/*

* 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:  Observes OTG states

 *

*/

#ifndef C_USBOTGSTATEOBSERVER_H

#define C_USBOTGSTATEOBSERVER_H

#include <e32base.h>

#include <e32property.h>

#include <usbotgdefs.h>

/**

 *  Observer need to implement this interface to get OTG state change notifications

 */

NONSHARABLE_CLASS( MUsbOtgStateObserver)

    {

public:

    /**

     * Local device is A, and get to Idle state

     */

    virtual void AIdleL() = 0;

    /**

     * Local device is A, and get to Host state

     */

    virtual void AHostL() = 0;

    /**

     * Local device is A, and get to Peripheral state

     */

    virtual void APeripheralL() = 0;

    /**

     * Local device is A, and get VBus error

     */

    virtual void AVBusErrorL() = 0;

    /**

     * Local device is B, and get to Idle state

     */

    virtual void BIdleL() = 0;

    /**

     * Local device is B, and get to Peripheral state

     */

    virtual void BPeripheralL() = 0;

    /**

     * Local device is B, and get to Host state

     */

    virtual void BHostL() = 0;

    /**

     * Error handler

     * @param aError error code

     */

    virtual void OtgStateErrorL(TInt aError) = 0;    

    };

/**

 *  Class observes OTG State property

 *

 */

NONSHARABLE_CLASS( CUsbOtgStateObserver ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     */

    static CUsbOtgStateObserver* NewL();

    /**

     * Destructor.

     */

    virtual ~CUsbOtgStateObserver();

    /**

     * Gets current OTG state

     * @return OTG state

     */

    TUsbOtgState OtgState();

    /**

     * Subscribes for getting notifications

     * @param aObserver Observer

     */

    void SubscribeL(MUsbOtgStateObserver* aObserver);

    /**

     * Unsubscribes from getting notifications

     * @param aObserver Observer

     */

    void UnsubscribeL(MUsbOtgStateObserver* aObserver);

private:

    // From CActive

    /**

     * Called when outstanding request completed

     *

     */

    void RunL();

    /**

     * Called when outstanding request is cancelled

     *

     */

    void DoCancel();

    /**

     * Called when RunL leaves

     *

     * @param errorcode

     * @return errorcode

     */

    TInt RunError(TInt aError);

private:

    /**

     * Default constructor

     *

     */

    CUsbOtgStateObserver();

    /**

     * Second phase construction

     *

     */

    void ConstructL();

private:

    // data

    /**

     * The observer reports state changes to own observers

     * Owns

     */

    RPointerArray<MUsbOtgStateObserver> iObservers;

    /**

     * The observer observes property change

     */

    RProperty iOtgState;

    };

#endif //  C_USBOTGSTATEOBSERVER_H