CheckboxTag


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.html;
8   
9   
10  import java.io.IOException  ;
11  
12  import javax.servlet.jsp.JspException  ;
13  
14  import com.inversoft.verge.mvc.view.HtmlViewToolkit;
15  
16  
17  /**
18   * This class is the check box input tag.
19   *
20   * @author  Brian Pontarelli
21   */
22  public class CheckboxTag extends InputTag {
23  
24      private Boolean   checked;
25  
26  
27      /**
28       * Retrieves the tag's checked attribute
29       *
30       * @return  The tag's checked attribute
31       */
32      public Boolean   getChecked() {
33          return checked;
34      }
35  
36      /**
37       * Populates the tag's checked attribute
38       *
39       * @param   checked The tag's checked attribute
40       */
41      public void setChecked(Boolean   checked) {
42          this.checked = checked;
43      }
44  
45      /**
46       * Generate the HTML tag
47       *
48       * @see javax.servlet.jsp.tagext.Tag#doStartTag()
49       */
50      public int doStartTag() throws JspException   {
51  
52          // Initialize the parent
53          initialize();
54  
55          try {
56              StringBuffer   buf = new StringBuffer  ();
57              createCheckboxTag(buf, getId(), localName, localValue, checked);
58              pageContext.getOut().print(buf.toString());
59          } catch (IOException   ioe) {
60              throw new JspException  (ioe.toString());
61          }
62  
63          return SKIP_BODY;
64      }
65  
66      /**
67       * Does the work of creating the tags body. This method can be overridden
68       * in sub-classes to change the attributes that are appended, etc. By default
69       * this creates a radio tag with the name, value, attributes (single and named)
70       * and NOT checked
71       *
72       * @param   checked Determines whether or not this tag is checked or not
73       * @param   buf The StringBuffer to append to
74       */
75      protected void createCheckboxTag(StringBuffer   buf, String   id, String   name,
76              Object   value, Boolean   checked)
77      throws JspException   {
78          boolean checkedBool = (checked == null) ? false : checked.booleanValue();
79          String   valueStr = (value == null) ? null : value.toString();
80          HtmlViewToolkit.createCheckboxTag(buf, id, name, valueStr, checkedBool,
81              attributes, singleAttrs);
82      }
83  }
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