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 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  }