/*

* Copyright (c) 2007 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_CCHSWIUSBOBSERVER_H

#define C_CCHSWIUSBOBSERVER_H

// INCLUDES

#include <e32std.h>

#include <e32base.h>

#include <f32file.h>

// FORWARD DECLARATION

class CCHSwiUsbHandler;

/*

 * Observes RFs for RawDiskWrite events (these are also triggered when 

 * (un)mounting drive; RFs does not provide better, more specific 

 * notifications for mount and dismount).

 * 

 * After receiving notification, calls 

 * CCHSwiUsbHandler::PostponedDriveScan() and does not subscribe to

 * further notifcations. It is up to the plugin to call

 * CCHSwiUsbObserver::Start() after a successful drive scan.

 *

 * @since 3.1

 */

class CCHSwiUsbObserver : public CActive

    {

public:

	/**

	 * Two-phased constructor.

     * @param aFs File session. 

	 */

    static CCHSwiUsbObserver* NewL( CCHSwiUsbHandler* aHandler, RFs& aFs );

	/**

	 * Destructor.

	 */

    virtual ~CCHSwiUsbObserver();

    /**

     * Active object start.

     */

    void Start();

protected:

	/**

	 * Handle RFs notifications.

	 */

    void RunL();

    /**

     * RunL error handling.

     * @param aError Error.

     */

    TInt RunError( TInt aError );

    /**

     * Cancels notifications.

     */

    void DoCancel();

private:

    /**

     * no copy constructor

     */

    CCHSwiUsbObserver( const CCHSwiUsbObserver& );

    /**

     * no assignment

     */    

    CCHSwiUsbObserver& operator=( const CCHSwiUsbObserver& );

    /**

     * C++ default constructor

     */

    CCHSwiUsbObserver( CCHSwiUsbHandler* aHandler, RFs& aFs );

    /**

     * Symbian default constructor.

     */

    void ConstructL();

private:

	/**

	 * File Session.

	 */

    RFs iFs;

    /**

     * Usb handler to perform postponed checks for mass storage mode.

     */

    CCHSwiUsbHandler* iUsbHandler;

    };

#endif // #ifndef C_CCHSWIUSBOBSERVER_H