/*
 * 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 "ElemApplyTemplates.hpp"


#include <sax/AttributeList.hpp>


#include "Constants.hpp"
#include "Stylesheet.hpp"
#include "StylesheetRoot.hpp"
#include "StylesheetConstructionContext.hpp"
#include "StylesheetExecutionContext.hpp"
#include "TracerEvent.hpp"


ElemApplyTemplates::ElemApplyTemplates(
			StylesheetConstructionContext&	constructionContext,
			Stylesheet&						stylesheetTree,
			const AttributeList&			atts,
			int								lineNumber,
			int								columnNumber) :
	ElemForEach(constructionContext,
				stylesheetTree,
				lineNumber,
				columnNumber,
				Constants::ELEMNAME_APPLY_TEMPLATES),
	m_isDefaultTemplate(false),
	m_mode()
{
	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_SELECT:
			m_selectPattern = constructionContext.createXPath(getLocator(), atts.getValue(i), *this);
			break;

		case Constants::TATTRNAME_MODE:
			m_mode = XalanQNameByValue(atts.getValue(i), getStylesheet().getNamespaces());
			break;

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

	if(0 == m_selectPattern)
	{
		m_selectPattern = constructionContext.createXPath(
			getLocator(),
			Constants::PSEUDONAME_NODE,
			*this);
	}

	assert(m_selectPattern != 0);
}


ElemApplyTemplates::~ElemApplyTemplates()
{
}


const XalanDOMString&
ElemApplyTemplates::getElementName() const
{
	return Constants::ELEMNAME_APPLY_TEMPLATES_WITH_PREFIX_STRING;
}


void
ElemApplyTemplates::execute(StylesheetExecutionContext&		executionContext) const
{
	assert(m_selectPattern != 0);

	if(0 != executionContext.getTraceListeners())
	{
		executionContext.fireTraceEvent(TracerEvent(
		  executionContext, *this));
	}

	XalanNode* const	sourceNode = executionContext.getCurrentNode();

	if (0 != sourceNode)
	{
		// Dragons here.  Push the params & stack frame, but then execute the
		// select statement inside transformSelectedChildren, which must be
		// executed in the stack frame before the new stack frame.  Because of
		// depth-first searching, this gets worse.
		StylesheetExecutionContext::ParamsPushPop	thePushPop(
			executionContext,
			*this,
			sourceNode,
			this);

		assert(executionContext.getCurrentMode() != 0);

		const XalanQName* const		currentMode = executionContext.getCurrentMode();

		if (m_isDefaultTemplate == false &&
			!m_mode.equals(*currentMode))
		{
			executionContext.setCurrentMode(&m_mode);

			transformSelectedChildren(
				executionContext,
				0,
				sourceNode,
				thePushPop.getStackFrameIndex());

			executionContext.setCurrentMode(currentMode);
		}
		else
		{
			transformSelectedChildren(
				executionContext,
				0,
				sourceNode,
				thePushPop.getStackFrameIndex());
		}
	}
    else
	{
		executionContext.error(
			"There is no current node in ElemApplyTemplates::execute()",
			sourceNode,
			this);
	}
}


bool
ElemApplyTemplates::childTypeAllowed(int	xslToken) const
{
	bool	fResult = false;

	switch(xslToken)
	{
	// char-instructions 
	case Constants::ELEMNAME_SORT:
	case Constants::ELEMNAME_WITHPARAM:
		fResult = true;
		break;

	default:
		break;
	}

	return fResult;
}