/*

* Copyright (c) 2006-2007 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:  DUN USB plugin's listener

*

*/

#ifndef C_CDUNUSBLISTEN_H

#define C_CDUNUSBLISTEN_H

#include <e32std.h>

#include <c32comm.h>

#include <usbman.h>

#include "DunPlugin.h"

enum TUsbListenState

    {

    EUsbListenStateIdle,

    EUsbListenStateListening

    };

/**

 *  DUN USB plugin's listener class

 *  This class starts listening for USB device state to change to configured.

 *  When change to configured is detected, parent (CDunUsbPlugin) is notified

 *  to create a channel. Also when device state is no longer configured,

 *  parent (CDunUsbPlugin) is notified to remove a channel.

 *

 *  @lib dunusb.lib

 *  @since S60 v3.2

 */

NONSHARABLE_CLASS( CDunUsbListen ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aServer Server

     * @param aParent Creator of this instance

     * @param aUsbServer USB server

     * @return Instance of self

     */

    static CDunUsbListen* NewL( MDunServerCallback* aServer,

                                MDunListenCallback* aParent,

                                RUsb& aUsbServer );

    /**

    * Destructor.

    */

    virtual ~CDunUsbListen();

    /**

     * Resets data to initial values

     *

     * @since S60 3.2

     * @return None

     */

    void ResetData();

    /**

     * IssueRequest to USB server for device state change notifications

     *

     * @return KErrAlreadyExists if device state configured,

     *         KErrNone otherwise

     */

    TInt IssueRequestL();

    /**

     * Stops listening

     *

     * @since S60 3.2

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt Stop();

private:

    CDunUsbListen( MDunServerCallback* aServer,

                   MDunListenCallback* aParent,

                   RUsb& aUsbServer );

    void ConstructL();

    /**

     * Initializes this class

     *

     * @since S60 3.2

     * @return None

     */

    void Initialize();

    /**

     * Activates listening request

     *

     * @since S60 3.2

     * @return KErrNotReady if already active, KErrNone otherwise

     */

    TInt Activate();

// from base class CActive

    /**

     * From CActive.

     * Called when read or write operation is ready.

     *

     * @since S60 3.2

     * @return None

     */

    void RunL();

    /**

     * From CActive.

     * Cancel current activity.

     *

     * @return None

     */

    void DoCancel();

private:  // data

    /**

     * Callback to call when notification via MDunServerCallback to be made

     * Not own.

     */

    MDunServerCallback* iServer;

    /**

     * Callback to call when notification via MDunListenCallback to be made

     * Not own.

     */

    MDunListenCallback* iParent;

    /**

     * Current state of listening: active or inactive

     */

    TUsbListenState iListenState;

    /**

     * USB server (USB manager) needed for device state notifications

     * Device states needed to create transporter channel

     */

    RUsb& iUsbServer;

    /**

     * Device state of USB set when RUsb::DeviceStateNotification completes

     */

    TUsbDeviceState iDeviceState;

    /**

     * Previous state of USB set when RUsb::DeviceStateNotification completes

     */

    TUsbDeviceState iDeviceStatePrev;

    };

#endif  // C_CDUNUSBLISTEN_H