/*

* Copyright (c) 2002-2005 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:   Observer of ECOM events. 

*

*/

#include "epos_comasuplecomeventwatcher.h"

// ================= MEMBER FUNCTIONS =======================

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

// Two phased constructor.

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

//

COMASuplEcomEventWatcher* COMASuplEcomEventWatcher::NewL(MSuplEcomEventObserver& aSuplEcomEventObserver, TUid aInterfaceUid, TUid aImplId)

	{

	COMASuplEcomEventWatcher* self = new(ELeave) COMASuplEcomEventWatcher(aSuplEcomEventObserver, aInterfaceUid, aImplId);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop();

	return self;

	}

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

// Constructor.

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

//

COMASuplEcomEventWatcher::COMASuplEcomEventWatcher(MSuplEcomEventObserver& aSuplEcomEventObserver, TUid aInterfaceUid, TUid aImplId)

 : CActive(EPriorityStandard),

   iSuplEcomEventObserver(aSuplEcomEventObserver),

   iPlugInInterfaceUid(aInterfaceUid),

   iPlugInImplUid(aImplId),

   iSuplEcomPlugInStatus(ENotExist)

	{

	CActiveScheduler::Add(this);

	}

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

// ConstructL.

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

//

void COMASuplEcomEventWatcher::ConstructL()

	{

	REComSession& ecomSession = REComSession::OpenL();

	iEComSession = &ecomSession;

	TBool isImplPresent = IsImplementationExistL();	

	if(isImplPresent == EFalse)

		{

		User::Leave(KErrNotFound);

		}

	iSuplEcomPlugInStatus = EExist ;

	}

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

// Destructor.

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

//

COMASuplEcomEventWatcher::~COMASuplEcomEventWatcher()

	{

	Cancel();

	if(iEComSession)

	iEComSession->Close();

	}

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

// Implementation of RunL.

// RunL() calls observer method if there is any uninstallation in

// already instantiated handler plug-in.

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

//

void COMASuplEcomEventWatcher::RunL()

	{

	// check plug-in unload

	TBool isImplPresent = IsImplementationExistL();	

	if(isImplPresent == EFalse)	

		{

		if(iSuplEcomPlugInStatus == EExist)

			{

			iSuplEcomPlugInStatus = ENotExist ;

			// here to inform observer

			iSuplEcomEventObserver.PlugInUninstalled();	

			}

		}	

	// request ecom framework for notification

	iEComSession->NotifyOnChange(iStatus);

	SetActive();	

	}

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

// RunError.

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

//

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

	{

	return KErrNone;	

	}

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

// DoCancel.

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

//

void COMASuplEcomEventWatcher::DoCancel()

	{

	// cancel request for ecom notification

	iEComSession->CancelNotifyOnChange(iStatus);

	}

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

// IsImplementationExist.

// This method checks the existance of specific plug-in and returns result accordingly.

// (other items were commented in a header).

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

//

TBool COMASuplEcomEventWatcher::IsImplementationExistL()

	{

	TBool retVal = EFalse;

    RImplInfoPtrArray implInfoArray;

	REComSession::ListImplementationsL(iPlugInInterfaceUid, implInfoArray);

	TInt implementationCount = implInfoArray.Count();

	for(TInt loop=0; loop < implementationCount; loop++)

		{

		if(implInfoArray[loop]->ImplementationUid() == iPlugInImplUid)

			{

			retVal = ETrue;

			break;

			}

		}

	implInfoArray.ResetAndDestroy();

    return retVal;

	}

// NotifyOnPlugInUnInstallation

void COMASuplEcomEventWatcher::NotifyOnPlugInUnInstallation()

	{

	// request ecom framework for notification

	iEComSession->NotifyOnChange(iStatus);

	SetActive();		

	}

// end of file