/*+
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* Copyright (c) 2005-2007 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:  Active transaction stack+
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*+
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*/+
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+
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+
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#ifndef C_ACTIVETRANSACTIONSTACK_H+
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#define C_ACTIVETRANSACTIONSTACK_H+
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+
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#include <e32base.h>+
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+
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+
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namespace AiXmlUiController+
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    {+
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    class MTransaction;+
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    class CTransaction;+
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    }+
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+
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+
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namespace AiXmlUiController+
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{+
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+
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/**+
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*  @ingroup group_xmluicontroller+
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* +
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*  CActiveTransactionStack is a stack for CTransactions+
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*+
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*  @lib AiXmlUiMain+
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*/+
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class CActiveTransactionStack : public CBase+
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    {+
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public:  // Constructors and destructor+
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    +
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    static CActiveTransactionStack* NewL();+
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    +
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    virtual ~CActiveTransactionStack();+
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+
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    // New functions+
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    +
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    /**+
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    * Checks if stack is empty.+
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    * @return ETrue if stack is empty+
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    */+
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    TBool IsEmpty() const;+
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    +
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    /**+
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    * Pushes a transaction into the stack.+
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    * @param aTransaction the transaction+
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    */+
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    void Push( MTransaction* aTransaction );+
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    +
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    /**+
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    * Pops the topmost transaction from the stack.+
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    * @return the topmost transaction from the stack+
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    */+
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    MTransaction* Pop();+
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    +
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    /**+
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    * Returns the topmost transaction from the stack.+
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    * @return the topmost transaction from the stack+
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    */+
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    MTransaction* Top() const;+
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    +
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    /**+
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    * Lookups a transaction from the stack.+
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    * @param aTxId the transaction id of the transaction+
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    * @return the transaction with aTxId from the stack+
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    */+
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    MTransaction* Lookup( TInt aTxId ) const;+
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    +
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    /**+
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    * Removes a transaction from the stack.+
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    * @param aTxId the transaction id of the transaction+
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    * @return the transaction with aTxId from the stack+
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    */+
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    MTransaction* Remove( TInt aTxId );+
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    +
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private:+
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+
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    CActiveTransactionStack();+
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    +
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    CTransaction* DoTop() const;+
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    +
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    CTransaction* DoLookup( TInt aTxId ) const;+
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+
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private:    // Data+
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    +
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    /**+
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     * Doubly linked list of transactions+
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     */ +
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    TDblQue< CTransaction > iTransactions;+
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    };+
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    +
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} // namespace AiXmlUiController+
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+
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#endif      // C_ACTIVETRANSACTIONSTACK_H+
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           +
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//  End of File+
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