// Copyright (c) 2006-2009 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:

//

// INCLUDE FILES

#include "HWRMtrace.h"

#include "HWRMPluginTransactionList.h"

// EXTERNAL DATA STRUCTURES

// None

// EXTERNAL FUNCTION PROTOTYPES  

// None

// CONSTANTS

// None

// MACROS

// None

// LOCAL CONSTANTS AND MACROS

// None

// MODULE DATA STRUCTURES

// None

// LOCAL FUNCTION PROTOTYPES

// None

// FORWARD DECLARATIONS

// None

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

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

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

// CHWRMPluginTransactionList::CHWRMPluginTransactionList

// C++ constructor

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

//

CHWRMPluginTransactionList::CHWRMPluginTransactionList()

    : iTransactionData(NULL),

    iTransactionDataLast(NULL)

    {

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::CHWRMPluginTransactionList()" ));

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::CHWRMPluginTransactionList - return " ));

    }

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

// CHWRMPluginTransactionList::NewL

// Two-phased constructor.

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

// 

CHWRMPluginTransactionList* CHWRMPluginTransactionList::NewL()

    {

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::NewL()" ));

    CHWRMPluginTransactionList* self = new( ELeave ) CHWRMPluginTransactionList();

    // No ConstructL as nothing to do there.

    COMPONENT_TRACE2(_L( "HWRM Server - CHWRMPluginTransactionList::NewL - return 0x%x" ), self );

    return self;

    }

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

// Destructor

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

//

CHWRMPluginTransactionList::~CHWRMPluginTransactionList()

    {

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::~CHWRMPluginTransactionList()" ) );

    // delete any existing transaction data

    while ( iTransactionData )

        {

        COMPONENT_TRACE2(_L( "HWRM Server - CHWRMPluginTransactionList::~CHWRMPluginTransactionList - Deleting transaction %d" ), iTransactionData->iTransId );

        THWRMPluginTransactionListItem* data = iTransactionData;

        iTransactionData = iTransactionData->iNextData;

        delete data;

        }

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

    iTransactionDataLast = NULL;    

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::~CHWRMPluginTransactionList - return " ));

    }

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

// CHWRMPluginTransactionList::FindTransaction

// Find transaction from list.

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

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

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

//

THWRMPluginTransactionListItem* CHWRMPluginTransactionList::FindTransaction( TUint8 aTransId, TBool aRemove )

    {

    COMPONENT_TRACE3(_L( "HWRM Server - CHWRMPluginTransactionList::FindTransaction(0x%x, 0x%x)" ), aTransId, aRemove );

#ifdef COMPONENT_TRACE_FLAG

    // check the transaction list contents

    THWRMPluginTransactionListItem* checkData = iTransactionData;

    TInt count(0);

    if ( checkData )

        {

        while ( checkData )

            {        

            COMPONENT_TRACE3(_L( "HWRM Server - CHWRMPluginTransactionList::FindTransaction - Data %d in list: 0x%x" ), count, checkData->iTransId );

            count++;

            checkData = checkData->iNextData;

            }

        }

    else

        {

        COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::FindTransaction - List is empty" ) );        

        }

#endif

    THWRMPluginTransactionListItem* data = iTransactionData;

    // comment to ignore Coverity false positive. See more detailed comment below.

    // coverity[assign_zero]

    THWRMPluginTransactionListItem* dataPrevious = NULL;

    TBool found(EFalse);

    while ( data && !found )

        {

        if ( data->iTransId == aTransId )

            {

            found = ETrue;

            // update pointers, if remove

            if ( aRemove )

                {                

                if ( iTransactionData == data )

                    {

                    iTransactionData = data->iNextData;

                    }

                else

                    {

                    // dataPrevious is always not NULL here.

                    // If the while loop IS on its first iteration iTransactionData == data 

                    // is true since data = iTransactionData is how data is initiated. If this is 

                    // NOT the first iteration dataPrevious = data in the else claues below will 

                    // have made sure dataPrevious != NULL. Comments to instruct Coverity to ignore

                    // this false positive are justified.

                    //

                    //coverity[var_deref_op]

                    dataPrevious->iNextData = data->iNextData;

                    }

                if ( iTransactionDataLast == data )

                    {

                    iTransactionDataLast = dataPrevious;

                    }

                iCount--;

                }

            }

        else

            {

            dataPrevious = data;

            data = data->iNextData;

            }

        }

#ifdef COMPONENT_TRACE_FLAG

    if ( data )

        {

        COMPONENT_TRACE2(_L( "HWRM Server - CHWRMPluginTransactionList::FindTransaction - return transaction 0x%x" ), data->iTransId );

        }

    else

        {

        COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::FindTransaction - return NULL" ) );

        }

#endif

    return data;

    }

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

// CHWRMPluginTransactionList::AddTransaction

// Adds transaction to list

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

//

void CHWRMPluginTransactionList::AddTransaction( THWRMPluginTransactionListItem* aTransactionData )    

    {

    COMPONENT_TRACE2(_L( "HWRM Server - CHWRMPluginTransactionList::AddTransaction(0x%x)" ), aTransactionData );

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

    if ( iTransactionData )

        {

        iTransactionDataLast->iNextData = aTransactionData;

        COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::AddTransaction - Added transaction to list" ) ); 

        }

    else

        {

        iTransactionData = aTransactionData;

        }

    iTransactionDataLast = aTransactionData;   

    iTransactionDataLast->iNextData = NULL;       

    iCount++;

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::AddTransaction - return" ) );

    }

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

// CHWRMPluginTransactionList::RemoveFirstItem

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

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

//

THWRMPluginTransactionListItem* CHWRMPluginTransactionList::RemoveFirstItem()    

    {

    COMPONENT_TRACE1(_L( "HWRM Server - CHWRMPluginTransactionList::RemoveFirstItem()" ) );

    THWRMPluginTransactionListItem* retval = iTransactionData;

    iTransactionData = iTransactionData->iNextData;

    iCount--;

    COMPONENT_TRACE2(_L( "HWRM Server - CHWRMPluginTransactionList::RemoveFirstItem - return 0x%x" ), retval );

    return retval;

    }

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

//  End of File