/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
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** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** 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
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
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** 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 "qboolean_p.h"
#include "qcommonvalues_p.h"
#include "qdynamiccontext_p.h"

#include "qexternalvariableloader_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ExternalVariableLoader::~ExternalVariableLoader()
{
}


SequenceType::Ptr ExternalVariableLoader::announceExternalVariable(const QXmlName name,
                                                                   const SequenceType::Ptr &declaredType)
{
    Q_ASSERT(!name.isNull());
    Q_ASSERT(declaredType);
    Q_UNUSED(name); /* Needed when compiling in release mode. */
    Q_UNUSED(declaredType); /* Needed when compiling in release mode. */

    return SequenceType::Ptr();
}

Item::Iterator::Ptr ExternalVariableLoader::evaluateSequence(const QXmlName name,
                                                             const DynamicContext::Ptr &context)
{
    Q_ASSERT(!name.isNull());
    const Item item(evaluateSingleton(name, context));

    if(item)
        return makeSingletonIterator(item);
    else
        return CommonValues::emptyIterator;
}

Item ExternalVariableLoader::evaluateSingleton(const QXmlName name,
                                                    const DynamicContext::Ptr &context)
{
    Q_ASSERT(!name.isNull());
    return Boolean::fromValue(evaluateEBV(name, context));
}

bool ExternalVariableLoader::evaluateEBV(const QXmlName name,
                                         const DynamicContext::Ptr &context)
{
    Q_ASSERT(!name.isNull());
    return Boolean::evaluateEBV(evaluateSequence(name, context), context);
}

QT_END_NAMESPACE