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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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qinsertioniterator_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
InsertionIterator::InsertionIterator(const Item::Iterator::Ptr &target,
const xsInteger pos,
const Item::Iterator::Ptr &inserts)
: m_target(target),
m_insertPos(pos),
m_inserts(inserts),
m_position(0),
m_isInserting(pos == 1)
{
Q_ASSERT(target);
Q_ASSERT(inserts);
Q_ASSERT(m_insertPos >= 1);
}
Item InsertionIterator::next()
{
if(m_isInserting)
{
m_current = m_inserts->next();
if(m_current)
{
++m_position;
return m_current;
}
}
else if(m_position == (m_insertPos - 1) && !m_isInserting)
{ /* Entered only the first time insertion starts. */
m_isInserting = true;
return next();
}
++m_position;
m_current = m_target->next();
if(m_current)
return m_current;
else if(m_inserts->position() == -1) /* We're at the end of the both iterators. */
{
m_position = -1;
m_current.reset();
return Item();
}
/* Insert the insertion iterator, since it's still left. */
Q_ASSERT(m_target->position() < m_insertPos);
m_isInserting = true;
m_current = m_inserts->next();
if(m_current)
return m_current;
else
{
/* m_current is already null, so no need to reset it. */
m_position = -1;
return Item();
}
}
xsInteger InsertionIterator::count()
{
return m_target->count() + m_inserts->count();
}
Item InsertionIterator::current() const
{
return m_current;
}
xsInteger InsertionIterator::position() const
{
return m_position;
}
Item::Iterator::Ptr InsertionIterator::copy() const
{
return Item::Iterator::Ptr(new InsertionIterator(m_target->copy(), m_insertPos, m_inserts->copy()));
}
QT_END_NAMESPACE
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