/*

* Copyright (c) 2006-2009 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:

*

*/

/**

 @file

 @internalTechnology 

*/

#ifndef HWRMEXTENDEDLIGHTSTATUSOBSERVER_H

#define HWRMEXTENDEDLIGHTSTATUSOBSERVER_H

// INCLUDES

#include <e32base.h>

#include <hwrm/hwrmextendedlight.h>

#include <e32property.h>

#include "HWRMCmn.h"

// FORWARD DECLARATIONS

// None

/**

* Active object wrapper for Publish and Subscribe one-shot notification handling.

* Listens for changes in light status and notifies the client.

*

*/

NONSHARABLE_CLASS(CHWRMExtendedLightStatusObserver) : public CActive

    {

    public:

        /**

        * This is a two-phase constructor method that is used to

        * create a new instance of CHWRMExtendedLightStatusObserver.

        * A newly created instance immediately starts listening to light status changes.

        *

        * @param aCallback Pointer to a callback instance. Can be NULL.

        * @param aSupportedTargets Mask of supported targets.

        * @return A pointer to a new instance of the CHWRMExtendedLightStatusObserver class.

        */

        static CHWRMExtendedLightStatusObserver* NewL(MHWRMExtendedLightObserver* aCallback,

                                                      TInt aSupportedTargets);

        /**

        * Destructor.

        */

        virtual ~CHWRMExtendedLightStatusObserver();

        /**

        * This method retrieves the current light status. 

        *

        * @return TLightStatus indicating the current light status

        */

        CHWRMExtendedLight::TLightStatus CurrentStatus(TInt aTarget) const;

    protected:

        // From CActive

        void RunL();

        void DoCancel();

    private:

        /**

        * Constructor

        *

        * @param aCallback Pointer to a callback instance.

        * @param aSupportedTargets Mask of supported targets.

        */

        CHWRMExtendedLightStatusObserver(MHWRMExtendedLightObserver* aCallback,

                                         TInt aSupportedTargets);

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /*

        * Order notification

        */

        void OrderNotification();

        /**

        * Notifies the callback about value changes.

        *

        * @param aStatusList New status values obtained from P&S

        */

        void NotifyCallback( RLightStatusArray& aStatusList  );

        /**

        * Finds item from iLastStatusValue by target.

        */

        static TInt FindByTarget( const TInt* aTarget, 

                                  const THWRMStatusInfo& aItem );

        /**

        * Initializes RLightStatusArray.

        */

        TInt InitializeStatusArray( RLightStatusArray& aArray ) const;

    private:

        MHWRMExtendedLightObserver* iCallback; // Not owned by this class. Can be NULL.

        RProperty iProperty;           // P&S property

        TInt iSupportedTargets;        // Mask of supported targets

        RLightStatusArray iLastStatusValue; // Keeps track of last received status value

        RLightStatusArray iStatusUnknownList; // All targets status unknown, RunError() uses.

    };

#endif      // HWRMLIGHTSTATUSOBSERVER_H

// End of File