/*
* $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/InvokeBodyTag.java,v 1.11 2002/08/09 18:01:01 jstrachan Exp $
* $Revision: 1.11 $
* $Date: 2002/08/09 18:01:01 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: InvokeBodyTag.java,v 1.11 2002/08/09 18:01:01 jstrachan Exp $
*/
package org.apache.commons.jelly.tags.define;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.JellyException;
import org.apache.commons.jelly.Script;
import org.apache.commons.jelly.Tag;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.impl.DynamicTag;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* <invokeBody> tag is used inside a <tag> tag
* (i.e. the definition of a dynamic tag) to invoke the tags body when
* the tag is invoked.
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.11 $
*/
public class InvokeBodyTag extends TagSupport {
/** The Log to which logging calls will be made. */
private static final Log log = LogFactory.getLog(InvokeBodyTag.class);
public InvokeBodyTag() {
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws Exception {
// Try find find the body from the reserved 'org.apache.commons.jelly.body' variable
Script script = (Script) context.getVariable("org.apache.commons.jelly.body");
if (script != null) {
script.run(context, output);
}
else {
// note this mechanism does not work properly for arbitrarily
// nested dynamic tags. A better way is required.
Tag tag = findAncestorWithClass(this, DynamicTag.class);
if (tag == null) {
throw new JellyException("Cannot invoke body, no dynamic tag is defined in this block");
}
else {
tag.invokeBody(output);
}
}
}
}