ncdengine/inc/ncdnodeuserdata.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:   Contains MNcdNodeUserData
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*
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*/
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#ifndef M_NCD_NODE_USER_DATA_H
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#define M_NCD_NODE_USER_DATA_H
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#include <e32cmn.h>
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#include "catalogsbase.h"
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#include "ncdinterfaceids.h"
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/**
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 *  Provides functions to handle the user data of the node.
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 *  User data is meant for clients side to save some custom information
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 *  relating to a node. So, client can also read its own settings from engine
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 *  by using functions provided by this interface. For example, if the
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 *  client wants to set the node hidden and save this value to the node it may
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 *  use user data functions.
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 *
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 *  The format of the data is entirely up to the client. The engine saves
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 *  the user data as a single binary data entry.
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 *
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 *  
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 */
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class MNcdNodeUserData : public virtual MCatalogsBase
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    {
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public:
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    /**
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     * Unique identifier for the interface, required for all MCatalogsBase interfaces.
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     *
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     * 
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     */
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    enum { KInterfaceUid = ENcdNodeUserDataUid };
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    /**
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     * Gives the user data that has been saved in database for the node.
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     *
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     * @return User data.
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     * Ownership of the heap descriptor is transferred to the caller. If the
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     * node has no user data set, a NULL pointer is returned.
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     * @exception Leave System wide error codes.
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     */
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    virtual HBufC8* UserDataL() const = 0;
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    /**
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     * Sets user data for the node.
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     * 
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     * @param aData is the data that is saved to the node information. If NULL,
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     *  clears the previously set user data. Ownership of aData is not transferred.
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     * @exception Leave System wide error codes.
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     */
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    virtual void SetUserDataL( const TDesC8* aData ) = 0;    
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protected:
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    /**
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    * Destructor.
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    *
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    * @see MCatalogsBase::~MCatalogsBase
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    */
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    virtual ~MNcdNodeUserData() {}
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    };
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#endif // M_NCD_NODE_USER_DATA_H