/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "ElemValueOf.hpp"


#include <xercesc/sax/AttributeList.hpp>


#include <xalanc/PlatformSupport/DOMStringHelper.hpp>
#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>


#include <xalanc/DOMSupport/DOMServices.hpp>


#include <xalanc/XPath/XObjectFactory.hpp>
#include <xalanc/XPath/XPath.hpp>


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


XALAN_CPP_NAMESPACE_BEGIN


ElemValueOf::ElemValueOf(
			StylesheetConstructionContext&	constructionContext,
			Stylesheet&						stylesheetTree,
			const AttributeListType&		atts,
			int								lineNumber,
			int								columnNumber) :
	ElemTemplateElement(constructionContext,
						stylesheetTree,
						lineNumber,
						columnNumber,
						StylesheetConstructionContext::ELEMNAME_VALUE_OF),
	m_selectPattern(0)
{
	bool	isSelectCurrentNode = false;

	const unsigned int	nAttrs = atts.getLength();

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

		if (equals(aname, Constants::ATTRNAME_SELECT))
		{
			const XalanDOMChar* const	avalue = atts.getValue(i);
			assert(avalue != 0);

			if (avalue[0] == XalanUnicode::charFullStop && avalue[1] == 0)
			{
				isSelectCurrentNode = true;
			}
			else
			{
				m_selectPattern =
						constructionContext.createXPath(
							getLocator(),
							avalue,
							*this);
			}
		}
		else if (equals(aname, Constants::ATTRNAME_DISABLE_OUTPUT_ESCAPING))
		{
			disableOutputEscaping(
				getStylesheet().getYesOrNo(
					aname,
					atts.getValue(i),
					constructionContext));
		}
		else if(!(isAttrOK(aname, atts, i, constructionContext) || 
				 processSpaceAttr(aname, atts, i, constructionContext)))
		{
			constructionContext.error(
					XalanMessageLoader::getMessage(
						XalanMessages::TemplateHasIllegalAttribute_2Param,
							Constants::ELEMNAME_VALUEOF_WITH_PREFIX_STRING.c_str(),
							aname),
					0,
					this);
		}
	}

	if(isSelectCurrentNode == false && m_selectPattern == 0)
	{
		constructionContext.error(
			XalanMessageLoader::getMessage(
				XalanMessages::ElementRequiresAttribute_2Param,
				Constants::ELEMNAME_VALUEOF_WITH_PREFIX_STRING,
				Constants::ATTRNAME_SELECT),
			0,
			this);
	}
}


ElemValueOf::~ElemValueOf()
{
}


const XalanDOMString&
ElemValueOf::getElementName() const
{
	return Constants::ELEMNAME_VALUEOF_WITH_PREFIX_STRING;
}


class FormatterListenerAdapater : public FormatterListener
{
public:

	FormatterListenerAdapater(StylesheetExecutionContext&	executionContext) :
		FormatterListener(OUTPUT_METHOD_NONE),
		m_executionContext(executionContext)
	{
	}

	~FormatterListenerAdapater()
	{
	}

	void
	setDocumentLocator(const LocatorType* const	/* locator */)
	{
	}

	void
	startDocument()
	{
	}

	void
	endDocument()
	{
	}

	void
	startElement(
				const	XMLCh* const	/* name */,
				AttributeListType&		/* attrs */)
	{
	}

	void
	endElement(const	XMLCh* const	/* name */)
	{
	}

	void
	characters(
				const XMLCh* const	chars,
				const unsigned int	length)
	{
		m_executionContext.characters(chars, 0, length);
	}

	void
	charactersRaw(
			const XMLCh* const	chars,
			const unsigned int	length)
	{
		m_executionContext.charactersRaw(chars, 0, length);
	}

	void
	entityReference(const XMLCh* const	/* name */)
	{
	}

	void
	ignorableWhitespace(
				const XMLCh* const	/* chars */,
				const unsigned int	/* length */)
	{
	}

	void
	processingInstruction(
				const XMLCh* const	target,
				const XMLCh* const	data)
	{
		m_executionContext.processingInstruction(target, data);
	}

	void
	resetDocument()
	{
	}

	void
	comment(const XMLCh* const	data)
	{
		m_executionContext.comment(data);
	}

	void
	cdata(
				const XMLCh* const	/* ch */,
				const unsigned int 	/* length */)
	{
	}

private:

	StylesheetExecutionContext&		m_executionContext;

};


