View Javadoc

1   /*
2    * Copyright 1999-2002,2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.jelly.tags.define;
17  
18  import org.apache.commons.jelly.JellyTagException;
19  import org.apache.commons.jelly.TagSupport;
20  import org.apache.commons.jelly.XMLOutput;
21  
22  /***
23   * <super> tag is used to invoke a parent tag implementation, when
24   * a tag extends an existing tag
25   *
26   * @author <a href="mailto:tima@intalio.com">Tim Anderson</a>
27   * @version $Revision: 155420 $
28   * @see ExtendTag
29   */
30  public class SuperTag extends TagSupport {
31  
32      public SuperTag() {
33      }
34  
35      // Tag interface
36      //-------------------------------------------------------------------------
37      public void doTag(XMLOutput output) throws JellyTagException {
38          ExtendTag tag = (ExtendTag) findAncestorWithClass(ExtendTag.class);
39          if (tag == null) {
40              throw new JellyTagException(
41                  "<define:super> must be inside a <define:extend>");
42          }
43  
44          tag.getSuperScript().run(getContext(), output);
45      }
46  }
47