/*

 * 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:  Implementation 

 *

 */

#ifndef C_USBSERVICECONTROL_H

#define C_USBSERVICECONTROL_H

#include <e32base.h>

class RUsb;

/**

 *  usb service control observer interface, to get feedback on usb service state change

 *

 */

NONSHARABLE_CLASS( MUsbServiceControlObserver)

    {

public:

    /**

     * called when request for usb services is completed

     * if there were few requests in a row, during operation, 

     * only the last one's completion is notified

     * @param aError error code

     */

    virtual void UsbServiceControlReqCompletedL(TInt aError) = 0;

    };

/**

 *  This class implements starting/stopping usb services 

 *

 */

NONSHARABLE_CLASS( CUsbServiceControl ) : public CActive

    {

public:

    enum TUsbServiceRequest

        {

        ERequestUndefined,

        EStartUsbService,

        EStopUsbService

        };

    /**

     * Two-phased constructor.

     * @param aObserver Observer

     * @param aUsb RUsb API

     */

    static CUsbServiceControl* NewL(MUsbServiceControlObserver& aObserver,

            RUsb& aUsb);

    /**

     * Destructor.

     */

    virtual ~CUsbServiceControl();

    /**

     * Starts usb service. When service is started call back function 

     * MUsbServiceControlObserver::UsbServiceControlReqCompletedL will be called.

     * Client should not worry is usb service already started, or not,

     * and which one personality is started. Just request this API 

     * @param aPersonalityId personality id (required by RUsb API to start usb services) 

     * @return error code

     */

    TInt StartL(TInt aPersonalityId);

    /**

     * Stops service. When service is stopped call back function 

     * MUsbServiceControlObserver::UsbServiceControlReqCompletedL will be called

     * @return error code

     */

    TInt StopL();

public:

    // from base class CActive

    /**

     * Called when request is completed

     */

    void RunL();

    /**

     * called when RunL leaves

     * @param aError error code

     * @return error code

     */

    TInt RunError(TInt aError);

    /**

     * Called when request is cancelled

     */

    void DoCancel();

private:

    /**

     * Default constructor

     * @param aObserver receives call back when service started or stopped

     * @param aUsb usbman API

     */

    CUsbServiceControl(MUsbServiceControlObserver& aObserver, RUsb& aUsb);

    /**

     * 2nd phase construction

     */

    void ConstructL();

private:

    /**

     * Observer

     * not own

     */

    MUsbServiceControlObserver& iObserver;

    /**

     * RUsb API

     */

    RUsb& iUsb;

    /**

     * personality ID, to be started

     */

    TInt iPersonalityId;

    /**

     * Service state

     */

    TUsbServiceState iServiceState; // required as a parameter for service states notifications 

    };

#endif //  C_USBSTATEHOSTAHANDLE_H