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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_ComparingAggregator_H
#define Patternist_ComparingAggregator_H

/**
 * @file qcomparingaggregator_p.h
 * @short Contains the implementations for the functions <tt>fn:max()</tt>, MaxFN,
 * and <tt>fn:min()</tt>, MinFN, and the class ComparingAggregator.
 */

#include <private/qabstractfloat_p.h>
#include <private/qdecimal_p.h>
#include <private/qcastingplatform_p.h>
#include <private/qcomparisonplatform_p.h>
#include <private/qliteral_p.h>
#include <private/qaggregator_p.h>
#include <private/quntypedatomicconverter_p.h>
#include <private/qpatternistlocale_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Base class for the implementations of the <tt>fn:min()</tt> and <tt>fn:max()</tt> function.
     *
     * What function that more specifically is
     * followed, depends on how the constructor is called.
     *
     * @see MaxFN
     * @see MinFN
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    template <AtomicComparator::Operator oper, AtomicComparator::ComparisonResult result>
    class ComparingAggregator : public Aggregator,
                                public ComparisonPlatform<ComparingAggregator<oper, result>,
                                                          true, AtomicComparator::AsValueComparison,
                                                          ReportContext::FORG0006>,
                                public CastingPlatform<ComparingAggregator<oper, result>, true>
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
                                          const SequenceType::Ptr &reqType);

        inline AtomicComparator::Operator operatorID() const
        {
            return oper;
        }

        inline ItemType::Ptr targetType() const
        {
            return BuiltinTypes::xsDouble;
        }

    private:
        inline Item applyNumericPromotion(const Item &old,
                                               const Item &nev,
                                               const Item &newVal) const;

        using ComparisonPlatform<ComparingAggregator<oper, result>,
                                 true,
                                 AtomicComparator::AsValueComparison,
                                 ReportContext::FORG0006>::comparator;
        using ComparisonPlatform<ComparingAggregator<oper, result>,
                                 true,
                                 AtomicComparator::AsValueComparison,
                                 ReportContext::FORG0006>::fetchComparator;
        using CastingPlatform<ComparingAggregator<oper, result>, true>::cast;
    };

#include "qcomparingaggregator_tpl_p.h"

    /**
     * @short An instantiation of ComparingAggregator suitable for <tt>fn:max()</tt>.
     *
     * @ingroup Patternist_functions
     */
    typedef ComparingAggregator<AtomicComparator::OperatorGreaterThan, AtomicComparator::GreaterThan> MaxFN;

    /**
     * @short An instantiation of ComparingAggregator suitable for <tt>fn:max()</tt>.
     *
     * @ingroup Patternist_functions
     */
    typedef ComparingAggregator<AtomicComparator::OperatorLessThan, AtomicComparator::LessThan> MinFN;
}

QT_END_NAMESPACE

#endif
