jfreechart example source code file (MovingAverageTests.java)

This example jfreechart source code file (MovingAverageTests.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

average, day, day, epsilon, epsilon, moving, movingaveragetests, movingaveragetests, series, test, testcase, timeseries, timeseries

The jfreechart MovingAverageTests.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.]
 *
 * -----------------------
 * MovingAverageTests.java
 * -----------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 14-Aug-2003 : Version 1 (DG);
 * 04-Oct-2004 : Eliminated NumberUtils usage (DG);
 *
 */

package org.jfree.data.time.junit;

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

import org.jfree.data.time.Day;
import org.jfree.data.time.MovingAverage;
import org.jfree.data.time.TimeSeries;
import org.jfree.date.MonthConstants;

/**
 * Tests for the {@link MovingAverage} class.
 */
public class MovingAverageTests extends TestCase {

    private static final double EPSILON = 0.0000000001;

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

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

    /**
     * A test for the values calculated from a time series.
     */
    public void test1() {
        TimeSeries source = createDailyTimeSeries1();
        TimeSeries maverage = MovingAverage.createMovingAverage(
            source, "Moving Average", 3, 3
        );

        // the moving average series has 7 items, the first three
        // days (11, 12, 13 August are skipped)
        assertEquals(7, maverage.getItemCount());
        double value = maverage.getValue(0).doubleValue();
        assertEquals(14.1, value, EPSILON);
        value = maverage.getValue(1).doubleValue();
        assertEquals(13.4, value, EPSILON);
        value = maverage.getValue(2).doubleValue();
        assertEquals(14.433333333333, value, EPSILON);
        value = maverage.getValue(3).doubleValue();
        assertEquals(14.933333333333, value, EPSILON);
        value = maverage.getValue(4).doubleValue();
        assertEquals(19.8, value, EPSILON);
        value = maverage.getValue(5).doubleValue();
        assertEquals(15.25, value, EPSILON);
        value = maverage.getValue(6).doubleValue();
        assertEquals(12.5, value, EPSILON);
    }

    /**
     * Creates a sample series.
     *
     * @return A sample series.
     */
    private TimeSeries createDailyTimeSeries1() {

        TimeSeries series = new TimeSeries("Series 1", Day.class);
        series.add(new Day(11, MonthConstants.AUGUST, 2003), 11.2);
        series.add(new Day(13, MonthConstants.AUGUST, 2003), 13.8);
        series.add(new Day(17, MonthConstants.AUGUST, 2003), 14.1);
        series.add(new Day(18, MonthConstants.AUGUST, 2003), 12.7);
        series.add(new Day(19, MonthConstants.AUGUST, 2003), 16.5);
        series.add(new Day(20, MonthConstants.AUGUST, 2003), 15.6);
        series.add(new Day(25, MonthConstants.AUGUST, 2003), 19.8);
        series.add(new Day(27, MonthConstants.AUGUST, 2003), 10.7);
        series.add(new Day(28, MonthConstants.AUGUST, 2003), 14.3);
        return series;

    }

}