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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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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_CopyOf_H
#define Patternist_CopyOf_H

#include <private/qsinglecontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Does node copying in a parameterized way, in order to deal with
     * namespace preservation/inheritance.
     *
     * If someone tries to call evaluateEBV(), evaluateSingleton() or
     * evaluateSequence() on us, we will infinitely loop. But apparently
     * that's not possible because we're always a child of ElementConstructor,
     * currently.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class CopyOf : public SingleContainer
    {
    public:
        /**
         * Creats a CopyOf where it is checked that the expression @p operand conforms
         * to the type @p reqType.
         */
        CopyOf(const Expression::Ptr &operand,
               const bool inheritNSS,
               const bool preserveNSS);

        virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;

        /**
         * @returns always the SequenceType passed in the constructor to this class. That is, the
         * SequenceType that the operand must conform to.
         */
        virtual SequenceType::Ptr staticType() const;

        /**
         * @returns a list containing one CommonSequenceTypes::ZeroOrMoreItems
         */
        virtual SequenceType::List expectedOperandTypes() const;

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

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

        virtual Expression::Ptr compress(const StaticContext::Ptr &context);

        virtual Properties properties() const;
        virtual ItemType::Ptr expectedContextItemType() const;

    private:
        typedef QExplicitlySharedDataPointer<const CopyOf> ConstPtr;
        const bool                                      m_inheritNamespaces;
        const bool                                      m_preserveNamespaces;
        const QAbstractXmlNodeModel::NodeCopySettings   m_settings;
    };
}

QT_END_NAMESPACE

#endif