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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qitem_p.h"
#include "qexceptiterator_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
ExceptIterator::ExceptIterator(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 ExceptIterator::fromFirstOperand()
{
++m_position;
m_current = m_node1;
m_node1 = m_it1->next();
return m_current;
}
Item ExceptIterator::next()
{
while(true)
{
if(!m_node1)
{
m_position = -1;
m_current = Item();
return Item();
}
else if(!m_node2)
return fromFirstOperand();
if(m_node1.asNode().model() != m_node2.asNode().model())
return fromFirstOperand();
switch(m_node1.asNode().compareOrder(m_node2.asNode()))
{
case QXmlNodeModelIndex::Precedes:
return fromFirstOperand();
case QXmlNodeModelIndex::Follows:
{
m_node2 = m_it2->next();
if(m_node2)
continue;
else
return fromFirstOperand();
}
default:
{
m_node1 = m_it1->next();
m_node2 = m_it2->next();
}
}
}
}
Item ExceptIterator::current() const
{
return m_current;
}
xsInteger ExceptIterator::position() const
{
return m_position;
}
Item::Iterator::Ptr ExceptIterator::copy() const
{
return Item::Iterator::Ptr(new ExceptIterator(m_it1->copy(), m_it2->copy()));
}
QT_END_NAMESPACE
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