/*

 * 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:  Monitors host events

 *

 */

#ifndef C_USBHOSTEVENTNOTIFICATIONOBSERVER_H

#define C_USBHOSTEVENTNOTIFICATIONOBSERVER_H

#include <e32base.h>

#include <e32property.h>

#include <usbotgdefs.h>

#include <usbhostdefs.h>

class RUsb;

/**

 *  Observer must implement this interface to get notifications

 *

 */

NONSHARABLE_CLASS( MUsbHostEventNotificationObserver)

    {

public:

    /**

     *  Called when device is attached

     *  @param aInfo additional information

     */

    virtual void DeviceAttachedL(TDeviceEventInformation aInfo) = 0;

    /**

     *  Called when device is detached

     *  @param aInfo additional information

     */

    virtual void DeviceDetachedL(TDeviceEventInformation aInfo) = 0;

    /**

     *  Called when drivers are loaded

     *  @param aInfo additional information

     */

    virtual void DriverLoadSuccessL(TDeviceEventInformation aInfo) = 0;

    /**

     *  Called when drivers are loaded partially

     *  @param aInfo additional information

     */

    virtual void DriverLoadPartialSuccessL(TDeviceEventInformation aInfo) = 0;

    /**

     *  Called when drivers loading failed

     *  @param aInfo additional information

     */

    virtual void DriverLoadFailureL(TDeviceEventInformation aInfo) = 0;

    /**

     *  Called when error happens while observing

     *  @param aError error code

     */

    virtual void HostEventNotificationErrorL(TInt aError) = 0;

    };

/**

 *  Class observes USB Notifications

 */

NONSHARABLE_CLASS( CUsbHostEventNotificationObserver ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aUsb usbman

     * @return this class instance

     */

    static CUsbHostEventNotificationObserver* NewL(RUsb* aUsb);

    /**

     * Destructor.

     */

    virtual ~CUsbHostEventNotificationObserver();

    /**

     * Add observer to list of observers

     * @param aObserver observer

     */

    void SubscribeL(MUsbHostEventNotificationObserver& aObserver);

    /**

     * Removes observer from list of observers 

     * @param aObserver Observer

     */

    void UnsubscribeL(MUsbHostEventNotificationObserver& aObserver);

private:

    // From CActive

    /**

     * Called when request completed

     */

    void RunL();

    /**

     * Called when outstanding request cancelled

     */

    void DoCancel();

    /**

     * Called when RunL leaves

     * @param aError errorcode from RunL

     * @return aError errorcode

     */

    TInt RunError(TInt aError);

private:

    /**

     * Default constructor.

     * @param aUsb usbman

     */

    CUsbHostEventNotificationObserver(RUsb* aUsb);

    /**

     * 2nd phase constructor.

     */

    void ConstructL();

private:

    // data

    /**

     * The observer reports changes to own observers

     * Not owns

     */

    RPointerArray<MUsbHostEventNotificationObserver> iObservers;

    /**

     * Notifications come from USB

     * Not own

     */

    RUsb* iUsb;

    /**

     * Info from notification comes to this member

     */

    TDeviceEventInformation iEventInfo;

    };

#endif //  C_USBHOSTEVENTNOTIFICATIONOBSERVER_H