/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** GNU General Public License Usage
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** Foundation and appearing in the file LICENSE.GPL 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_CurrentItemStore_H
#define Patternist_CurrentItemStore_H

#include <private/qsinglecontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Creates a DynamicContext which provides the focus item for the
     * function @c fn:current().
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     * @since 4.5
     */
    class CurrentItemStore : public SingleContainer
    {
    public:
        CurrentItemStore(const Expression::Ptr &operand);

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

        virtual SequenceType::List expectedOperandTypes() const;
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
                                          const SequenceType::Ptr &reqType);

        virtual Properties properties() const;

        /**
         * @returns the staticType() of its operand.
         */
        virtual SequenceType::Ptr staticType() const;
        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
        virtual const SourceLocationReflection *actualReflection() const;

    private:
        static inline StaticContext::Ptr newStaticContext(const StaticContext::Ptr &context);
        inline DynamicContext::Ptr createContext(const DynamicContext::Ptr &old) const;
    };
}

QT_END_NAMESPACE

#endif
