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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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_UnionIterator_H
#define Patternist_UnionIterator_H
#include "qitem_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements the @c except operator. That is, the computation
* of the sequence of nodes from one sequence, that doesn't appear in the
* other.
*
* @ingroup Patternist_iterators
*/
class UnionIterator : public Item::Iterator
{
public:
/**
* It is assumed that @p it1 and @p it2 are in document order and
* without duplicates.
*/
UnionIterator(const Item::Iterator::Ptr &it1,
const Item::Iterator::Ptr &it2);
virtual Item next();
virtual Item current() const;
virtual xsInteger position() const;
virtual Item::Iterator::Ptr copy() const;
private:
inline Item nextFromFirstOperand()
{
++m_position;
m_current = m_node1;
m_node1 = m_it1->next();
return m_current;
}
const Item::Iterator::Ptr m_it1;
const Item::Iterator::Ptr m_it2;
Item m_current;
xsInteger m_position;
Item m_node1;
Item m_node2;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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