/*

* Copyright (c) 2008 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:  AT NVRAM status change listener and notifier

*

*/

#ifndef C_CDUNATNVRAMLISTEN_H

#define C_CDUNATNVRAMLISTEN_H

#include <atext.h>

#include <atextcommon.h>

#include "DunTransporter.h"

/**

 *  Class for AT NVRAM status change listener

 *

 *  @lib dunatext.lib

 */

NONSHARABLE_CLASS( CDunAtNvramListen ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aAtCmdExt Pointer to AT command extension

     * @param aAtCmdExtCommon Pointer to AT command extension to common

     *                        functionality

     * @return Instance of self

     */

	static CDunAtNvramListen* NewL( RATExt* aAtCmdExt,

	                                RATExtCommon* aAtCmdExtCommon );

    /**

     * Two-phased constructor.

     * @param aAtCmdExt Pointer to AT command extension

     * @param aAtCmdExtCommon Pointer to AT command extension to common

     *                        functionality

     * @return Instance of self

     */

    static CDunAtNvramListen* NewLC( RATExt* aAtCmdExt,

                                     RATExtCommon* aAtCmdExtCommon );

    /**

    * Destructor.

    */

    virtual ~CDunAtNvramListen();

    /**

     * Resets data to initial values

     *

     * @return None

     */

    void ResetData();

    /**

     * Starts waiting for NVRAM status changes

     *

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt IssueRequest();

    /**

     * Stops waiting for NVRAM status changes

     *

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt Stop();

private:

    CDunAtNvramListen( RATExt* aAtCmdExt,

                       RATExtCommon* aAtCmdExtCommon );

    void ConstructL();

    /**

     * Initializes this class

     *

     * @return None

     */

    void Initialize();

// from base class CActive

    /**

     * From CActive.

     * Gets called when NVRAM has changed

     *

     * @return None

     */

    void RunL();

    /**

     * From CActive.

     * Gets called on cancel

     *

     * @return None

     */

    void DoCancel();

private:  // data

    /**

     * AT command extension

     * Not own.

     */

    RATExt* iAtCmdExt;

    /**

     * AT command extension to common functionality

     * Not own.

     */

    RATExtCommon* iAtCmdExtCommon;

    /**

     * Current state of NVRAM status change listening; active or inactive

     */

    TDunState iNvramHandleState;

    /**

     * Buffer for NVRAM

     */

    TBuf8<KDefaultNvramBufLength> iNvramBuffer;

    /**

     * Flag to indicate start of receiving

     */

    TBool iStarted;

    };

#endif  // C_CDUNATNVRAMLISTEN_H