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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://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdistinctiterator_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
DistinctIterator::DistinctIterator(const Item::Iterator::Ptr &seq,
const AtomicComparator::Ptr &comp,
const Expression::ConstPtr &expression,
const DynamicContext::Ptr &context)
: m_seq(seq)
, m_context(context)
, m_expr(expression)
, m_position(0)
{
Q_ASSERT(seq);
prepareComparison(comp);
}
Item DistinctIterator::next()
{
if(m_position == -1)
return Item();
const Item nitem(m_seq->next());
if(!nitem)
{
m_position = -1;
m_current.reset();
return Item();
}
const Item::List::const_iterator end(m_processed.constEnd());
Item::List::const_iterator it(m_processed.constBegin());
for(; it != end; ++it)
{
if(flexibleCompare(*it, nitem, m_context))
{
return next();
}
}
m_current = nitem;
++m_position;
m_processed.append(nitem);
return nitem;
}
Item DistinctIterator::current() const
{
return m_current;
}
xsInteger DistinctIterator::position() const
{
return m_position;
}
Item::Iterator::Ptr DistinctIterator::copy() const
{
return Item::Iterator::Ptr(new DistinctIterator(m_seq->copy(), comparator(), m_expr, m_context));
}
const SourceLocationReflection *DistinctIterator::actualReflection() const
{
return m_expr.data();
}
QT_END_NAMESPACE
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