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Java > Open Source Codes > org > apache > struts > taglib > tiles > AddTag


1 /*
2  * $Id: AddTag.java 54929 2004-10-16 16:38:42Z germuska $
3  *
4  * Copyright 1999-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19
20 package org.apache.struts.taglib.tiles;
21
22 import javax.servlet.jsp.JspException JavaDoc;
23
24   /**
25    * Add an element to the surrounding list tag.
26    * Same syntax as <code>&lt;put&gt;</code>.
27    */
28 public class AddTag extends PutTag {
29
30   /**
31    * default constructor
32    */
33   public AddTag() {
34     super();
35   }
36
37     /**
38      * Call parent tag which must implement AttributeContainer.
39      * @throws JspException If we can't find an appropriate enclosing tag.
40      */
41   protected void callParent() throws JspException JavaDoc
42     {
43             // Get enclosing parent
44 AddTagParent enclosingParent = findEnclosingPutListTagParent();
45     enclosingParent.processNestedTag( this );
46     }
47
48     /**
49      * Find parent tag which must implement AttributeContainer.
50      * @throws JspException If we can't find an appropriate enclosing tag.
51      */
52   protected AddTagParent findEnclosingPutListTagParent() throws JspException JavaDoc {
53     try
54       {
55       AddTagParent parent = (AddTagParent)findAncestorWithClass(this,AddTagParent.class);
56       if( parent == null )
57         {
58         throw new JspException JavaDoc( "Error - tag add : enclosing tag doesn't accept 'add' tag." );
59         }
60       return parent;
61       }
62      catch( ClassCastException JavaDoc ex )
63       {
64       throw new JspException JavaDoc( "Error - tag add : enclosing tag doesn't accept 'add' tag." );
65       }
66   }
67 }
68
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