/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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****************************************************************************/

#include "qitem_p.h"

#include "qintersectiterator_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

IntersectIterator::IntersectIterator(const Item::Iterator::Ptr &it1,

                                     const Item::Iterator::Ptr &it2) : m_it1(it1),

                                                                       m_it2(it2),

                                                                       m_position(0),

                                                                       m_node1(m_it1->next()),

                                                                       m_node2(m_it2->next())

{

    Q_ASSERT(m_it1);

    Q_ASSERT(m_it2);

}

Item IntersectIterator::next()

{

    if(!m_node1 || !m_node2)

        return closedExit();

    do

    {

        if(m_node1.asNode().model() == m_node2.asNode().model())

        {

            switch(m_node1.asNode().compareOrder(m_node2.asNode()))

            {

                case QXmlNodeModelIndex::Precedes:

                {

                    m_node1 = m_it1->next();

                    break;

                }

                case QXmlNodeModelIndex::Follows:

                {

                    m_node2 = m_it2->next();

                    break;

                }

                default:

                {

                    m_current = m_node2;

                    m_node1 = m_it1->next();

                    m_node2 = m_it2->next();

                    ++m_position;

                    return m_current;

                }

            }

        }

        else

            m_node2 = m_it2->next();

    }

    while(m_node1 && m_node2);

    return Item();

}

Item IntersectIterator::current() const

{

    return m_current;

}

xsInteger IntersectIterator::position() const

{

    return m_position;

}

Item::Iterator::Ptr IntersectIterator::copy() const

{

    return Item::Iterator::Ptr(new IntersectIterator(m_it1->copy(), m_it2->copy()));

}

QT_END_NAMESPACE