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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_UntypedAtomicConverter_H
#define Patternist_UntypedAtomicConverter_H

#include "qitem_p.h"
#include "qsinglecontainer_p.h"
#include "qcastingplatform_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Casts every item in a sequence obtained from
     * evaluating an Expression, to a requested atomic type.
     *
     * The atomic values it casts from are instances of xs:untypedAtomic(hence
     * the name). Typically, the items are from an Atomizer. UntypedAtomicConverter
     * implements the automatic conversion which typically is activated when XPath
     * is handling untyped data.
     *
     * @see <a href="http://www.w3.org/TR/xpath20/#id-function-calls">XML Path
     * Language (XPath) 2.0, 3.1.5 Function Calls, in particular the
     * Function Conversion Rules</a>
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class UntypedAtomicConverter : public SingleContainer,
                                   public CastingPlatform<UntypedAtomicConverter, true>
    {
    public:
        UntypedAtomicConverter(const Expression::Ptr &operand,
                               const ItemType::Ptr &reqType,
                               const ReportContext::ErrorCode code = ReportContext::FORG0001);

        virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;

        virtual SequenceType::Ptr staticType() const;
        virtual SequenceType::List expectedOperandTypes() const;

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        /**
         * Overridden to call CastingPlatform::typeCheck()
         */
        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
                                          const SequenceType::Ptr &reqType);

        inline Item mapToItem(const Item &item,
                              const DynamicContext::Ptr &context) const;

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

        virtual const SourceLocationReflection *actualReflection() const;

    private:
        typedef QExplicitlySharedDataPointer<const UntypedAtomicConverter> ConstPtr;
        const ItemType::Ptr m_reqType;
    };

    Item UntypedAtomicConverter::mapToItem(const Item &item, const DynamicContext::Ptr &context) const
    {
        return cast(item, context);
    }
}

QT_END_NAMESPACE

QT_END_HEADER

#endif
