/*

* 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:  Device state watcher class.

 *

*/

// INCLUDE FILES

#include "USBDeviceStateWatcher.h"

// CONSTANTS

const TUint KUsbAllStates = 0xFFFFFFFF;

// --------------------------------------------------------------------------

// Two-phased constructor. Uses existing usb manager session.

// --------------------------------------------------------------------------

CUSBDeviceStateWatcher*

CUSBDeviceStateWatcher::NewL(MUSBDeviceStateObserver& aObserver, RUsb& aUsbMan)

    {

    CUSBDeviceStateWatcher* self = new(ELeave)CUSBDeviceStateWatcher(aObserver);

    CleanupStack::PushL(self);

    self->ConstructL(aUsbMan);

    CleanupStack::Pop(self);

    return self;

    }

// --------------------------------------------------------------------------

// Two-phased constructor. Creates its own usb manager session.

// --------------------------------------------------------------------------

CUSBDeviceStateWatcher*

CUSBDeviceStateWatcher::NewL(MUSBDeviceStateObserver& aObserver)

    {

    CUSBDeviceStateWatcher* self = new(ELeave)CUSBDeviceStateWatcher(aObserver);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;

    }

// --------------------------------------------------------------------------

// C++ constructor

// --------------------------------------------------------------------------

CUSBDeviceStateWatcher::CUSBDeviceStateWatcher(MUSBDeviceStateObserver& aObserver) 

    : CActive(EPriorityStandard), iObserver(aObserver)

    {

    CActiveScheduler::Add(this);

    }

// --------------------------------------------------------------------------

// C++ destructor

// --------------------------------------------------------------------------

CUSBDeviceStateWatcher::~CUSBDeviceStateWatcher()

    {

    Cancel();

    }

// --------------------------------------------------------------------------

// Symbian 2nd phase constructor. Uses existing usb manager session. 

// --------------------------------------------------------------------------

void CUSBDeviceStateWatcher::ConstructL(RUsb& aUsbMan)

    {

    iUsbMan.SetHandleNC(aUsbMan.Handle()); // NC == NoClose

    CommonConstructL();

    }

// --------------------------------------------------------------------------

// Symbian 2nd phase constructor. Creates its own usb manager session. 

// --------------------------------------------------------------------------

void CUSBDeviceStateWatcher::ConstructL()

    {

    User::LeaveIfError(iUsbMan.Connect());

    CommonConstructL();

    }

// --------------------------------------------------------------------------

// Code shared by all ConstructL methods.

// Usb manager session has already been set up.

// --------------------------------------------------------------------------

void CUSBDeviceStateWatcher::CommonConstructL()

    {

    User::LeaveIfError(iUsbMan.GetDeviceState(iCurrentState));

    iPreviousState = iCurrentState;

    iUsbMan.DeviceStateNotification(KUsbAllStates, iCurrentState, iStatus);

    SetActive();

    }

// --------------------------------------------------------------------------

// The device state has changed.

// --------------------------------------------------------------------------

void CUSBDeviceStateWatcher::RunL()

    {

    if (iStatus == KErrNone)

        {

            if (iCurrentState != iPreviousState)

                {

                    iObserver.DeviceStateChanged(iPreviousState, iCurrentState);

                    iPreviousState = iCurrentState;

                }

            iUsbMan.DeviceStateNotification(KUsbAllStates, iCurrentState, iStatus);

            SetActive();

        }

    }

// ----------------------------------------------------------------------------

// Standard active object error function.

// ----------------------------------------------------------------------------

TInt CUSBDeviceStateWatcher::RunError(TInt /*aError*/)

    {

    // Currently no leaving functions called in RunL, thus nothing should cause

    // this to be called -> return.

    return KErrNone;

    }

// ----------------------------------------------------------------------------

// Standard active object cancellation function.

// ----------------------------------------------------------------------------

void CUSBDeviceStateWatcher::DoCancel()

    {

    iUsbMan.DeviceStateNotificationCancel();    

    }