/*

* Copyright (c) 2004 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:  Observer interface to listen attribute transaction completion.

*

*/

#ifndef __MPENGATTRIBUTETRANSACTIONOBSERVER2_H

#define __MPENGATTRIBUTETRANSACTIONOBSERVER2_H

//  INCLUDES

#include <E32Std.h>

// FORWARD DECLARATIONS

class CPEngAttributeTransaction2;

class MPEngTransactionStatus2;

// CLASS DECLARATION

/**

 * Observer interface to receive presence attribute

 * transaction completion events.

 *

 * @since 3.0

 */

class MPEngAttributeTransactionObserver2

    {

    public: //Observer methods

        /**

         * Transaction complete handler.

         *

         * Called by CPEngAttributeTransaction2 to handle attribute

         * transaction complete. If this method leaves, error code is

         * reported back to HandleAttributeTransactionError().

         *

         * @since 3.0

         * @param aStatus Transaction status container holding result from

         *        transaction. Container ownership remains on the notfier.

         * @param aTransaction The transaction object where notification

         *        is coming from. No ownership transferred.

         * @param aTransactionOperation ID of the completed transaction.

         *        Transaction operation IDs are listed in

         *        PEngPresenceEngineConsts2.h TPEngTransactionOperation

         *        enumeration. Client can use transaction ID to figure

         *        out what operation completed.

         */

        virtual void HandleAttributeTransactionCompleteL(

            MPEngTransactionStatus2& aStatus,

            CPEngAttributeTransaction2& aTransaction,

            TInt aTransactionOperation ) = 0;

        /**

         * Failure handler.

         *

         * Called to handle leave errors from

         * HandleAttributeTransactionCompleteL().

         *

         * @since 3.0

         * @param aError The leave error from transaction complete handling.

         * @param aTransaction The transaction object which event

         *        handling failed.

         * @param aTransactionOperation ID of the transaction operation.

         *        which event handling failed. Transaction operation

         *        IDs are listed in PEngPresenceEngineConsts2.h

         *        TPEngTransactionOperation enumeration.

         */

        virtual void HandleAttributeTransactionError(

            TInt aError,

            CPEngAttributeTransaction2& aTransaction,

            TInt aTransactionOperation ) = 0;

    private: //Extensions

        /**

         * Reserved virtual table slots for future use.

         * Do not implement this.

         *

         * @since 3.0

         */

        virtual TInt AttributeTransactionReserved() {

            return KErrNotSupported;

            }

    protected:  //Destructor

        /**

         * Protected destructor.

         * Observers can't be destroyed via this interface.

         */

        virtual ~MPEngAttributeTransactionObserver2() { }

    };

#endif //__MPENGATTRIBUTETRANSACTIONOBSERVER2_H

//End of file