/*

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

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

* 

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program.  If not, 

* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".

*

* Description:

*

*/

#ifndef SETTINGSHANDLERBASE_H

#define SETTINGSHANDLERBASE_H

// INCLUDES

#include <QVariant>

#include "xqsettingsmanager.h"

#include <exception>

#include <e32base.h>

// FORWARD DECLARATIONS

class XQSettingsKey;

class MSettingsHandlerObserver

{

public:

    virtual void valueChanged(const XQSettingsKey& key, XQSettingsManager::Type type) = 0;

    virtual void itemDeleted(const XQSettingsKey& key) = 0;

};

class SettingsHandlerBase

{

public:

    virtual ~SettingsHandlerBase() {};

    virtual void setObserver(MSettingsHandlerObserver* observer) = 0;

    QVariant handleReadItemValue(const XQSettingsKey& key, XQSettingsManager::Type type, TInt& error);

    bool handleWriteItemValue(const XQSettingsKey& key, const QVariant& value, TInt& error);

    virtual bool handleStartMonitoring(const XQSettingsKey& key, XQSettingsManager::Type type, MSettingsHandlerObserver& observer, TInt& error) = 0;

    virtual bool handleStopMonitoring(const XQSettingsKey& key, TInt& error) = 0;

protected:

    virtual TInt getValue(unsigned long key, TInt& value) = 0;

    virtual TInt getValue(unsigned long key, TReal& value) = 0;

    virtual void getValueL(unsigned long key, RBuf8& value) = 0;

    virtual void getValueL(unsigned long key, RBuf16& value) = 0;

    virtual TInt setValue(unsigned long key, const TInt& value) = 0;

    virtual TInt setValue(unsigned long key, const TReal& value) = 0;

    virtual TInt setValue(unsigned long key, const TDesC8& value) = 0;

    virtual TInt setValue(unsigned long key, const TDesC16& value) = 0;

};

#endif //SETTINGSHANDLERBASE_H