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62 package org.jaxen.function;
63
64 import java.util.List;
65
66 import javax.xml.parsers.DocumentBuilder;
67 import javax.xml.parsers.DocumentBuilderFactory;
68 import javax.xml.parsers.ParserConfigurationException;
69
70 import junit.framework.TestCase;
71
72 import org.jaxen.FunctionCallException;
73 import org.jaxen.JaxenException;
74 import org.jaxen.XPath;
75 import org.jaxen.dom.DOMXPath;
76 import org.w3c.dom.Document;
77
78 /***
79 * @author Elliotte Rusty Harold
80 *
81 */
82 public class NumberTest extends TestCase {
83
84 private Document doc;
85
86 public void setUp() throws ParserConfigurationException
87 {
88 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
89 factory.setNamespaceAware(true);
90 DocumentBuilder builder = factory.newDocumentBuilder();
91 doc = builder.newDocument();
92 }
93
94
95 public NumberTest(String name) {
96 super(name);
97 }
98
99
100 public void testNumberFunctionOperatesOnFirstNodeInDocumentOrder()
101 throws JaxenException {
102
103 XPath xpath = new DOMXPath("number(//x)");
104 org.w3c.dom.Element a = doc.createElementNS("", "a");
105 org.w3c.dom.Element b = doc.createElementNS("", "b");
106 doc.appendChild(a);
107 a.appendChild(b);
108 org.w3c.dom.Element x2 = doc.createElementNS("", "x");
109 org.w3c.dom.Element x3 = doc.createElementNS("", "x");
110 org.w3c.dom.Element x4 = doc.createElementNS("", "x");
111 a.appendChild(x4);
112 b.appendChild(x2);
113 b.appendChild(x3);
114 x2.appendChild(doc.createTextNode("2"));
115 x3.appendChild(doc.createTextNode("3"));
116 x4.appendChild(doc.createTextNode("4"));
117
118 List result = xpath.selectNodes(doc);
119 assertEquals(1, result.size());
120 assertEquals(Double.valueOf("2.0"), result.get(0));
121
122 }
123
124 public void testNumberFunctionOperatesOnContextNode()
125 throws JaxenException {
126
127 XPath xpath = new DOMXPath("number()");
128 org.w3c.dom.Element a = doc.createElementNS("", "a");
129 doc.appendChild(a);
130 a.appendChild(doc.createTextNode("2"));
131
132 Double result = (Double) xpath.evaluate(doc);
133 assertEquals(2, result.intValue());
134
135 }
136
137
138 public void testNumberFunctionRequiresAtMostOneArgument()
139 throws JaxenException {
140
141 XPath xpath = new DOMXPath("number('2.2', '1.2')");
142
143 try {
144 xpath.selectNodes(doc);
145 fail("Allowed number function with two arguments");
146 }
147 catch (FunctionCallException ex) {
148 assertNotNull(ex.getMessage());
149 }
150
151 }
152
153
154 public void testNumberFunctionAppliedToNonNumericString()
155 throws JaxenException {
156
157 XPath xpath = new DOMXPath("number('Marx')");
158
159 Double result = (Double) xpath.evaluate(doc);
160 assertEquals(new Double(Double.NaN), result);
161
162 }
163
164 public void testIsNan() {
165 assertTrue(NumberFunction.isNaN(0.0 / 0.0));
166 }
167
168 }