#if !defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
const ElemTemplateElement*
ElemValueOf::startElement(StylesheetExecutionContext&		executionContext) const
{
	ElemTemplateElement::startElement(executionContext);

	XalanNode* const	sourceNode = executionContext.getCurrentNode();
	assert(sourceNode != 0);

	if (m_selectPattern == 0)
	{
		if (disableOutputEscaping() == false)
		{
			executionContext.characters(*sourceNode);
		}
		else
		{
			executionContext.charactersRaw(*sourceNode);
		}

		if(0 != executionContext.getTraceListeners())
		{
			const StylesheetExecutionContext::GetAndReleaseCachedString		theString(executionContext);

			DOMServices::getNodeData(*sourceNode, theString.get());

			fireSelectionEvent(executionContext, sourceNode, theString.get());
		}
	}
	else
	{
		FormatterListenerAdapater	theAdapter(executionContext);

		XPath::MemberFunctionPtr	theFunction = disableOutputEscaping() == false ?
			&FormatterListener::characters : &FormatterListener::charactersRaw;

		m_selectPattern->execute(*this, executionContext, theAdapter, theFunction);

		if(0 != executionContext.getTraceListeners())
		{
			const XObjectPtr	value(m_selectPattern->execute(sourceNode, *this, executionContext));

			if (value.null() == false)
			{
				fireSelectionEvent(executionContext, sourceNode, value);
			}
		}
	}

	return 0;
}
#endif


#if defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
void
ElemValueOf::execute(StylesheetExecutionContext&	executionContext) const
{
	ElemTemplateElement::execute(executionContext);

	XalanNode* const	sourceNode = executionContext.getCurrentNode();
	assert(sourceNode != 0);

	if (m_selectPattern == 0)
	{
		if (disableOutputEscaping() == false)
		{
			executionContext.characters(*sourceNode);
		}
		else
		{
			executionContext.charactersRaw(*sourceNode);
		}

		if(0 != executionContext.getTraceListeners())
		{
			const StylesheetExecutionContext::GetAndReleaseCachedString		theString(executionContext);

			DOMServices::getNodeData(*sourceNode, theString.get());

			fireSelectionEvent(executionContext, sourceNode, theString.get());
		}
	}
	else
	{
		FormatterListenerAdapater	theAdapter(executionContext);

		XPath::MemberFunctionPtr	theFunction = disableOutputEscaping() == false ?
			&FormatterListener::characters : &FormatterListener::charactersRaw;

		m_selectPattern->execute(*this, executionContext, theAdapter, theFunction);

		if(0 != executionContext.getTraceListeners())
		{
			const XObjectPtr	value(m_selectPattern->execute(sourceNode, *this, executionContext));

			if (value.null() == false)
			{
				fireSelectionEvent(executionContext, sourceNode, value);
			}
		}
	}
}
#endif


const XPath*
ElemValueOf::getXPath(unsigned int	index) const
{
	return index == 0 ? m_selectPattern : 0;
}


void
ElemValueOf::fireSelectionEvent(
			StylesheetExecutionContext&		executionContext,
			XalanNode*						sourceNode,
			const XalanDOMString&			theValue) const
{
	const XObjectPtr value(executionContext.getXObjectFactory().createStringReference(theValue));

	fireSelectionEvent(executionContext, sourceNode, value);
}


void
ElemValueOf::fireSelectionEvent(
			StylesheetExecutionContext&		executionContext,
			XalanNode*						sourceNode,
			const XObjectPtr				theValue) const
{
	if (m_selectPattern != 0)
	{
		fireSelectionEvent(
			executionContext,
			sourceNode,
			theValue,
			m_selectPattern->getExpression().getCurrentPattern());
	}
	else
	{
		const StylesheetExecutionContext::GetAndReleaseCachedString		thePattern(executionContext);

		thePattern.get() = XALAN_STATIC_UCODE_STRING(".");

		fireSelectionEvent(
			executionContext,
			sourceNode,
			theValue,
			thePattern.get());
	}

}


void
ElemValueOf::fireSelectionEvent(
			StylesheetExecutionContext&		executionContext,
			XalanNode*						sourceNode,
			const XObjectPtr				theValue,
			const XalanDOMString&			thePattern) const
{
	executionContext.fireSelectEvent(
		SelectionEvent(
			executionContext,
			sourceNode,
			*this,
			StaticStringToDOMString(XALAN_STATIC_UCODE_STRING("select")),
			thePattern,
			theValue));
}


XALAN_CPP_NAMESPACE_END