/*

* Copyright (c) 2010 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:

*

*/

#ifndef C_USBVBUSOBSERVER_H

#define C_USBVBUSOBSERVER_H

#include <e32base.h>

#include <StifTestModule.h>

#include <StifLogger.h>

#include "tassertbase.h"

class RUsb;

class MUsbVBusObserver

    {

public:

    void virtual VBusDownL() = 0;

    void virtual VBusUpL() = 0;

    };

/**

 *  Class observes VBUS property

 *

 *  @lib ?library

 *  @since S60 ?S60_version *** for example, S60 v3.0

 */

class CUsbVBusObserver : public TAssertBase

    {

    friend class CtUsbOtgWatcher;

    friend class CUsbOtgWatcherTest;

public:

    enum TState

        {

        EVBusDown = 0,

        EVBusUp = 1

        };

    /**

     * Two-phased constructor.

     * @param ?arg1 ?description

     * @param ?arg2 ?description

     */

    //    ?IMPORT_C 

    static CUsbVBusObserver* NewL();

    /**

     * Destructor.

     */

    virtual ~CUsbVBusObserver();

    /**

     * ?description

     *

     * @since S60 ?S60_version

     * @param ?arg1 ?description

     * @param ?arg2 ?description

     * @return ?description

     */

    //    ?IMPORT_C 

    TState VBus() /* const! read comment in impl*/;

    /**

     * ?description

     *

     * @since S60 ?S60_version

     * @param ?arg1 ?description

     * @param ?arg2 ?description

     * @return ?description

     */

    void SubscribeL(MUsbVBusObserver&);

    void UnsubscribeL(MUsbVBusObserver&);

    void SetRUsb(RUsb* aRUsb);

    void TriggerVBusUpL();

    void TriggerVBusDownL();

private:

    CUsbVBusObserver();

    void ConstructL();

private:

    // data

    RUsb* iUsb;

    // The observer reports state changes to own observers

    // Own

    MUsbVBusObserver* iObserver;

    };

#endif //  C_USBVBUSOBSERVER_H