/****************************************************************************
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** Copyright (C) 2014 Digia Plc 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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****************************************************************************/

//
//  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_DeduplicateIterator_H
#define Patternist_DeduplicateIterator_H

#include <QList>

#include <private/qexpression_p.h>
#include <private/qitem_p.h>
#include <private/qatomiccomparator_p.h>
#include <private/qcomparisonplatform_p.h>
#include <private/qsourcelocationreflection_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Performs deduplication of the nodes on its source list.
     *
     * @note The nodes in the source list must be in document order.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_iterators
     */
    class DeduplicateIterator : public ListIterator<Item>
    {
    public:
        DeduplicateIterator(const Item::List &source);

        virtual Item next();
        virtual Item::Iterator::Ptr copy() const;
        virtual xsInteger count();

    private:
        /**
         * m_position in ListIteratorPlatform is the position that we
         * show to the outside through position) but do not correspond
         * to the position in m_list, since we skip entries in that one.
         *
         * However, this guy, m_listPos, is the position into m_list.
         */
        int m_listPos;
    };
}

QT_END_NAMESPACE

#endif