SubmitTag


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 org.apache.log4j.Logger;
15  
16  import com.inversoft.verge.mvc.view.HtmlViewToolkit;
17  
18  
19  /**
20   * This class generates a simple submit tag. This tag must
21   * be embedded in a form tag (custom form tag in this
22   * package).
23   *
24   * @author  Brian Pontarelli
25   */
26  public class SubmitTag extends BaseControllerTag {
27  
28      /**
29       * This classes logger
30       */
31      private static final Logger logger = Logger.getLogger(SubmitTag.class);
32  
33  
34      /**
35       * Creates an HTML submit tag. This is constructed using the value attribute
36       * and the bean attribute. The bean attribute uses dot notation to signify
37       * what bean to use and what method to call. The bean to use is a simple name
38       * setup using an include tag. The method to call is the JavaBean name for
39       * the handler method. ie foo corresponds to handleFoo.
40       *
41       * @return  Always returns SKIP_BODY
42       * @throws  JspException If this tag is not in a form tag, the bean was not
43       *          included or the bean attribute doesn't specify a handler name
44       */
45      public int doStartTag() throws JspException   {
46  
47          // Initialize this reference
48          initialize();
49  
50          StringBuffer   buf = new StringBuffer  ();
51          createSubmitTag(buf, getId(), localName, localValue);
52  
53          if (logger.isDebugEnabled()) {
54              logger.debug("The submit tag: " + buf.toString());
55          }
56  
57          try {
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 submit tag with the name, value, attributes (single and named)
70       *
71       * @param   buf The StringBuffer to append to
72       * @param   id The id of the tag
73       * @param   name The name of the tag
74       * @param   value The value of the tag
75       */
76      protected void createSubmitTag(StringBuffer   buf, String   id, String   name,
77              Object   value) {
78          String   valueStr = (value == null) ? null : value.toString();
79          HtmlViewToolkit.createSubmitTag(buf, id, name, valueStr,
80              attributes, singleAttrs);
81      }
82  }
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