RadioTag


1   /*
2    * Copyright (c) 2003, Inversoft
3    *
4    * This software is distribuable under the GNU Lesser General Public License.
5    * For more information visit gnu.org.
6    */
7   package com.inversoft.verge.mvc.view.jsp.model;
8   
9   
10  import javax.servlet.jsp.JspException  ;
11  
12  import com.inversoft.util.ObjectTools;
13  import com.inversoft.verge.mvc.model.ModelResolution;
14  import com.inversoft.verge.mvc.view.jsp.JspTools;
15  
16  
17  /**
18   * This class is the radio box input tag.
19   *
20   * @author  Brian Pontarelli
21   */
22  public class RadioTag extends com.inversoft.verge.mvc.view.jsp.html.RadioTag {
23  
24      protected ModelResolution modelResolution;
25  
26  
27      /**
28       * Initializes the tag by checking that the tag is inside a form tag
29       *
30       * @throws  JspException If this tag is not inside a form tag
31       */
32      public void initialize() throws JspException   {
33  
34          // Initialize the parent reference and the bean reference
35          super.initialize();
36          super.initializeKeyProperty();
37  
38          // Check if there is another radio tag for the same model definition
39          // and if so use that tags name
40          String   tempName = null;
41          if (!hasName()) {
42              tempName = JspTools.getRadioName(localModel, pageContext);
43              if (tempName != null) {
44                  localName = tempName;
45              } else {
46                  // If the initializers setup a new name because it was null
47                  // before, add it to the PageContext
48                  JspTools.setRadioName(localModel, localName, pageContext);
49              }
50          }
51  
52          modelResolution = ModelHelper.getModelResolution(key, property, pageContext);
53          if (modelResolution == null) {
54              throw new JspException  ("Invalid model definition: " + getModel());
55          }
56      }
57  
58      /**
59       * Outputs the extra model information
60       *
61       * @return  Always returns EVAL_PAGE
62       */
63      public int doEndTag() throws JspException   {
64          super.doEndTag();
65  
66          if (isSetValue()) {
67              ModelHelper.outputModelExtra(modelResolution.getMetaData(), localName,
68                  pageContext);
69          }
70  
71          return EVAL_PAGE;
72      }
73  
74      /**
75       * Overrides the {@link com.inversoft.verge.mvc.view.jsp.html.RadioTag
76       * #createRadioTag(StringBuffer, String, String, Object, Boolean)
77       * super.createRadioTag()} method and determines if this radio tag instance
78       * if checked or not.
79       *
80       * @param   buf The StringBuffer to append the HTML to
81       * @param   checked The checked flag from the parent class
82       * @param   value The value of the radio instance
83       * @throws  JspException If there was any problems generating the HTML
84       */
85      protected void createRadioTag(StringBuffer   buf, String   id, String   name,
86          Object   value, Boolean   checked)
87      throws JspException   {
88          if (isGetValue()) {
89              Object   valueObj = ModelHelper.getValue(modelResolution, pageContext);
90              checked = ObjectTools.areObjectsEqual(valueObj, value) ?
91                  Boolean.TRUE : Boolean.FALSE;
92          }
93  
94          super.createRadioTag(buf, id, name, value, checked);
95      }
96  }
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