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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_CollationChecker_H
#define Patternist_CollationChecker_H

#include <private/qsinglecontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Checks that its operand evaluates to a supported string collation.
     *
     * CollationChecker is inserted in the AST when an Expression has LastOperandIsCollation
     * set. If the argument that CollationChecker is a string literal the CollationChecker
     * will const-fold as usual, but otherwise will simply pipe through the value of its argument,
     * if it's a supported collation. Otherwise it raise an error, with code ReportContext::FOCH0002.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class CollationChecker : public SingleContainer
    {
    public:
        CollationChecker(const Expression::Ptr &source);

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

        /**
         * Expects exactly one string.
         */
        virtual SequenceType::List expectedOperandTypes() const;

        /**
         * @returns its operand's static type.
         */
        virtual SequenceType::Ptr staticType() const;

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

QT_END_NAMESPACE

#endif
