/****************************************************************************

**

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, 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

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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_VARIABLELOADER_P_H

#define PATTERNIST_VARIABLELOADER_P_H

#include <QtCore/QSet>

#include <QtXmlPatterns/QXmlQuery>

#include <QtDebug>

#include "qdynamiccontext_p.h"

#include "qexternalvariableloader_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    class VariableLoader : public ExternalVariableLoader

    {

    public:

        typedef QHash<QXmlName, QVariant> BindingHash;

        typedef QExplicitlySharedDataPointer<VariableLoader> Ptr;

        inline VariableLoader(const NamePool::Ptr &np,

                              const VariableLoader::Ptr &previousLoader = VariableLoader::Ptr()) : m_namePool(np)

                                                                                                 , m_previousLoader(previousLoader)

        {

        }

        virtual QPatternist::SequenceType::Ptr announceExternalVariable(const QXmlName name,

                                                                        const QPatternist::SequenceType::Ptr &declaredType);

        virtual QPatternist::Item::Iterator::Ptr evaluateSequence(const QXmlName name,

                                                                  const QPatternist::DynamicContext::Ptr &);

        virtual QPatternist::Item evaluateSingleton(const QXmlName name,

                                                    const QPatternist::DynamicContext::Ptr &);

        void removeBinding(const QXmlName &name);

        bool hasBinding(const QXmlName &name) const;

        QVariant valueFor(const QXmlName &name) const;

        void addBinding(const QXmlName &name,

                        const QVariant &value);

        bool isSameType(const QVariant &v1,

                        const QVariant &v2) const;

        bool invalidationRequired(const QXmlName &name,

                                  const QVariant &variant) const;

    private:

        inline QPatternist::Item itemForName(const QXmlName &name) const;

        const NamePool::Ptr                 m_namePool;

        VariableLoader::Ptr                 m_previousLoader;

        BindingHash                         m_bindingHash;

    };

}

QT_END_NAMESPACE

Q_DECLARE_METATYPE(QIODevice *)

Q_DECLARE_METATYPE(QXmlQuery)

QT_END_HEADER

#endif