/*

* Copyright (c) 2005-2007 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:  Active transaction stack

*

*/

#include    "activetransactionstack.h"

#include    "transaction.h"

#include    "xmluicontrollerpanic.h"

using namespace AiXmlUiController;

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

CActiveTransactionStack::CActiveTransactionStack()

    : iTransactions( CTransaction::LinkOffset() )

    {

    }

CActiveTransactionStack* CActiveTransactionStack::NewL()

    {

    CActiveTransactionStack* self = new( ELeave ) CActiveTransactionStack;

    return self;

    }

CActiveTransactionStack::~CActiveTransactionStack()

    {

    __ASSERT_DEBUG( IsEmpty(), Panic( ETransactionStackNotEmpty ) );

    }

TBool CActiveTransactionStack::IsEmpty() const

    {

    return iTransactions.IsEmpty();

    }

void CActiveTransactionStack::Push( MTransaction* aTransaction )

    {

    CTransaction* tr = dynamic_cast< CTransaction* >( aTransaction );

    if ( tr )

        {

        iTransactions.AddFirst( *tr );

        }

    }

MTransaction* CActiveTransactionStack::Pop()

    {

    CTransaction* tr = DoTop();

    if ( tr )

        {

        tr->Deque();

        }

    return tr;

    }

MTransaction* CActiveTransactionStack::Top() const

    {

    return DoTop();

    }

MTransaction* CActiveTransactionStack::Lookup( TInt aTxId ) const

    {

    return DoLookup( aTxId );

    }

MTransaction* CActiveTransactionStack::Remove( TInt aTxId )

    {

    CTransaction* tr = DoLookup( aTxId );

    if ( tr )

        {

        tr->Deque();

        }

    return tr;

    }

CTransaction* CActiveTransactionStack::DoTop() const

    {

    __ASSERT_ALWAYS( !iTransactions.IsEmpty(), Panic( ETransactionStackEmpty ) );

    CTransaction* tr = iTransactions.First();

    return tr;

    }

CTransaction* CActiveTransactionStack::DoLookup( TInt aTxId ) const

    {

    // Iterate over transactions and search transaction with aTxId

    TDblQueIter< CTransaction >

        iter( const_cast< TDblQue< CTransaction >& >( iTransactions ) );

    iter.SetToFirst();

    while ( iter )

        {

        CTransaction* tr = iter++;

        if ( tr->Id() == aTxId )

            {

            // Match. Return transaction 

            return tr;

            }        

        }

    return NULL;

    }

//  End of File