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, bytearrayoutputstream, exception, exception, io, lower, null, null, objectinput, range, range, rangetests, serialization, test, testcase

The jfreechart RangeTests.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.]
 *
 * ---------------
 * RangeTests.java
 * ---------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Sergei Ivanov;
 *
 * Changes
 * -------
 * 14-Aug-2003 : Version 1 (DG);
 * 18-Dec-2007 : Additional tests from Sergei Ivanov (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 junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.jfree.data.Range;

/**
 * Tests for the {@link Range} class.
 */
public class RangeTests extends TestCase {

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

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

    /**
     * Confirm that the constructor initializes all the required fields.
     */
    public void testConstructor() {
        Range r1 = new Range(0.1, 1000.0);
        assertEquals(r1.getLowerBound(), 0.1, 0.0d);
        assertEquals(r1.getUpperBound(), 1000.0, 0.0d);

        try {
            /*Range r2 =*/ new Range(10.0, 0.0);
            fail("Lower bound cannot be greater than the upper");
        }
        catch (Exception e) {
            // ignore
        }
    }

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

        Range r1 = new Range(0.0, 1.0);
        Range r2 = new Range(0.0, 1.0);
        assertEquals(r1, r2);
        assertEquals(r2, r1);

        r1 = new Range(0.0, 1.0);
        r2 = new Range(0.5, 1.0);
        assertFalse(r1.equals(r2));

        r1 = new Range(0.0, 1.0);
        r2 = new Range(0.0, 2.0);
        assertFalse(r1.equals(r2));

        assertFalse(r1.equals(new Double(0.0)));
    }

    /**
     * Two objects that are equal are required to return the same hashCode.
     */
    public void testHashCode() {
        Range a1 = new Range(1.0, 100.0);
        Range a2 = new Range(1.0, 100.0);
        assertEquals(a1.hashCode(), a2.hashCode());

        a1 = new Range(-100.0, 2.0);
        a2 = new Range(-100.0, 2.0);
        assertEquals(a1.hashCode(), a2.hashCode());
    }

    /**
     * Simple tests for the contains() method.
     */
    public void testContains() {
        Range r1 = new Range(0.0, 1.0);
        assertFalse(r1.contains(Double.NaN));
        assertFalse(r1.contains(Double.NEGATIVE_INFINITY));
        assertFalse(r1.contains(-1.0));
        assertTrue(r1.contains(0.0));
        assertTrue(r1.contains(0.5));
        assertTrue(r1.contains(1.0));
        assertFalse(r1.contains(2.0));
        assertFalse(r1.contains(Double.POSITIVE_INFINITY));
    }

    /**
     * Tests the constrain() method for various values.
     */
    public void testConstrain() {
        Range r1 = new Range(0.0, 1.0);

        double d = r1.constrain(0.5);
        assertEquals(0.5, d, 0.0000001);

        d = r1.constrain(0.0);
        assertEquals(0.0, d, 0.0000001);

        d = r1.constrain(1.0);
        assertEquals(1.0, d, 0.0000001);

        d = r1.constrain(-1.0);
        assertEquals(0.0, d, 0.0000001);

        d = r1.constrain(2.0);
        assertEquals(1.0, d, 0.0000001);

        d = r1.constrain(Double.POSITIVE_INFINITY);
        assertEquals(1.0, d, 0.0000001);

        d = r1.constrain(Double.NEGATIVE_INFINITY);
        assertEquals(0.0, d, 0.0000001);

        d = r1.constrain(Double.NaN);
        assertTrue(Double.isNaN(d));
    }

    /**
     * Simple tests for the intersects() method.
     */
    public void testIntersects() {
        Range r1 = new Range(0.0, 1.0);
        assertFalse(r1.intersects(-2.0, -1.0));
        assertFalse(r1.intersects(-2.0, 0.0));
        assertTrue(r1.intersects(-2.0, 0.5));
        assertTrue(r1.intersects(-2.0, 1.0));
        assertTrue(r1.intersects(-2.0, 1.5));
        assertTrue(r1.intersects(0.0, 0.5));
        assertTrue(r1.intersects(0.0, 1.0));
        assertTrue(r1.intersects(0.0, 1.5));
        assertTrue(r1.intersects(0.5, 0.6));
        assertTrue(r1.intersects(0.5, 1.0));
        assertTrue(r1.intersects(0.5, 1.5));
        assertFalse(r1.intersects(1.0, 1.1));
        assertFalse(r1.intersects(1.5, 2.0));
    }

