/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
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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_InstanceOf_H
#define Patternist_InstanceOf_H

#include "qsinglecontainer_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Implements XPath 2.0's <tt>instance of</tt> expression.
     *
     * @see <a href="http://www.w3.org/TR/xpath20/#id-instance-of">XML Path Language (XPath) 2.0,
     * 3.10.1 Instance Of</a>
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class Q_AUTOTEST_EXPORT InstanceOf : public SingleContainer
    {
    public:

        InstanceOf(const Expression::Ptr &operand,
                   const SequenceType::Ptr &targetType);

        virtual bool evaluateEBV(const DynamicContext::Ptr &) const;

        virtual SequenceType::List expectedOperandTypes() const;
        virtual SequenceType::Ptr staticType() const;
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        /**
         * @returns the SequenceType that this <tt>instance of</tt> Expression
         * is testing its operand against.
         */
        SequenceType::Ptr targetType() const;

    private:
        const SequenceType::Ptr m_targetType;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif
