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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 "qabstractfloat_p.h"

#include "qdecimal_p.h"

#include "qcastingplatform_p.h"

#include "qcomparisonplatform_p.h"

#include "qliteral_p.h"

#include "qaggregator_p.h"

#include "quntypedatomicconverter_p.h"

#include "qpatternistlocale_p.h"

QT_BEGIN_HEADER

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.cpp"

    /**

     * @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

QT_END_HEADER

#endif