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23 package org.apache.struts.tiles.taglib;
24
25 import javax.servlet.jsp.JspException;
26
27 /**
28 * Add an element to the surrounding list tag.
29 * Same syntax as <code><put></code>.
30 */
31 public class AddTag extends PutTag {
32
33 /**
34 * default constructor
35 */
36 public AddTag() {
37 super();
38 }
39
40 /**
41 * Call parent tag which must implement AttributeContainer.
42 * @throws JspException If we can't find an appropriate enclosing tag.
43 */
44 protected void callParent() throws JspException
45 {
46
47 AddTagParent enclosingParent = findEnclosingPutListTagParent();
48 enclosingParent.processNestedTag( this );
49 }
50
51 /**
52 * Find parent tag which must implement AttributeContainer.
53 * @throws JspException If we can't find an appropriate enclosing tag.
54 */
55 protected AddTagParent findEnclosingPutListTagParent() throws JspException {
56 try
57 {
58 AddTagParent parent = (AddTagParent)findAncestorWithClass(this,AddTagParent.class);
59 if( parent == null )
60 {
61 throw new JspException( "Error - tag add : enclosing tag doesn't accept 'add' tag." );
62 }
63 return parent;
64 }
65 catch( ClassCastException ex )
66 {
67 throw new JspException( "Error - tag add : enclosing tag doesn't accept 'add' tag." , ex);
68 }
69 }
70 }