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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_ItemVerifier_H
#define Patternist_ItemVerifier_H

#include <private/qsinglecontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Verifies that the items in a sequence an Expression evaluates
     * is of a certain ItemType.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class ItemVerifier : public SingleContainer
    {
    public:

        ItemVerifier(const Expression::Ptr &operand,
                     const ItemType::Ptr &reqType,
                     const ReportContext::ErrorCode errorCode);

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

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

        inline Item mapToItem(const Item &, const DynamicContext::Ptr &) const;
        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
        virtual const SourceLocationReflection *actualReflection() const;

    private:
        typedef QExplicitlySharedDataPointer<const ItemVerifier> ConstPtr;
        inline void verifyItem(const Item &item,
                               const DynamicContext::Ptr &context) const;

        const ItemType::Ptr             m_reqType;
        const ReportContext::ErrorCode  m_errorCode;
    };
}

QT_END_NAMESPACE

#endif