ncdengine/inc/ncdloadnodeoperationobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2006 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:   ?Description
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*
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*/
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#ifndef M_NCD_LOAD_NODE_OPERATION_OBSERVER_H
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#define M_NCD_LOAD_NODE_OPERATION_OBSERVER_H
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#include <e32cmn.h>
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#include "catalogsarray.h"
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class MNcdLoadNodeOperation;
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class MNcdQuery;
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class MNcdNode;
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/**
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 *  Observer interface for node load operations
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 *
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 *  Node load operation users should implement this interface to be able to
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 *  receive callbacks.
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 *
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 *  The observer can show progress via either the progress variable or by
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 *  loaded nodes count / total count of nodes to load or both.
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 *
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 *  
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 *  @see MNcdLoadNodeOperation
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 */
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class MNcdLoadNodeOperationObserver
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    {
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public:
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    /**
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     * Called when nodes have been updated. This may be called numerous 
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     * times during one operation. The nodes can now be queried for name,
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     * description etc. information.
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     *
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     * 
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     * @param aOperation Reference to the operation reporting the updates.
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     *  Uncounted; if the observer implementation wants to save
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     *  the operation pointer for later use, it must call AddRef() for
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     *  it first, and Release() after use.
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     * @param aNodes Array of pointers to updated nodes. The references
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     *  in the array are uncounted; if the observer implementation wants to
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     *  save a node pointer for later use, it must call AddRef() for it first,
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     *  and Relese() after is no longer needed.
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     */
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    virtual void NodesUpdated( MNcdLoadNodeOperation& aOperation,
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                               RCatalogsArray< MNcdNode >& aNodes ) = 0;
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    /**
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     * Called when a query has been received for an operation. The query
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     * object can be obtained from the operation object with
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     * MNcdOperation::QueryL().
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     *
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     * @note Querys need to be completed with MNcdOperation::CompleteQueryL()
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     *       to continue the operation! Alternatively, the operation must be
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     *       cancelled.
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     * 
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     * 
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     * @see MNcdOperation
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     * @see MNcdQuery
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     * @param aOperation Uncounted reference to the operation object that sent
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     *  the event.
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     * @param aQuery Pointer to the query that must be completed. Counted, Release()
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     *        must be called after use.
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     * @see MNcdOperation::CompleteQueryL()
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     */
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    virtual void QueryReceived( MNcdLoadNodeOperation& aOperation,
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                                MNcdQuery* aQuery ) = 0;
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    /**
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     * Called when an operation has been completed.
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     *
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     * 
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     * @param aOperation Reference to the operation that sent the event.
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     *  Uncounted; if the observer implementation wants to save
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     *  the operation pointer for later use, it must call AddRef() for
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     *  it first, and Release() after use.
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     * @param aError Error code for operation completion. 
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     *               KErrNone for successful completion, 
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     *               KErrNoMasterServerUri if the master server URI has not been set 
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     *               (possible only when loading root node),
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     *               otherwise a system wide error code.
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     */
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    virtual void OperationComplete( MNcdLoadNodeOperation& aOperation,
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                                    TInt aError ) = 0;
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    };
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#endif //  M_NCD_LOAD_NODE_OPERATION_OBSERVER_H