/*

* Copyright (c) 2006 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 definition for download operations

*

*/

#ifndef M_NCD_DOWNLOAD_OPERATION_OBSERVER_H

#define M_NCD_DOWNLOAD_OPERATION_OBSERVER_H

#include <e32cmn.h>

class TNcdProgress;

class MNcdDownloadOperation;

class MNcdQuery;

/**

 *  Observer interface for download operations

 *

 *  Download operation users should implement this interface to be able to

 *  receive callbacks.

 *

 * 

 */

class MNcdDownloadOperationObserver

    {

public:

    /**

     * Called when a download has progressed. The progress value

     * is relative to the current file being downloaded.

     *

     * 

     * @param aOperation The operation that sent the event.

     * @param aProgress Progress of the operation.

     */

    virtual void DownloadProgress( MNcdDownloadOperation& aOperation,

        TNcdProgress aProgress ) = 0;

    /**

     * Called when a query has been received for an operation.

     *

     * @note Querys need to be completed with MNcdOperation::CompleteQueryL()

     *       to continue the operation! Alternatively, the operation must be

     *       cancelled.

     * 

     * 

     * @see MNcdOperation

     * @see MNcdQuery

     * @param aOperation The operation that sent the event.

     * @param aQuery Pointer to the query object that needs to be

     *        completed. Counted, Release() must be called after use.

     * @see MNcdOperation::CompleteQueryL()

     */

    virtual void QueryReceived( MNcdDownloadOperation& aOperation,

        MNcdQuery* aQuery ) = 0;

    /**

     * Called when an operation has been completed.

     *

     * 

     * @param aOperation The operation that sent the event.

     * @param aError Error code for operation completion.

     *               KErrNone for successful completion, otherwise a system

     *               wide error code.

     */

    virtual void OperationComplete( MNcdDownloadOperation& aOperation,

        TInt aError ) = 0;

    };

#endif //  M_NCD_DOWNLOAD_OPERATION_OBSERVER_H