/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Disk space watcher, information about low disk space.

*

*/

#ifndef IRQDISKSPACEWATCHER_H_

#define IRQDISKSPACEWATCHER_H_

#include <QObject>

#include <QtGlobal>

#include "irqdiskspaceobserverinterface.h"  // MIRQDiskSpaceObserver

class IRQDiskSpaceObserver;

class IRQDiskSpaceWatcher : public QObject, 

                            public MIRQDiskSpaceObserver

{

    Q_OBJECT

public:

    /*!

     * Constructor.

     */

    IMPORT_C IRQDiskSpaceWatcher();

    /*!

     * Destructor.

     */    

    IMPORT_C ~IRQDiskSpaceWatcher();

public:   

    /*!

     *  start monitoring disk space change

     *  @param aCriticalLevel critical level which is been observed.

     *                        can NOT less than 0

     */

    IMPORT_C bool startMonitorDrive(const qint64 aCriticalLevel);

    IMPORT_C bool startMonitorDrive();

    /*!

     *  stop monitoring disk space change

     */    

    IMPORT_C void stopMonitorDrive();

    /**

     * @return critical level which is been observed.

     *         if -1 is returned, indicates watcher can NOT work

     */

    IMPORT_C qint64 criticalLevel() const;

    /**

     * Returns whether or disk defined by parameter 

     * contains less than the critical level free disk space.

     *

     * @param aCriticalLevel critical level which is been observed.

     * @return true if there is less free disk space than the critical 

     * level, otherwise false.

     */

    IMPORT_C bool isBelowCriticalLevel(const qint64 aCriticalLevel );

    IMPORT_C bool isBelowCriticalLevel();    

public:      

    /*!

     * From MIRQDiskSpaceObserver.

     */  

    void notifyLowDiskSpace(const qint64 aCriticalLevel);

signals:

    void diskSpaceLow(qint64 aCriticalLevel); 

private:

    IRQDiskSpaceObserver*  iDiskSpaceObserver;

    qint64  iDefaultLevel;

};

#endif // IRQDISKSPACEWATCHER_H_