/*

* 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:  Haptics server plugin handler implementation

*

*/

#include "hwrmhapticstrace.h"

#include "hwrmhapticsplugintransactionlist.h"

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

// C++ constructor

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

//

CHWRMHapticsPluginTransactionList::CHWRMHapticsPluginTransactionList()

    {

    }

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

// Destructor

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

//

CHWRMHapticsPluginTransactionList::~CHWRMHapticsPluginTransactionList()

    {

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::~CHWRMHapticsPluginTransactionList()" ) ) );

    // delete any existing transaction data

    while ( iTransactionData )

        {

        COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::~CHWRMHapticsPluginTransactionList - Deleting transaction %d" ), iTransactionData->TransactionId() ) );

        CHWRMHapticsPluginTransactionListItem* data = iTransactionData;

        iTransactionData = iTransactionData->NextItem();

        delete data;

        }

    // No need to delete iTransactionDataLast, obviously. Just NULL it to 

    iTransactionDataLast = NULL;    

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::~CHWRMHapticsPluginTransactionList - return " ) ) );

    }

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

// Find transaction from list.

// Uses linear search, but there should rarely be more than one concurrent

// transaction so it won't be a problem.

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

//

CHWRMHapticsPluginTransactionListItem* 

CHWRMHapticsPluginTransactionList::FindTransaction( TUint8 aTransId, 

                                                    TBool aRemove )

    {

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::FindTransaction(0x%x, 0x%x)" ), aTransId, aRemove ) );

    CHWRMHapticsPluginTransactionListItem* data = iTransactionData;

    CHWRMHapticsPluginTransactionListItem* dataPrevious = NULL;

    TBool found( EFalse );

    while ( data && !found )

        {

        if ( data->TransactionId() == aTransId )

            {

            found = ETrue;

            // update pointers, if remove

            if ( aRemove )

                {                

                if ( iTransactionData == data )

                    {

                    iTransactionData = data->NextItem();

                    }

                else

                    {

                    // dataPrevious is always not NULL here, since first item

                    // in the list will use the other branch of this if.

                    dataPrevious->SetNextItem( data->NextItem() );

                    }

                if ( iTransactionDataLast == data )

                    {

                    iTransactionDataLast = dataPrevious;

                    }

                iCount--;

                }

            }

        else

            {

            dataPrevious = data;

            data = data->NextItem();

            }

        }

    return data;

    }

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

// Adds transaction to list

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

//

void CHWRMHapticsPluginTransactionList::AddTransaction( 

    CHWRMHapticsPluginTransactionListItem* aTransactionData )    

    {

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::AddTransaction(0x%x)" ), aTransactionData ) );

    // if previous data exists, put it last in the list.

    if ( iTransactionData )

        {

        iTransactionDataLast->SetNextItem( aTransactionData );

        COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::AddTransaction - Added transaction to list" ) ) ); 

        }

    else

        {

        iTransactionData = aTransactionData;

        }

    iTransactionDataLast = aTransactionData;   

    iTransactionDataLast->SetNextItem( NULL );

    iCount++;

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::AddTransaction - return" ) ) );

    }

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

// Removes first item from transaction list and adjust pointers accordingly

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

//

CHWRMHapticsPluginTransactionListItem* 

CHWRMHapticsPluginTransactionList::RemoveFirstItem()

    {

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::RemoveFirstItem()" ) ) );

    CHWRMHapticsPluginTransactionListItem* retval = iTransactionData;

    iTransactionData = iTransactionData->NextItem();

    iCount--;

    COMPONENT_TRACE( ( _L( "CHWRMHapticsPluginTransactionList::RemoveFirstItem - return 0x%x" ), retval ) );

    return retval;

    }

//  End of File