SimpleHistogramDatasetTests.java

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2011, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * --------------------------------
 * SimpleHistogramDatasetTests.java
 * --------------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 10-Jan-2005 : Version 1 (DG);
 * 21-May-2007 : Added testClearObservations (DG);
 *
 */

package org.jfree.data.statistics.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.statistics.SimpleHistogramBin;
import org.jfree.data.statistics.SimpleHistogramDataset;

/**
 * Tests for the {@link SimpleHistogramDataset} class.
 */
public class SimpleHistogramDatasetTests extends TestCase {

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

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

    /**
     * Ensure that the equals() method can distinguish all fields.
     */
    public void testEquals() {
        SimpleHistogramDataset d1 = new SimpleHistogramDataset("Dataset 1");
        SimpleHistogramDataset d2 = new SimpleHistogramDataset("Dataset 1");
        assertTrue(d1.equals(d2));

        d1.addBin(new SimpleHistogramBin(1.0, 2.0));
        assertFalse(d1.equals(d2));
        d2.addBin(new SimpleHistogramBin(1.0, 2.0));
        assertTrue(d1.equals(d2));
    }

    /**
     * Some checks for the clone() method.
     */
    public void testCloning() {
        SimpleHistogramDataset d1 = new SimpleHistogramDataset("Dataset 1");
        SimpleHistogramDataset d2 = null;
        try {
            d2 = (SimpleHistogramDataset) d1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(d1 != d2);
        assertTrue(d1.getClass() == d2.getClass());
        assertTrue(d1.equals(d2));

        // check that clone is independent of the original
        d2.addBin(new SimpleHistogramBin(2.0, 3.0));
        d2.addObservation(2.3);
        assertFalse(d1.equals(d2));
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        SimpleHistogramDataset d1 = new SimpleHistogramDataset("D1");
        SimpleHistogramDataset d2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(d1);
            out.close();
            ObjectInput in = new ObjectInputStream(
                    new ByteArrayInputStream(buffer.toByteArray()));
            d2 = (SimpleHistogramDataset) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(d1, d2);
    }

    private static final double EPSILON = 0.0000000001;

    /**
     * Some checks for the clearObservations() method.
     */
    public void testClearObservations() {
        SimpleHistogramDataset d1 = new SimpleHistogramDataset("D1");
        d1.clearObservations();
        assertEquals(0, d1.getItemCount(0));
        d1.addBin(new SimpleHistogramBin(0.0, 1.0));
        d1.addObservation(0.5);
        assertEquals(1.0, d1.getYValue(0, 0), EPSILON);
    }

    /**
     * Some checks for the removeAllBins() method.
     */
    public void testRemoveAllBins() {
        SimpleHistogramDataset d1 = new SimpleHistogramDataset("D1");
        d1.addBin(new SimpleHistogramBin(0.0, 1.0));
        d1.addObservation(0.5);
        d1.addBin(new SimpleHistogramBin(2.0, 3.0));
        assertEquals(2, d1.getItemCount(0));
        d1.removeAllBins();
        assertEquals(0, d1.getItemCount(0));
    }

}