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Java > Open Source Codes > org > apache > commons > jelly > tags > core > OtherwiseTag


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 }
45
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