/*
 * 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 "ResultNamespacesStack.hpp"


XALAN_CPP_NAMESPACE_BEGIN


ResultNamespacesStack::ResultNamespacesStack() :
	m_resultNamespaces(1),
	m_stackBegin(m_resultNamespaces.begin()),
	m_stackPosition(m_stackBegin),
	m_createNewContextStack()
{
	// m_resultNamespaces is initialized to a size of
	// 1, so we always have a dummy entry at the
	// beginning.  This makes the implementation
	// much simpler.
}


ResultNamespacesStack::~ResultNamespacesStack()
{
}


void
ResultNamespacesStack::addDeclaration(
			const XalanDOMString&		thePrefix,
	        const XalanDOMChar*			theNamespaceURI,
			XalanDOMString::size_type	theLength)
{
	assert(theNamespaceURI != 0);
	assert(m_createNewContextStack.empty() == false);

	// Check to see if we need to create a new context and do so if necessary...
	if (m_createNewContextStack.back() == true)
	{
		++m_stackPosition;

		if (m_stackPosition == m_resultNamespaces.end())
		{
			m_resultNamespaces.resize(m_resultNamespaces.size() + 1);

			m_stackPosition = m_resultNamespaces.end() - 1;
			m_stackBegin = m_resultNamespaces.begin();
		}

		m_createNewContextStack.back() = false;
	}

	NamespaceVectorType&	theCurrentNamespaces = *m_stackPosition;

	// Add a new namespace at the end of the current namespaces.
	theCurrentNamespaces.resize(theCurrentNamespaces.size() + 1);

	NameSpace&	theNewNamespace = theCurrentNamespaces.back();

	theNewNamespace.setPrefix(thePrefix);

	theNewNamespace.setURI(theNamespaceURI, theLength);
}


void
ResultNamespacesStack::pushContext()
{
	if (m_createNewContextStack.empty() == true)
	{
		m_createNewContextStack.reserve(eDefaultCreateNewContextStackSize);
	}

	m_createNewContextStack.push_back(true);
}


void
ResultNamespacesStack::popContext()
{
	assert(m_createNewContextStack.empty() == false);

	if (m_createNewContextStack.back() == false)
	{
		assert(m_resultNamespaces.empty() == false &&
			   m_stackPosition != m_resultNamespaces.begin());

		(*m_stackPosition).clear();

		--m_stackPosition;
	}

	m_createNewContextStack.pop_back();
}


const XalanDOMString*
ResultNamespacesStack::getNamespaceForPrefix(const XalanDOMString&	thePrefix) const
{
	if (m_stackPosition == m_stackBegin)
	{
		return 0;
	}
	else
	{
		return XalanQName::getNamespaceForPrefix(
				m_stackBegin,
				m_stackPosition + 1,
				thePrefix);
	}
}


const XalanDOMString*
ResultNamespacesStack::getPrefixForNamespace(const XalanDOMString&	theNamespaceURI) const
{
	if (m_stackPosition == m_stackBegin)
	{
		return 0;
	}
	else
	{
		return XalanQName::getPrefixForNamespace(
					m_stackBegin,
					m_stackPosition + 1,
					theNamespaceURI);
	}
}


bool
ResultNamespacesStack::prefixIsPresentLocal(const XalanDOMString&	thePrefix)
{
	bool	fResult = false;

	// Check to see if we need to create a new context.  If so, there are
	// no prefixes mapped at this level, so return false...
	if (m_createNewContextStack.back() == false)
	{
		const NamespaceVectorType&	theNamespaces =
			*m_stackPosition;

		NamespaceVectorType::const_iterator			i = theNamespaces.begin();
		const NamespaceVectorType::const_iterator	theEnd = theNamespaces.end();

		while(i != theEnd && fResult == false)
		{
			const NameSpace&		ns = (*i);

			const XalanDOMString&	thisPrefix = ns.getPrefix();

			if(thePrefix == thisPrefix)
			{
				fResult = true;
			}
			else
			{
				++i;
			}
		}
	}

	return fResult;
}


void
ResultNamespacesStack::clear()
{
	// Since we always keep one dummy entry at the beginning,
	// swap with an OutputContextStackType instance of size 1.
	NamespacesStackType(1).swap(m_resultNamespaces);

	m_stackBegin = m_resultNamespaces.begin();

	m_stackPosition = m_stackBegin;

	m_createNewContextStack.clear();
}


XALAN_CPP_NAMESPACE_END