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Java > Open Source Codes > org > jfree > chart > renderer > category > junit > LayeredBarRendererTests


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ----------------------------
28  * LayeredBarRendererTests.java
29  * ----------------------------
30  * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: LayeredBarRendererTests.java,v 1.1.2.1 2006/10/03 15:41:34 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 22-Oct-2003 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.chart.renderer.category.junit;
44
45 import java.io.ByteArrayInputStream JavaDoc;
46 import java.io.ByteArrayOutputStream JavaDoc;
47 import java.io.ObjectInput JavaDoc;
48 import java.io.ObjectInputStream JavaDoc;
49 import java.io.ObjectOutput JavaDoc;
50 import java.io.ObjectOutputStream JavaDoc;
51
52 import junit.framework.Test;
53 import junit.framework.TestCase;
54 import junit.framework.TestSuite;
55
56 import org.jfree.chart.JFreeChart;
57 import org.jfree.chart.axis.CategoryAxis;
58 import org.jfree.chart.axis.NumberAxis;
59 import org.jfree.chart.plot.CategoryPlot;
60 import org.jfree.chart.renderer.category.LayeredBarRenderer;
61 import org.jfree.data.category.DefaultCategoryDataset;
62
63 /**
64  * Tests for the {@link LayeredBarRenderer} class.
65  */
66 public class LayeredBarRendererTests extends TestCase {
67
68     /**
69      * Returns the tests as a test suite.
70      *
71      * @return The test suite.
72      */
73     public static Test suite() {
74         return new TestSuite(LayeredBarRendererTests.class);
75     }
76
77     /**
78      * Constructs a new set of tests.
79      *
80      * @param name the name of the tests.
81      */
82     public LayeredBarRendererTests(String JavaDoc name) {
83         super(name);
84     }
85
86     /**
87      * Check that the equals() method distinguishes all fields.
88      */
89     public void testEquals() {
90         LayeredBarRenderer r1 = new LayeredBarRenderer();
91         LayeredBarRenderer r2 = new LayeredBarRenderer();
92         assertEquals(r1, r2);
93     }
94
95     /**
96      * Two objects that are equal are required to return the same hashCode.
97      */
98     public void testHashcode() {
99         LayeredBarRenderer r1 = new LayeredBarRenderer();
100         LayeredBarRenderer r2 = new LayeredBarRenderer();
101         assertTrue(r1.equals(r2));
102         int h1 = r1.hashCode();
103         int h2 = r2.hashCode();
104         assertEquals(h1, h2);
105     }
106     
107     /**
108      * Confirm that cloning works.
109      */
110     public void testCloning() {
111         LayeredBarRenderer r1 = new LayeredBarRenderer();
112         LayeredBarRenderer r2 = null;
113         try {
114             r2 = (LayeredBarRenderer) r1.clone();
115         }
116         catch (CloneNotSupportedException JavaDoc e) {
117             System.err.println("Failed to clone.");
118         }
119         assertTrue(r1 != r2);
120         assertTrue(r1.getClass() == r2.getClass());
121         assertTrue(r1.equals(r2));
122     }
123
124     /**
125      * Serialize an instance, restore it, and check for equality.
126      */
127     public void testSerialization() {
128
129         LayeredBarRenderer r1 = new LayeredBarRenderer();
130         LayeredBarRenderer r2 = null;
131
132         try {
133             ByteArrayOutputStream JavaDoc buffer = new ByteArrayOutputStream JavaDoc();
134             ObjectOutput JavaDoc out = new ObjectOutputStream JavaDoc(buffer);
135             out.writeObject(r1);
136             out.close();
137
138             ObjectInput JavaDoc in = new ObjectInputStream JavaDoc(
139                 new ByteArrayInputStream JavaDoc(buffer.toByteArray())
140             );
141             r2 = (LayeredBarRenderer) in.readObject();
142             in.close();
143         }
144         catch (Exception JavaDoc e) {
145             System.out.println(e.toString());
146         }
147         assertEquals(r1, r2);
148
149     }
150
151     /**
152      * Draws the chart with a <code>null</code> info object to make sure that
153      * no exceptions are thrown (particularly by code in the renderer).
154      */
155     public void testDrawWithNullInfo() {
156         boolean success = false;
157         try {
158             DefaultCategoryDataset dataset = new DefaultCategoryDataset();
159             dataset.addValue(1.0, "S1", "C1");
160             CategoryPlot plot = new CategoryPlot(dataset,
161                     new CategoryAxis("Category"), new NumberAxis("Value"),
162                     new LayeredBarRenderer());
163             JFreeChart chart = new JFreeChart(plot);
164             /* BufferedImage image = */ chart.createBufferedImage(300, 200,
165                     null);
166             success = true;
167         }
168         catch (NullPointerException JavaDoc e) {
169             e.printStackTrace();
170             success = false;
171         }
172         assertTrue(success);
173     }
174
175 }
176
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