/*

* Copyright (c) 2004 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:  Generic observer array.

*

*/

// INCLUDE FILES

#include <E32std.h>

#include "RGenericObserverArrayBase.h"

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

// C++ default constructor can NOT contain any code, that

// might leave.

//

RGenericObserverArrayBase::RGenericObserverArrayBase()

        : iNotifyLoopRunning( EFalse )

    {

    }

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

// RGenericObserverArrayBase::Close()

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

//

void RGenericObserverArrayBase::Close()

    {

    RPointerArrayBase::Close();

    }

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

// RGenericObserverArrayBase::AddObserver()

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

//

TInt RGenericObserverArrayBase::AddObserver( const TAny* aObserver )

    {

    if ( !aObserver )

        {

        return KErrArgument;

        }

    return RPointerArrayBase::Append( aObserver );

    }

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

// RGenericObserverArrayBase::RemoveObserver()

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

//

TInt RGenericObserverArrayBase::RemoveObserver( const TAny* aObserver )

    {

    const TInt obsCount = RPointerArrayBase::Count();

    for ( TInt ii( 0 ); ii < obsCount; ii++ )

        {

        if ( At( ii ) == aObserver )

            {

            //remove / blank the first found and return

            if ( iNotifyLoopRunning )

                {

                RPointerArrayBase::At( ii ) = NULL;

                }

            else

                {

                RPointerArrayBase::Remove( ii );

                }

            return KErrNone;

            }

        }

    return KErrNotFound;

    }

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

// RGenericObserverArrayBase::Count()

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

//

TInt RGenericObserverArrayBase::Count()

    {

    return RPointerArrayBase::Count();

    }

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

// RGenericObserverArrayBase::NotifyObservers()

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

//

void RGenericObserverArrayBase::NotifyObservers( MGenObserverNotifyMediatorBase& aNotifyMediator,

                                                 TAny* aNotifyData )

    {

    //Protect the observer handling against the observer

    //remove / adding during the notify run.

    iNotifyLoopRunning = ETrue;

    //Observers might be added during notify loop

    //==> use dynamic count

    TInt ii;

    for ( ii = 0; ii < Count(); ii++ )

        {

        TAny* obs = RPointerArrayBase::At( ii );

        if ( obs )

            {

            //observer exist, notify it

            TRAPD( err, aNotifyMediator.MediateNotifyL( obs, aNotifyData ) );

            if ( ( err != KErrNone ) && RPointerArrayBase::At( ii ) )

                {

                //handle notify caused an error and the observer is still there

                //==>report a error to it

                aNotifyMediator.MediateNotifyError( obs, err );

                }

            }

        }

    FinalizeObsArrayAfterNotifyLoop();

    iNotifyLoopRunning = EFalse;

    }

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

// RGenericObserverArrayBase::NotifyObserversFromError()

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

//

void RGenericObserverArrayBase::NotifyObserversFromError(

    MGenObserverNotifyMediatorBase& aNotifyMediator,

    TInt aError )

    {

    //Protect the observer handling against the observer

    //remove / adding during the notify run.

    iNotifyLoopRunning = ETrue;

    //Observers might be added during notify loop

    //==> use dynamic count

    TInt ii;

    for ( ii = 0; ii < Count(); ii++ )

        {

        TAny* obs = RPointerArrayBase::At( ii );

        if ( obs )

            {

            //observer exist, notify it

            aNotifyMediator.MediateError( obs, aError );

            }

        }

    FinalizeObsArrayAfterNotifyLoop();

    iNotifyLoopRunning = EFalse;

    }

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

// RGenericObserverArrayBase::FinalizeObsArrayAfterNotifyLoop()

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

//

void RGenericObserverArrayBase::FinalizeObsArrayAfterNotifyLoop()

    {

    //finalize the array

    for ( TInt ii = ( RPointerArrayBase::Count() - 1 ); ii >= 0; ii-- )

        {

        if ( !RPointerArrayBase::At( ii ) )

            {

            RPointerArrayBase::Remove( ii );

            }

        }

    }

//  End of File