1 /*

     2 * Copyright (c) 2005-2007 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Active transaction stack

    15 *

    16 */

    17 

    18 

    19 #include    "activetransactionstack.h"

    20 #include    "transaction.h"

    21 #include    "xmluicontrollerpanic.h"

    22 

    23 

    24 

    25 using namespace AiXmlUiController;

    26 

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

    28 

    29 CActiveTransactionStack::CActiveTransactionStack()

    30     : iTransactions( CTransaction::LinkOffset() )

    31     {

    32     }

    33 

    34 CActiveTransactionStack* CActiveTransactionStack::NewL()

    35     {

    36     CActiveTransactionStack* self = new( ELeave ) CActiveTransactionStack;

    37     

    38     return self;

    39     }

    40     

    41 CActiveTransactionStack::~CActiveTransactionStack()

    42     {

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

    44     }

    45 

    46 TBool CActiveTransactionStack::IsEmpty() const

    47     {

    48     return iTransactions.IsEmpty();

    49     }

    50             

    51 void CActiveTransactionStack::Push( MTransaction* aTransaction )

    52     {

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

    54     

    55     if ( tr )

    56         {

    57         iTransactions.AddFirst( *tr );

    58         }

    59     }

    60 

    61 MTransaction* CActiveTransactionStack::Pop()

    62     {

    63     CTransaction* tr = DoTop();

    64     if ( tr )

    65         {

    66         tr->Deque();

    67         }

    68         

    69     return tr;

    70     }

    71     

    72 MTransaction* CActiveTransactionStack::Top() const

    73     {

    74     return DoTop();

    75     }

    76             

    77 MTransaction* CActiveTransactionStack::Lookup( TInt aTxId ) const

    78     {

    79     return DoLookup( aTxId );

    80     }

    81             

    82 MTransaction* CActiveTransactionStack::Remove( TInt aTxId )

    83     {

    84     CTransaction* tr = DoLookup( aTxId );

    85     

    86     if ( tr )

    87         {

    88         tr->Deque();

    89         }

    90     

    91     return tr;

    92     }

    93 

    94 CTransaction* CActiveTransactionStack::DoTop() const

    95     {

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

    97 

    98     CTransaction* tr = iTransactions.First();

    99     return tr;

   100     }

   101 

   102 CTransaction* CActiveTransactionStack::DoLookup( TInt aTxId ) const

   103     {

   104     // Iterate over transactions and search transaction with aTxId

   105     TDblQueIter< CTransaction >

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

   107     iter.SetToFirst();

   108     

   109     while ( iter )

   110         {

   111         CTransaction* tr = iter++;

   112         

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

   114             {

   115             // Match. Return transaction 

   116             return tr;

   117             }        

   118         }

   119         

   120     return NULL;

   121     }

   122     

   123 //  End of File