01: /*
02: * Copyright 2002,2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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(
38: "This tag must be enclosed inside a <choose> tag");
39: }
40: if (!tag.isBlockEvaluated()) {
41: tag.setBlockEvaluated(true);
42: invokeBody(output);
43: }
44: }
45: }
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