/*
 * 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 "OutputContextStack.hpp"



#include <xalanc/PlatformSupport/DOMStringHelper.hpp>


XALAN_CPP_NAMESPACE_BEGIN



OutputContextStack::OutputContextStack(MemoryManagerType& theManager) :
	m_stack(theManager, 1 ),
	m_stackPosition(m_stack.begin()),
	m_stackSize(0)
{
	// m_stack is initialized to a size of 1, so that
	// we always have a dummy entry at the beginning
	// of the deque.  This makes the implementation
	// much simpler.
}



OutputContextStack::~OutputContextStack()
{
}



void
OutputContextStack::pushContext(FormatterListener*	theListener)
{
	++m_stackPosition;
	++m_stackSize;

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

		m_stackPosition = m_stack.end() - 1;
	}

	if (theListener != 0)
	{
		(*m_stackPosition).m_flistener  = theListener;
	}
}



void
OutputContextStack::popContext()
{
	assert(m_stackPosition != m_stack.begin());

	OutputContext&	theCurrentContext = *m_stackPosition;

	theCurrentContext.reset();


	--m_stackPosition;
	--m_stackSize;
}



void
OutputContextStack::clear()
{
	// Since we always keep one dummy entry at the beginning,
	// swap with an OutputContextStackType instance of size 1.
	OutputContextStackType	temp( XalanMemMgrs::getDummyMemMgr(), 1);
	temp.swap(m_stack);

	m_stackPosition = m_stack.begin();

	m_stackSize = 0;
}



void
OutputContextStack::reset()
{
	while(m_stackPosition != m_stack.begin())
	{
		popContext();
	}

	assert(empty() == true);
}



XALAN_CPP_NAMESPACE_END
