/*

* Copyright (c) 2007-2009 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:  

*/

#ifndef HARVESTEREVENTOBSERVERAO_H

#define HARVESTEREVENTOBSERVERAO_H

#include <e32base.h>	// For CActive, link against: euser.lib

#include <e32std.h>		// For RTimer, link against: euser.lib

#include <e32msgqueue.h>

#include "harvestercommon.h"

class RHarvesterClient;

class MHarvesterEventObserver;

struct THarvesterEventObserver

	{

	MHarvesterEventObserver& iObserver;

	THarvesterEventObserverInfo iObserverInfo;

	THarvesterEventObserver(MHarvesterEventObserver& aObserver) : iObserver(aObserver) {}

	static TInt CompareObserverIds(

			const THarvesterEventObserver& aFirst, 

			const THarvesterEventObserver& aSecond)

		{

		if( aFirst.iObserverInfo.iObserverId < aSecond.iObserverInfo.iObserverId )

			{

			return -1;

			}

		else if( aFirst.iObserverInfo.iObserverId > aSecond.iObserverInfo.iObserverId )

			{

			return 1;

			}

		else

			{

			return 0;

			}

		}

	};

NONSHARABLE_CLASS( CHarvesterEventObserverAO ) : public CActive

	{

public:

	// Cancel and destroy

	~CHarvesterEventObserverAO();

	// Two-phased constructor.

	static CHarvesterEventObserverAO* NewL( RHarvesterClient& aHC );

	// Two-phased constructor.

	static CHarvesterEventObserverAO* NewLC( RHarvesterClient& aHC );

public:

	// New functions

	// Function for making the initial request

	void AddHarvesterEventObserverL( 

			MHarvesterEventObserver& aHarvesterEventObserver, 

			TInt aHEObserverType,

    		TInt aEventInterval );

	void RemoveHarvesterEventObserverL( MHarvesterEventObserver& aHarvesterEventObserver );

private:	

	// C++ constructor

	CHarvesterEventObserverAO( RHarvesterClient& aHC );

	// Second-phase constructor

	void ConstructL();

	/**

	 * Get next free observer ID

	 * @return Observer ID

	 */

	TUint NextObserverId();

	/**

	 * Get handle to event queue. Creates event queue if it doesn't exist. 

	 * @return Event queue handle

	 */

	RHandleBase& GetEventQueueHandleL();

private:

	// From CActive

	// Handle completion

	void RunL();

	// How to cancel me

	void DoCancel();

	// Override to handle leaves from RunL(). Default implementation causes

	// the active scheduler to panic.

	TInt RunError(TInt aError);

private:	

	RPointerArray<THarvesterEventObserver> iObservers;

	THarvesterEventQueue iHarvesterEventQueue;

	RHarvesterClient& iHarvesterClient;

	};

#endif // HARVESTEREVENTOBSERVERAO_H