1 /*
2 * Copyright 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.core;
17
18 import org.apache.commons.jelly.JellyTagException;
19 import org.apache.commons.jelly.TagSupport;
20 import org.apache.commons.jelly.XMLOutput;
21
22 /*** The otherwise block of a choose/when/otherwise group of tags
23 *
24 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
25 * @version $Revision: 155420 $
26 */
27 public class OtherwiseTag extends TagSupport {
28
29 public OtherwiseTag() {
30 }
31
32 // Tag interface
33 //-------------------------------------------------------------------------
34 public void doTag(XMLOutput output) throws JellyTagException {
35 ChooseTag tag = (ChooseTag) findAncestorWithClass( ChooseTag.class );
36 if ( tag == null ) {
37 throw new JellyTagException( "This tag must be enclosed inside a <choose> tag" );
38 }
39 if ( ! tag.isBlockEvaluated() ) {
40 tag.setBlockEvaluated(true);
41 invokeBody(output);
42 }
43 }
44 }