/*
 * 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. 
 *
 * 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 acknowledgment:  
 *		 "This product includes software developed by the
 *		  Apache Software Foundation (http://www.apache.org/)."
 *	  Alternately, this acknowledgment may appear in the software itself,
 *	  if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" 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",
 *	  nor may "Apache" appear in their name, without prior written
 *	  permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.	IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * 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 and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
#include "ElemFallback.hpp"


#include <cassert>


#include <PlatformSupport/DOMStringHelper.hpp>


#include "Constants.hpp"
#include "ElemExtensionCall.hpp"
#include "StylesheetConstructionContext.hpp"
#include "StylesheetExecutionContext.hpp"


ElemFallback::ElemFallback(
			StylesheetConstructionContext&	constructionContext,
			Stylesheet& 					stylesheetTree,
			const AttributeList&			atts,
			int 							lineNumber,
			int 							columnNumber) :
	ElemTemplateElement(constructionContext,
						stylesheetTree,
						lineNumber,
						columnNumber,
						Constants::ELEMNAME_FALLBACK)
{
	const unsigned int	nAttrs = atts.getLength();

	for(unsigned int i = 0; i < nAttrs; i++)
	{
		const XalanDOMChar* const	aname = atts.getName(i);

		const int					tok =
			constructionContext.getAttrTok(aname);

		switch(tok)
		{
		case Constants::TATTRNAME_XMLSPACE:
			processSpaceAttr(atts, i);
			break;

		default:
			if(!isAttrOK(aname, atts, i, constructionContext))
			{
				constructionContext.error(
					"xsl:fallback has an illegal attribute",
					0,
					this);
			}
		}
	}
}


const XalanDOMString&
ElemFallback::getElementName() const
{
	return Constants::ELEMNAME_FALLBACK_WITH_PREFIX_STRING;
}


ElemFallback::~ElemFallback()
{
}


void
ElemFallback::execute(StylesheetExecutionContext&		executionContext) const
{
	const ElemTemplateElement* const	parent =
			getParentNodeElem();
	assert(parent != 0);

	if(parent->getXSLToken() == Constants::ELEMNAME_EXTENSIONCALL)
	{
		const ElemExtensionCall* const	extensionParent =
#if defined(XALAN_OLD_STYLE_CASTS)
			(const ElemExtensionCall*)parent;
#else
			static_cast<const ElemExtensionCall*>(parent); 
#endif

		if(extensionParent->elementAvailable(executionContext) == false)
		{
			ElemTemplateElement::execute(executionContext);

			executeChildren(executionContext);
		}
	}
	else
	{
		// Should never happen
		executionContext.error(
			"Parent of xsl:fallback must be an extension element",
			executionContext.getCurrentNode(),
			this);
	}
}