/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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 __CALENDARNOTIFY_H

#define __CALENDARNOTIFY_H

class MCalCallbackBase;

class CAsyncRequestObserver;

/**

 *This class implements CalendarNotify SAPI core logic.It includes  

 * methods for notification of changes in calendar.

 * 

 */

class CCalendarObserver : public CCalendarASyncRequest, /*public CActive, */public MCalChangeCallBack2

	{

	public:

		/**

		 * Two-phased constructor.

		 * @param CCalendarSessionInfo* a calendar session information.

		 * @param aFilter* Filter object. 

		 * @param aAsyncRequestObserver Asynchronous request observer

	     * @param aNotifyCallback Callback Object for Change notification. 

		*/

		static CCalendarObserver* NewL( CCalendarSessionInfo* aSessionInfo, 

											CCalendarFilter* aFilter, 

											CAsyncRequestObserver* aAsyncRequestObserver,

											MCalCallbackBase* aNotifyCallback );

		/**

		* Start the notification process

		*/

		void StartChangeNotificationL();

		/**

	     * Destructor.

    	*/

		virtual ~CCalendarObserver();

		/**

		 * Inherited from MCalChangeCallBack2 class 

		*/ 

		virtual void CalChangeNotification(RArray< TCalChangeEntry > &aChangeItems);		

		virtual TBool IsInProgress();

	private:

		/** 

	     * Default  constructor.

	     * @param aSessionInfo  It is an object of CCalSession Class which

	     *        represents a channel of communication between a client thread  

	     *        and the calendar Server thread .

	     * @param aNotifyCallback It is a callback notification

	    */

		CCalendarObserver( CCalendarSessionInfo* aSessionInfo, 

									CAsyncRequestObserver* aAsyncRequestObserver, 

									MCalCallbackBase* aNotifyCallback );

		void ConstructL( CCalendarFilter* aFilter );

		/**

		 * Inherited from CActive class 

		*/ 

    	virtual void DoCancel();

		/**

		 * Inherited from CActive class 

		*/ 

        virtual void RunL();

		/**

		 * Activates the request and call SetActive() function

		*/ 

		void ActivateRequest(TInt aReason);

		/**

		 * Gives the result for notification request.

		*/ 

		void NotifyRequestResult(TInt aReason);

	private:

		/**

		 * Calendar server session

		*/ 

		CCalendarSessionInfo* iSessionInfo;

		/**

		 * Calendar server session for notifications

		*/ 

		CCalSession* 			iSession;

		/**

		 * Callback Object

		*/ 

		MCalCallbackBase* iNotifyCallback;

		/**

		 * Filter Object

		*/ 

		CCalendarFilter* iFilter;

		/**

		 * Asynchronous request observer, Used to get infromed of completion or request

		*/ 

		CAsyncRequestObserver* 	iAsyncRequestObserver;

		TBool			iIsInProgress;

	};

#endif __CALENDARNOTIFY_H