/*
 * 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.
 */
// Class header file.
#include "XResultTreeFrag.hpp"


#include <xalanc/XalanDOM/XalanDocumentFragment.hpp>
#include <xalanc/XalanDOM/XalanNodeList.hpp>
#include <xalanc/XalanDOM/XalanText.hpp>


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


#include <xalanc/DOMSupport/DOMServices.hpp>


#include <xalanc/XPath/FormatterStringLengthCounter.hpp>
#include <xalanc/XPath/NodeRefListBase.hpp>
#include <xalanc/XPath/XObjectTypeCallback.hpp>


#include <xalanc/XSLT/StylesheetExecutionContext.hpp>


XALAN_CPP_NAMESPACE_BEGIN


inline const XalanDOMString*
getSingleTextChildValue(const XalanDocumentFragment&	theRTreeFrag)
{
	const XalanNode* const	theFirstChild = theRTreeFrag.getFirstChild();

	if (theFirstChild != 0 &&
		theFirstChild->getNodeType() == XalanNode::TEXT_NODE &&
		theFirstChild->getNextSibling() == 0)
	{
		return &theFirstChild->getNodeValue();
	}
	else
	{
		return 0;
	}
}


XResultTreeFrag::XResultTreeFrag(XalanDocumentFragment&		value) :
	XObject(eTypeResultTreeFrag),
	m_value(&value),
	m_singleTextChildValue(getSingleTextChildValue(value)),
	m_executionContext(0),
	m_cachedStringValue(),
	m_cachedNumberValue(0.0)
{
}


XResultTreeFrag::XResultTreeFrag(
			const XResultTreeFrag&	source,
			bool					/* deepClone */) :
	XObject(source),
	m_value(source.m_value),
	m_singleTextChildValue(source.m_singleTextChildValue),
	m_executionContext(0),
	m_cachedStringValue(source.m_cachedStringValue),
	m_cachedNumberValue(source.m_cachedNumberValue)
{
	assert(m_value != 0);
}


XResultTreeFrag::~XResultTreeFrag()
{
}


#if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
XObject*
#else
XResultTreeFrag*
#endif
XResultTreeFrag::clone(void*	theAddress) const
{
	if (theAddress == 0)
	{
		return new XResultTreeFrag(*this);
	}
	else
	{
		return new (theAddress) XResultTreeFrag(*this);
	}
}


XalanDOMString
XResultTreeFrag::getTypeString() const
{
	return StaticStringToDOMString(XALAN_STATIC_UCODE_STRING("#RESULT_TREE_FRAG"));
}


double
XResultTreeFrag::num() const
{
	if (m_cachedNumberValue == 0.0)
	{
#if defined(XALAN_NO_MUTABLE)
		((XResultTreeFrag*)this)->m_cachedNumberValue = DoubleSupport::toDouble(str());
#else
		m_cachedNumberValue = DoubleSupport::toDouble(str());
#endif
	}

	return m_cachedNumberValue;
}


bool
XResultTreeFrag::boolean() const
{
	// Result tree fragments always evaluate to true.
	return true;
}


const XalanDOMString&
XResultTreeFrag::str() const
{
	if (m_singleTextChildValue != 0)
	{
		assert(m_value->getFirstChild() != 0 &&
				m_value->getFirstChild()->getNodeType() == XalanNode::TEXT_NODE);

		return *m_singleTextChildValue;
	}
	else if (isEmpty(m_cachedStringValue) == true)
	{
#if defined(XALAN_NO_MUTABLE)
		DOMServices::getNodeData(*m_value, ((XResultTreeFrag*)this)->m_cachedStringValue);
#else
		DOMServices::getNodeData(*m_value, m_cachedStringValue);
#endif
	}

	return m_cachedStringValue;
}


void
XResultTreeFrag::str(
			FormatterListener&	formatterListener,
			MemberFunctionPtr	function) const
{
	if (m_singleTextChildValue != 0)
	{
		assert(m_value->getFirstChild() != 0 &&
				m_value->getFirstChild()->getNodeType() == XalanNode::TEXT_NODE);

		assert(length(*m_singleTextChildValue) == FormatterListener::size_type(length(*m_singleTextChildValue)));

		(formatterListener.*function)(c_wstr(*m_singleTextChildValue), FormatterListener::size_type(length(*m_singleTextChildValue)));
	}
	else if (isEmpty(m_cachedStringValue) == false)
	{
		assert(length(m_cachedStringValue) == FormatterListener::size_type(length(m_cachedStringValue)));

		(formatterListener.*function)(c_wstr(m_cachedStringValue), FormatterListener::size_type(length(m_cachedStringValue)));
	}
	else
	{
		DOMServices::getNodeData(*m_value, formatterListener, function);
	}
}


void
XResultTreeFrag::str(XalanDOMString&	theBuffer) const
{
	if (m_singleTextChildValue != 0)
	{
		append(theBuffer, *m_singleTextChildValue);
	}
	else if (isEmpty(m_cachedStringValue) == false)
	{
		append(theBuffer, m_cachedStringValue);
	}
	else
	{
		DOMServices::getNodeData(*m_value, theBuffer);
	}
}


double
XResultTreeFrag::stringLength() const
{
	if (m_singleTextChildValue != 0)
	{
		return m_singleTextChildValue->length();
	}
	else if (isEmpty(m_cachedStringValue) == false)
	{
		return length(m_cachedStringValue);
	}
	else
	{
		FormatterStringLengthCounter	theCounter;

		DOMServices::getNodeData(*m_value, theCounter, &FormatterListener::characters);

		return theCounter.getCount();
	}
}


const XalanDocumentFragment&
XResultTreeFrag::rtree() const
{
	assert(m_value != 0);

	return *m_value;
}


const NodeRefListBase&
XResultTreeFrag::nodeset() const
{
	return ParentType::nodeset();
}


void
XResultTreeFrag::ProcessXObjectTypeCallback(XObjectTypeCallback&	theCallbackObject)
{
	theCallbackObject.ResultTreeFragment(*this,
										 rtree());
}


void
XResultTreeFrag::ProcessXObjectTypeCallback(XObjectTypeCallback&	theCallbackObject) const
{
	theCallbackObject.ResultTreeFragment(*this,
										 rtree());
}


XalanDocumentFragment*
XResultTreeFrag::release()
{
	m_singleTextChildValue = 0;

	clear(m_cachedStringValue);

	m_cachedNumberValue = 0.0;

	XalanDocumentFragment* const	temp = m_value;

	m_value = 0;

	return temp;
}


void
XResultTreeFrag::set(XalanDocumentFragment&		theValue)
{
	release();

	m_value = &theValue;

	m_singleTextChildValue = getSingleTextChildValue(*m_value);
}


void
XResultTreeFrag::dereferenced()
{
	if (m_executionContext == 0 ||
		// We're dead after we call this, if it returns true;
		m_executionContext->returnXResultTreeFrag(this) == false)
	{
		delete m_value;

		delete this;
	}
}


XALAN_CPP_NAMESPACE_END