/*

* 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 "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: 

*     Class for managing different types of memory on a very abstract level.

*

*/

#ifndef DEVENCSTARTER_MEMORYENTITY_H

#define DEVENCSTARTER_MEMORYENTITY_H

#include <e32base.h>

#include <DevEncConstants.h>

#include "DevEncUiMemInfoObserver.h"

#include <DevEncDiskStatusObserver.h>

class CDevEncSession;

class CDevEncUiInfoObserver;

class CDevEncStarterMemoryEntity : public CBase,

                                   public MDiskStatusObserver

    {

    public:

        /**

         * Constructs the CDevEncStarterMemoryEntity using the NewLC method, popping

         * the constructed object from the CleanupStack before returning it.

         *

         * @return The newly constructed CDevEncStarterMemoryEntity

         */

    	static CDevEncStarterMemoryEntity* NewL( TDevEncUiMemoryType aType );

        /**

         * Constructs the CDevEncStarterMemoryEntity using the constructor and ConstructL

         * method, leaving the constructed object on the CleanupStack before returning it.

         *

         * @return The newly constructed CDevEncStarterMemoryEntity

         */

    	static CDevEncStarterMemoryEntity* NewLC( TDevEncUiMemoryType aType );

    	/**

         * Adds an observer to this object's list of observers.

         * @param aInfoObserver The observer to add

         * @leave Symbian error code

         */

        void AddObserverL( MDevEncUiMemInfoObserver* aInfoObserver );

        /**

         * Removes an observer from this object's list of observers.

         * Any errors are ignored.

         * @param aInfoObserver The observer to remove

         */

        void RemoveObserver( MDevEncUiMemInfoObserver* aInfoObserver );

        /**

         * Called periodically. Not intended for use by other classes.

         * @param aPtr Pointer to an instance of this class.

         */

        static TInt ProgressTick( TAny* aPtr );

        /**

         * Called periodically. Not intended for use by other classes.

         * @param aPtr Pointer to an instance of this class.

         */

        static TInt PollTick( TAny* aPtr );

        /**

        * Destructor.

        */

        virtual ~CDevEncStarterMemoryEntity();

        void Cancel();

        /**

         * Gets the state of this memory entity.

         * @return the current state

         */

        TUint State() const;

        /**

         * Sets the internal state and calls UpdateMemoryInfo()

         * @param aState the new state

         **/

        virtual void SetState( TUint aState );

        /**

         * Sends the current memory state information to all observers.

         * @return none

         */

        virtual void UpdateMemoryInfo();

        /*

         * From MDiskStatusObserver

         */

        void DiskStatusChangedL( TInt aStatus );

    private:

    // functions

        /**

         * C++ Constructor

         **/

        CDevEncStarterMemoryEntity( TDevEncUiMemoryType aType );

        /**

         * Second-phase constructor

         **/

        virtual void ConstructL();

        /**

         * Starts a timer to periodically update the memory state in the UI

         * @param aInterval the polling interval

         **/

        void StartPolling( TTimeIntervalMicroSeconds32 aInterval );

        /**

         * Starts a timer to periodically update the memory state in the UI

         * @param aInterval the polling interval

         **/

        void DoStartPollingL( TTimeIntervalMicroSeconds32 aInterval );

        /**

         * Fetches the encryption state and progress. Called periodically.

         **/

        virtual void CheckProgress();

        /**

         * Performs periodical processing of timeouts. Calls CheckProgress().

         **/

        virtual void DoProgressTick();

        /**

         * Performs periodical processing of timeouts.

         * Checks if the encryption status has changed.

         **/

        virtual void DoPollTick();

    // Data

        /** Owned */

        CPeriodic* iPeriodic;

        /** Owned */

        RArray<MDevEncUiMemInfoObserver*> iObservers;

        /** Owned */

        CDevEncSession* iSession;

        /** Owned */

        CDiskStatusObserver* iDiskStatusObserver;

        TUint iState;

        TUint iPrevState;

        const TDevEncUiMemoryType iType;

        TInt iPercentDone;

        TInt iPrevPercentDone;

    };

#endif	// DEVENCSTARTER_MEMORYENTITY_H