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Java > Open Source Codes > org > apache > commons > jelly > tags > junit > AssertTag


1 /*
2  * Copyright 2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.jelly.tags.junit;
17
18 import org.apache.commons.jelly.JellyTagException;
19 import org.apache.commons.jelly.XMLOutput;
20 import org.apache.commons.jelly.MissingAttributeException;
21 import org.apache.commons.jelly.expression.Expression;
22
23 import org.jaxen.JaxenException;
24 import org.jaxen.XPath;
25
26 /**
27  * Performs an assertion that a given boolean expression, or XPath expression is
28  * true. If the expression returns false then this test fails.
29  *
30  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
31  * @version $Revision: 155420 $
32  */
33 public class AssertTag extends AssertTagSupport {
34
35     /** The expression to evaluate. */
36     private Expression test;
37
38     /** The XPath expression to evaluate */
39     private XPath xpath;
40
41     public AssertTag() {
42     }
43
44     // Tag interface
45 //-------------------------------------------------------------------------
46 public void doTag(XMLOutput output) throws JellyTagException {
47         if (test == null && xpath == null) {
48             throw new MissingAttributeException( "test" );
49         }
50         if (test != null) {
51             if (! test.evaluateAsBoolean(context)) {
52                 fail( getBodyText(), "evaluating test: "+ test.getExpressionText() );
53             }
54         }
55         else {
56             try {
57                 Object JavaDoc xpathContext = getXPathContext();
58                 if (! xpath.booleanValueOf(xpathContext)) {
59                     fail( getBodyText(), "evaluating xpath: "+ xpath );
60                 }
61             } catch (JaxenException anException) {
62                 throw new JellyTagException("Error evaluating xpath", anException);
63             }
64
65         }
66
67     }
68
69     // Properties
70 //-------------------------------------------------------------------------
71
72     /**
73      * Sets the boolean expression to evaluate. If this expression returns true
74      * then the test succeeds otherwise if it returns false then the text will
75      * fail with the content of the tag being the error message.
76      */
77     public void setTest(Expression test) {
78         this.test = test;
79     }
80
81     /**
82      * Sets the boolean XPath expression to evaluate. If this expression returns true
83      * then the test succeeds otherwise if it returns false then the text will
84      * fail with the content of the tag being the error message.
85      */
86     public void setXpath(XPath xpath) {
87         this.xpath = xpath;
88     }
89 }
90
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