/*

* Copyright (c) 2008-2009 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:  Monitors ID pin change

 *

*/

#ifndef C_USBIDPINOBSERVER_H

#define C_USBIDPINOBSERVER_H

#include <e32base.h>

#include <e32property.h>

/**

 *  Obserber has to implement this interface to get ID Pin change notifications

 *

 */

NONSHARABLE_CLASS( MUsbIdPinObserver)

    {

public:

    /**

     * IdPin disappeared

     */

    virtual void IdPinOffL() = 0;

    /**

     * IdPin appeared

     */

    virtual void IdPinOnL() = 0;

    /**

     * IdPin error

     * @param aError error code

     */

    virtual void IdPinErrorL(TInt aError) = 0;

    };

/**

 *  Class observes ID-PIN property

 *

 */

NONSHARABLE_CLASS( CUsbIdPinObserver) : public CActive

    {

public:

    enum TState

        {

        EIdPinOff = 0, EIdPinOn = 1

        };

    /**

     * Two-phased constructor.

     * @return instance of the objects of this class

     */

    static CUsbIdPinObserver* NewL();

    /**

     * Destructor.

     */

    virtual ~CUsbIdPinObserver();

    /**

     * Returns current state of the IdPin

     * @return state

     */

    TState IdPin() /*  not const - read comment in cpp*/;

    /**

     * Add observer

     * @param aObserver Observer

     */

    void SubscribeL(MUsbIdPinObserver* aObserver);

    /**

     * Remove observer

     * @param aObserver Observer

     */

    void UnsubscribeL(MUsbIdPinObserver* aObserver);

private:

    // From CActive

    /**

     * Request completed

     */

    void RunL();

    /**

     * Request cancelled

     */

    void DoCancel();

    /**

     * RunL leaved

     * @param errorcode from RunL

     * @return errorcode

     */

    TInt RunError(TInt aError);

private:

    /**

     * Default constructor.

     */

    CUsbIdPinObserver();

    /**

     * 2nd phase constructor.

     */

    void ConstructL();

private:

    // data

    /**

     *  The observer reports state changes to its own observers

     * Own

     */

    RPointerArray<MUsbIdPinObserver> iObservers;

    /**

     * The observer observes property change

     */

    RProperty iIdPin;

    };

#endif //  C_USBIDPINOBSERVER_H