/*
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 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.
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* 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.
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* Foundation" must not be used to endorse or promote products derived
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
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*/
package org.apache.commons.jelly.tags.jsl;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.tags.xml.XPathTagSupport;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.rule.Stylesheet;
import org.jaxen.XPath;
/**
* This tag performs a JSL stylesheet which was previously
* created via an <stylesheet> tag.
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.8 $
*/
public class StyleTag extends XPathTagSupport {
/** The Log to which logging calls will be made. */
private Log log = LogFactory.getLog(StyleTag.class);
/** Holds the stylesheet which will be applied to the source context. */
private Stylesheet stylesheet;
/** The XPath expression to evaluate. */
private XPath select;
public StyleTag() {
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws Exception {
Stylesheet stylesheet = getStylesheet();
if (stylesheet == null) {
throw new MissingAttributeException("stylesheet");
}
Object source = getSource();
if (log.isDebugEnabled()) {
log.debug("About to evaluate stylesheet on source: " + source);
}
stylesheet.run(source);
}
// Properties
//-------------------------------------------------------------------------
public Stylesheet getStylesheet() {
return stylesheet;
}
/**
* Sets the stylesheet to use to style this tags body
*/
public void setStylesheet(Stylesheet stylesheet) {
this.stylesheet = stylesheet;
}
/** Sets the XPath expression to evaluate. */
public void setSelect(XPath select) {
this.select = select;
}
// Implementation methods
//-------------------------------------------------------------------------
/** @return the source on which the stylesheet should run
*/
protected Object getSource() throws Exception {
Object source = getXPathContext();
if ( select != null ) {
return select.evaluate(source);
}
return source;
}
}