/****************************************************************************
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** Copyright (C) 2012 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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** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
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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 "qsinglecontainer_p.h"

QT_BEGIN_HEADER

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

QT_END_HEADER

#endif