jcoverage | summary | package | file

Coverage details for org.chwf.taglib.jutil.IfTag

LineHitsSource
1 /*
2 Chrysalis Web Framework [http://chrysalis.sourceforge.net]
3 Copyright (c) 2002, 2003, 2004, Paul Strack
4  
5 All rights reserved.
6  
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9  
10 1. Redistributions of source code must retain the above copyright notice, this
11 list of conditions and the following disclaimer.
12  
13 2. Redistributions in binary form must reproduce the above copyright notice,
14 this list of conditions and the following disclaimer in the documentation
15 and/or other materials provided with the distribution.
16  
17 3. Neither the name of the copyright holder nor the names of its contributors
18 may be used to endorse or promote products derived from this software without
19 specific prior written permission.
20  
21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
22 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
25 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
28 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32  
33 package org.chwf.taglib.jutil;
34  
35 import javax.servlet.jsp.JspException;
36  
37 import org.chwf.servlet.ServletUtils;
38 import org.chwf.taglib.base.ObjectTagSupport;
39 import org.chwf.taglib.base.TagException;
40  
41 /**
42  * Tag handler for the <code>&lt;if&gt;</code> tag.
43  *
44  * @author <a href="mailto:pfstrack@users.sourceforge.net">Paul Strack</a>
45  */
4686public class IfTag extends ObjectTagSupport {
47  
48   /** Constant storing the last test result. */
491  public static final String LAST_IF_RESULT =
50     IfTag.class.getName() + ":LAST_IF_RESULT";
51  
52   /** Whether the test value is initialized. */
5342  private boolean initialized = false;
54  
55   /** The test value. */
5642  private boolean testResult = false;
57  
58   /**
59    * Calls superclass method. Is present here because of a bug in some servlet
60    * engines that requires tag attibute setters to be defined in the tag class
61    * itself.
62    *
63    * @param objectName The object name.
64    * @throws JspException For errors.
65    */
66   public void setObject(String objectName) throws JspException {
6739    super.setObject(objectName);
6839  }
69  
70   /**
71    * Calls superclass method. Is present here because of a bug in some servlet
72    * engines that requires tag attibute setters to be defined in the tag class
73    * itself.
74    *
75    * @param property The property name.
76    * @throws JspException For errors.
77    */
78   public void setProperty(String property) throws JspException {
7939    super.setProperty(property);
8039  }
81  
82   /**
83    * Calls superclass method. Is present here because of a bug in some servlet
84    * engines that requires tag attibute setters to be defined in the tag class
85    * itself.
86    *
87    * @param el The JSTL Expression Language statement.
88    */
89   public void setEl(String el) {
905    super.setEl(el);
915  }
92  
93   /**
94    * Clean up data for tag handler reuse and pooling. Should be overridden in
95    * tag handler. Subclasses should always invoke their superclass's cleanup
96    * method: <code>super.cleanup()</code>
97    */
98   public void cleanup() {
9910    super.cleanup();
10010    this.initialized = false;
10110    this.testResult = false;
10210  }
103  
104   /**
105    * Evaluates test property and conditionally executes body.
106    *
107    * @return EVAL_BODY_INCLUDE If the test is true
108    * @throws JspException If an exception is thrown during testing.
109    */
110   public int doStart() throws JspException {
111     try {
11216      this.initialized = false;
11316      if (getTestResult()) {
1148        return EVAL_BODY_INCLUDE;
115       }
1168    } catch (Exception ex) {
1170      throw new TagException(ex);
118     }
1198    return SKIP_BODY;
120   }
121  
122   /**
123    * Initialize LAST_IF_RESULT.
124    *
125    * @return EVAL_PAGE
126    * @throws JspException For expression language parse errors.
127    */
128   public int doEnd() throws JspException {
1297    ServletUtils.setPageAttribute(
130       pageContext,
131       LAST_IF_RESULT,
132       new Boolean(getTestResult()));
1337    return EVAL_PAGE;
134   }
135  
136   /**
137    * Get results of test.
138    *
139    * @return true if object property evaluates to true.
140    * @throws JspException For expression language parse errors.
141    */
142   public boolean getTestResult() throws JspException {
14326    if (!this.initialized) {
14418      this.testResult = false;
14518      Object value = super.getTagResult(Boolean.class);
14618      if (value instanceof Boolean) {
14718        this.testResult = ((Boolean) value).booleanValue();
148       }
14918      this.initialized = true;
150     }
15126    return this.testResult;
152   }
153 }

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