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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the Qt Mobility Components.

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** 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

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** 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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**

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** $QT_END_LICENSE$

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

#ifndef GCONFLAYER_H

#define GCONFLAYER_H

#include "qvaluespace_p.h"

#include "qvaluespacepublisher.h"

#include <QSet>

QTM_BEGIN_NAMESPACE

class GConfLayer : public QAbstractValueSpaceLayer

{

    Q_OBJECT

public:

    GConfLayer();

    virtual ~GConfLayer();

protected:

    /*virtual*/ QString name();

    /*virtual*/ bool startup(Type type);

    /*virtual*/ QUuid id();

    /*virtual*/ unsigned int order();

    /*virtual*/ Handle item(Handle parent, const QString &subPath);

    /*virtual*/ void removeHandle(Handle handle);

    /*virtual*/ void setProperty(Handle handle, Properties properties);

    /*virtual*/ bool value(Handle handle, QVariant *data);

    /*virtual*/ bool value(Handle handle, const QString &subPath, QVariant *data);

    /*virtual*/ QSet<QString> children(Handle handle);

    /*virtual*/ QValueSpace::LayerOptions layerOptions() const;

    /* QValueSpaceSubscriber functions */

    /*virtual*/ bool supportsInterestNotification() const;

    /*virtual*/ bool notifyInterest(Handle handle, bool interested);

    /* QValueSpacePublisher functions */

    /*virtual*/ bool setValue(QValueSpacePublisher *creator, Handle handle,

                              const QString &subPath, const QVariant &value);

    /*virtual*/ bool removeValue(QValueSpacePublisher *creator, Handle handle,

                                 const QString &subPath);

    /*virtual*/ bool removeSubTree(QValueSpacePublisher *creator, Handle handle);

    /*virtual*/ void addWatch(QValueSpacePublisher *creator, Handle handle);

    /*virtual*/ void removeWatches(QValueSpacePublisher *creator, Handle parent);

    /*virtual*/ void sync();

public:

    static GConfLayer *instance();

private:

    struct GConfHandle {

        GConfHandle(const QString &p)

        :   path(p), refCount(1)

        {

        }

        QString path;

        unsigned int refCount;

    };

    QHash<QString, GConfHandle *> m_handles;

    GConfHandle *gConfHandle(Handle handle)

    {

        if (handle == InvalidHandle)

            return 0;

        GConfHandle *h = reinterpret_cast<GConfHandle *>(handle);

        if (m_handles.values().contains(h))

            return h;

        return 0;

    }

private:    //data

};

QTM_END_NAMESPACE

#endif //GCONFLAYER_H