    /**
     * A simple test for the expand() method.
     */
    public void testExpand() {
        Range r1 = new Range(0.0, 100.0);
        Range r2 = Range.expand(r1, 0.10, 0.10);
        assertEquals(-10.0, r2.getLowerBound(), 0.001);
        assertEquals(110.0, r2.getUpperBound(), 0.001);

        // Expand by 0% does not change the range
        r2 = Range.expand(r1, 0.0, 0.0);
        assertEquals(r1, r2);

        try {
            Range.expand(null, 0.1, 0.1);
            fail("Null value is accepted");
        }
        catch (Exception e) {
        }

        // Lower > upper: mid point is used
        r2 = Range.expand(r1, -0.8, -0.5);
        assertEquals(65.0, r2.getLowerBound(), 0.001);
        assertEquals(65.0, r2.getUpperBound(), 0.001);
    }

    /**
     * A simple test for the scale() method.
     */
    public void testShift() {
        Range r1 = new Range(10.0, 20.0);
        Range r2 = Range.shift(r1, 20.0);
        assertEquals(30.0, r2.getLowerBound(), 0.001);
        assertEquals(40.0, r2.getUpperBound(), 0.001);

        r1 = new Range(0.0, 100.0);
        r2 = Range.shift(r1, -50.0, true);
        assertEquals(-50.0, r2.getLowerBound(), 0.001);
        assertEquals(50.0, r2.getUpperBound(), 0.001);

        r1 = new Range(-10.0, 20.0);
        r2 = Range.shift(r1, 20.0, true);
        assertEquals(10.0, r2.getLowerBound(), 0.001);
        assertEquals(40.0, r2.getUpperBound(), 0.001);

        r1 = new Range(-10.0, 20.0);
        r2 = Range.shift(r1, -30.0, true);
        assertEquals(-40.0, r2.getLowerBound(), 0.001);
        assertEquals(-10.0, r2.getUpperBound(), 0.001);

        r1 = new Range(-10.0, 20.0);
        r2 = Range.shift(r1, 20.0, false);
        assertEquals(0.0, r2.getLowerBound(), 0.001);
        assertEquals(40.0, r2.getUpperBound(), 0.001);

        r1 = new Range(-10.0, 20.0);
        r2 = Range.shift(r1, -30.0, false);
        assertEquals(-40.0, r2.getLowerBound(), 0.001);
        assertEquals(0.0, r2.getUpperBound(), 0.001);

        // Shifting with a delta of 0 does not change the range
        r2 = Range.shift(r1, 0.0);
        assertEquals(r1, r2);

        try {
            Range.shift(null, 0.1);
            fail("Null value is accepted");
        }
        catch (Exception e) {
        }
    }

    /**
     * A simple test for the scale() method.
     */
    public void testScale() {
        Range r1 = new Range(0.0, 100.0);
        Range r2 = Range.scale(r1, 0.10);
        assertEquals(0.0, r2.getLowerBound(), 0.001);
        assertEquals(10.0, r2.getUpperBound(), 0.001);

        r1 = new Range(-10.0, 100.0);
        r2 = Range.scale(r1, 2.0);
        assertEquals(-20.0, r2.getLowerBound(), 0.001);
        assertEquals(200.0, r2.getUpperBound(), 0.001);

        // Scaling with a factor of 1 does not change the range
        r2 = Range.scale(r1, 1.0);
        assertEquals(r1, r2);

        try {
            Range.scale(null, 0.1);
            fail("Null value is accepted");
        }
        catch (Exception e) {
        }

        try {
            Range.scale(r1, -0.5);
            fail("Negative factor accepted");
        }
        catch (Exception e) {
        }
    }

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

        Range r1 = new Range(25.0, 133.42);
        Range 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 = (Range) in.readObject();
            in.close();
        }
        catch (Exception e) {
            System.out.println(e.toString());
            fail("Serialization is not supported");
        }
        assertEquals(r1, r2);

    }

}