/*

* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

// INCLUDE FILES

#include    "dpdef.h"                   // dataport definitions

#include    "dpobserver.h"              // abstract observer class

#include    "dplog.h"                   // dataport logging

#ifdef OST_TRACE_COMPILER_IN_USE

#endif

// EXTERNAL DATA STRUCTURES

// none

// EXTERNAL FUNCTION PROTOTYPES

// none

// CONSTANTS

const TInt CDpObserver::iOffset = _FOFF(CDpObserver,iSlink);

// MACROS

// none

// LOCAL CONSTANTS AND MACROS

// none

// MODULE DATA STRUCTURES

// none

// LOCAL FUNCTION PROTOTYPES

// none

// FORWARD DECLARATIONS

// none

// ============================= LOCAL FUNCTIONS ===============================

// none

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

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

// CDpObserver::CDpObserver

// C++ default constructor.

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

CDpObserver::CDpObserver()

    {

    OstTrace0( TRACE_NORMAL, CDPOBSERVER_CDPOBSERVER, "CDpObserver::CDpObserver" );

    }

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

// CDpObserver::~CDpObserver

// Destructor

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

CDpObserver::~CDpObserver()

    {

    OstTrace0( TRACE_NORMAL, DUP1_CDPOBSERVER_CDPOBSERVER, "CDpObserver::~CDpObserver" );

    iSlink.iNext = NULL;

    }

//=============================================================================

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

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

// CDpSubject::CDpSubject

// C++ default constructor.

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

CDpSubject::CDpSubject() :

    iObserverList( CDpObserver::iOffset ),

    iObserverIter( iObserverList )

    {

    OstTrace0( TRACE_NORMAL, CDPSUBJECT_CDPSUBJECT, "CDpSubject::CDpSubject" );

    LOGM(" CDpSubject::CDpSubject");

    }

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

// CDpSubject::~CDpSubject

// Destructor

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

CDpSubject::~CDpSubject()

    {

    OstTrace0( TRACE_NORMAL, DUP1_CDPSUBJECT_CDPSUBJECT, "CDpSubject::~CDpSubject" );

    LOGM(" CDpSubject::~CDpSubject");

    CDpObserver* item= NULL;

    // set observer to first item in the list

    iObserverIter.SetToFirst();

    while( NULL != (item = iObserverIter++) )

        {

        iObserverList.Remove( *item );

        }

    }

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

// CDpSubject::Attach

// Attach observer to this subject

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

//

void CDpSubject::Attach(

    CDpObserver& aObserver)

    {

    OstTrace0( TRACE_NORMAL, CDPSUBJECT_ATTACH, "CDpSubject::Attach" );

    LOGM(" CDpSubject::Attach");

    iObserverList.AddLast( aObserver );

    }

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

// CDpSubject::Detach

// Detach observer from this subject

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

//

void CDpSubject::Detach(

    CDpObserver& aObserver)

    {

    OstTrace0( TRACE_NORMAL, CDPSUBJECT_DETACH, "CDpSubject::Detach" );

    LOGM(" CDpSubject::Detach");

    iObserverList.Remove( aObserver );

    }

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

// CDpSubject::Notify

// Notify all observers of this subject object

// i.e. call UpDate() in every observer object.

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

//

void CDpSubject::Notify()

    {

    OstTrace0( TRACE_NORMAL, CDPSUBJECT_NOTIFY, "CDpSubject::Notify" );

    LOGM(" CDpSubject::Notify");

    CDpObserver* item = NULL;

    iObserverIter.SetToFirst();

    while( NULL != (item = iObserverIter++) )

        {

        item->UpDate( this );

        }

    }

// ================= OTHER EXPORTED FUNCTIONS ==============

// none

//  End of File