/*

* Copyright (c) 2002 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:  

*     Messaging Centre application's engine class that reads events from

*     log DB.

*

*/

#ifndef __Mce_Engine_CMceLogEngineReader_H__

#define __Mce_Engine_CMceLogEngineReader_H__

// INCLUDES

#include <e32base.h>

#include <f32file.h>

#include <logviewchangeobserver.h>

#include "MceLogEngine.h"

#include "MceLogEngine.hrh"

// FORWARD DECLARATIONS

class CLogClient;

class CLogViewEvent;

class CMceLogEngine;

// CLASS DECLARATION

/**

 * Implements the functionality to read log events from DB.

 */

class CMceLogEngineReader : public CActive, public MLogViewChangeObserver

    {

    public:

        /**

         * Standard creation function.

         *

         * @param aObserver     Pointer to observer.

         * @return pointer to CMceLogEngineReader instance.

         */

        static CMceLogEngineReader* NewL(CMceLogEngine* aObserver);

        /**

         * Destructor. 

         */

        ~CMceLogEngineReader();

        /**

         * Starts reading the entries from log database.

         *

         * @param aFirstime If ETrue reading is started from setting the filter.

         */

        void StartReadingL();

        /**

         * Clear DR list

         *

         */

        void ClearDrListL();

    private:

        /**

         * Second phase of construction.

         */

        void ConstructL();

        /**

         * Default constructor.

         */

        CMceLogEngineReader();

        /**

         * Constructor.

         *

         * @param aObserver     Pointer to observer.

         */

        CMceLogEngineReader( CMceLogEngine* aObserver );

        /**

         * Set filters to fetch only events of certain type.

         */

        void SetSpecialFilterL();

    private: // From CActive

        void DoCancel();

        void RunL();

        TInt RunError(TInt aError);

    public: // from MLogViewChangeObserver

        void HandleLogViewChangeEventAddedL(TLogId aId,   TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount);

        void HandleLogViewChangeEventChangedL(TLogId aId,   TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount);

        void HandleLogViewChangeEventDeletedL(TLogId aId,   TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount);

    private: // data

        /// Ref: Logs's engine

        CMceLogEngine* iObserver;

        /// Own: File server session

        RFs iFsSession;

        /// Own: Log engine

        CLogClient* iLogClient;

        /// Own: View to filtered events.

        CLogViewEvent* iLogViewEvent; 

        /// Own: Reader's state

        TMceLogEngineReaderState iReaderState;

        /// Own: Filterlist

        CLogFilterList* iFilterList;

        /// Own: How many events has been read.

        TInt iEventCounter;

        /// Own: Indicator if observer's array was reset

        TBool   iArrayReset;

        /// Own: Amount of event in view

        TInt iEventsInView;

    };

#endif // __Mce_Engine_CMceLogEngineReader_H__

// End of file