/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
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** GNU Lesser General Public License Usage
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** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU 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 ensure the GNU General
** Public License version 3.0 requirements will be met:
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qcommonsequencetypes_p.h"
#include "qcurrentfn_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

Item CurrentFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    return context->currentItem();
}

Expression::Ptr CurrentFN::compress(const StaticContext::Ptr &context)
{
    m_itemType = context->currentItemType();
    return FunctionCall::compress(context);
}

Expression::Ptr CurrentFN::typeCheck(const StaticContext::Ptr &context,
                                     const SequenceType::Ptr &reqType)
{
    m_itemType = context->currentItemType();
    return FunctionCall::typeCheck(context, reqType);
}

SequenceType::Ptr CurrentFN::staticType() const
{
    if(m_itemType)
        return makeGenericSequenceType(m_itemType, Cardinality::exactlyOne());
    else
        return CommonSequenceTypes::ExactlyOneItem;
}

QT_END_NAMESPACE