Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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.] * * ------------------------- * HistogramDatasetTest.java * ------------------------- * (C) Copyright 2004-2013, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes * ------- * 01-Mar-2004 : Version 1 (DG); * 08-Jun-2005 : Added test for getSeriesKey(int) bug (DG); * 03-Aug-2006 : Added testAddSeries() and testBinBoundaries() method (DG); * 22-May-2008 : Added testAddSeries2() and enhanced testCloning() (DG); * 08-Dec-2009 : Added test2902842() for patch at SourceForge (DG); * */ package org.jfree.data.statistics; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertTrue; import static org.junit.Assert.assertFalse; import static org.junit.Assert.assertNotNull; import org.jfree.chart.TestUtilities; import org.jfree.data.general.DatasetChangeEvent; import org.jfree.data.general.DatasetChangeListener; import org.junit.Test; /** * Tests for the {@link HistogramDataset} class. */ public class HistogramDatasetTest implements DatasetChangeListener { private static final double EPSILON = 0.0000000001; /** * Some checks that the correct values are assigned to bins. */ @Test public void testBins() { double[] values = { 1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5 }; HistogramDataset hd = new HistogramDataset(); hd.addSeries("Series 1", values, 5); assertEquals(hd.getYValue(0, 0), 3.0, EPSILON); assertEquals(hd.getYValue(0, 1), 3.0, EPSILON); assertEquals(hd.getYValue(0, 2), 2.0, EPSILON); assertEquals(hd.getYValue(0, 3), 0.0, EPSILON); assertEquals(hd.getYValue(0, 4), 1.0, EPSILON); } /** * Confirm that the equals method can distinguish all the required fields. */ @Test public void testEquals() { double[] values = { 1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5 }; HistogramDataset d1 = new HistogramDataset(); d1.addSeries("Series 1", values, 5); HistogramDataset d2 = new HistogramDataset(); d2.addSeries("Series 1", values, 5); assertTrue(d1.equals(d2)); assertTrue(d2.equals(d1)); d1.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertFalse(d1.equals(d2)); d2.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertTrue(d1.equals(d2)); } /** * Confirm that cloning works. */ @Test public void testCloning() throws CloneNotSupportedException { double[] values = { 1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5 }; HistogramDataset d1 = new HistogramDataset(); d1.addSeries("Series 1", values, 5); HistogramDataset d2 = (HistogramDataset) d1.clone(); assertTrue(d1 != d2); assertTrue(d1.getClass() == d2.getClass()); assertTrue(d1.equals(d2)); // simple check for independence d1.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertFalse(d1.equals(d2)); d2.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertTrue(d1.equals(d2)); } /** * Serialize an instance, restore it, and check for equality. */ @Test public void testSerialization() { double[] values = { 1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5 }; HistogramDataset d1 = new HistogramDataset(); d1.addSeries("Series 1", values, 5); HistogramDataset d2 = (HistogramDataset) TestUtilities.serialised(d1); assertEquals(d1, d2); // simple check for independence d1.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertFalse(d1.equals(d2)); d2.addSeries("Series 2", new double[] { 1.0, 2.0, 3.0 }, 2); assertTrue(d1.equals(d2)); } /** * A test for a bug reported in the forum where the series name isn't being * returned correctly. */ @Test public void testGetSeriesKey() { double[] values = { 1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5 }; HistogramDataset d1 = new HistogramDataset(); d1.addSeries("Series 1", values, 5); assertEquals("Series 1", d1.getSeriesKey(0)); } /** * Some checks for the addSeries() method. */ @Test public void testAddSeries() { double[] values = { -1.0, 0.0, 0.1, 0.9, 1.0, 1.1, 1.9, 2.0, 3.0 }; HistogramDataset d = new HistogramDataset(); d.addSeries("S1", values, 2, 0.0, 2.0); assertEquals(0.0, d.getStartXValue(0, 0), EPSILON); assertEquals(1.0, d.getEndXValue(0, 0), EPSILON); assertEquals(4.0, d.getYValue(0, 0), EPSILON); assertEquals(1.0, d.getStartXValue(0, 1), EPSILON); assertEquals(2.0, d.getEndXValue(0, 1), EPSILON); assertEquals(5.0, d.getYValue(0, 1), EPSILON); } /** * Another check for the addSeries() method. */ @Test public void testAddSeries2() { double[] values = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0 }; HistogramDataset hd = new HistogramDataset(); hd.addSeries("S1", values, 5); assertEquals(0.0, hd.getStartXValue(0, 0), EPSILON); assertEquals(1.0, hd.getEndXValue(0, 0), EPSILON); assertEquals(1.0, hd.getYValue(0, 0), EPSILON); assertEquals(1.0, hd.getStartXValue(0, 1), EPSILON); assertEquals(2.0, hd.getEndXValue(0, 1), EPSILON); assertEquals(1.0, hd.getYValue(0, 1), EPSILON); assertEquals(2.0, hd.getStartXValue(0, 2), EPSILON); assertEquals(3.0, hd.getEndXValue(0, 2), EPSILON); assertEquals(1.0, hd.getYValue(0, 2), EPSILON); assertEquals(3.0, hd.getStartXValue(0, 3), EPSILON); assertEquals(4.0, hd.getEndXValue(0, 3), EPSILON); assertEquals(1.0, hd.getYValue(0, 3), EPSILON); assertEquals(4.0, hd.getStartXValue(0, 4), EPSILON); assertEquals(5.0, hd.getEndXValue(0, 4), EPSILON); assertEquals(2.0, hd.getYValue(0, 4), EPSILON); } /** * This test is derived from a reported bug. */ @Test public void testBinBoundaries() { double[] values = { -5.000000000000286E-5 }; int bins = 1260; double minimum = -0.06307522528160199; double maximum = 0.06297522528160199; HistogramDataset d = new HistogramDataset(); d.addSeries("S1", values, bins, minimum, maximum); assertEquals(0.0, d.getYValue(0, 629), EPSILON); assertEquals(1.0, d.getYValue(0, 630), EPSILON); assertEquals(0.0, d.getYValue(0, 631), EPSILON); assertTrue(values[0] > d.getStartXValue(0, 630)); assertTrue(values[0] < d.getEndXValue(0, 630)); } /** * Some checks for bug 1553088. An IndexOutOfBoundsException is thrown * when a data value is *very* close to the upper limit of the last bin. */ @Test public void test1553088() { double[] values = { -1.0, 0.0, -Double.MIN_VALUE, 3.0 }; HistogramDataset d = new HistogramDataset(); d.addSeries("S1", values, 2, -1.0, 0.0); assertEquals(-1.0, d.getStartXValue(0, 0), EPSILON); assertEquals(-0.5, d.getEndXValue(0, 0), EPSILON); assertEquals(1.0, d.getYValue(0, 0), EPSILON); assertEquals(-0.5, d.getStartXValue(0, 1), EPSILON); assertEquals(0.0, d.getEndXValue(0, 1), EPSILON); assertEquals(3.0, d.getYValue(0, 1), EPSILON); } /** * A test to show the limitation addressed by patch 2902842. */ @Test public void test2902842() { this.lastEvent = null; double[] values = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0 }; HistogramDataset hd = new HistogramDataset(); hd.addChangeListener(this); hd.addSeries("S1", values, 5); assertNotNull(this.lastEvent); } /** * A reference to the last event received by the datasetChanged() method. */ private DatasetChangeEvent lastEvent; /** * Receives event notification. * * @param event the event. */ @Override public void datasetChanged(DatasetChangeEvent event) { this.lastEvent = event; } }