iaupdate/IAD/engine/inc/iaupdateanynode.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2007-2008 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:   This file contains the header file of MIAUpdateAnyNode class 
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*
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*/
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#ifndef IA_UPDATE_ANY_NODE_H
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#define IA_UPDATE_ANY_NODE_H
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class MIAUpdateBaseNode;
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/**
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 * MIAUpdateAnyNode
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 * This interface provides enumerations for the node types.
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 * Classes that implement this interface provide information
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 * about their type. By using the type information, 
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 * a MIAUpdateAnyNode object can be static casted to a more
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 * specific object if necessary. This can be usefull, for example,
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 * when arrays for MIAUpdateAnyNode objects are used. Also,
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 * a function to get the base node is provided. So, common
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 * information for all the nodes can be gotten through this
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 * interface without casting the object.
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 *
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 * @see MIAUpdateBaseNode
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 * @see MIAUpdateNormalNode
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 * @see MIAUpdateFwNode
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 */
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class MIAUpdateAnyNode
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    {
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public:
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    /**
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     * These enumerations provide known node types that
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     * can be interpreted as known more specific interfaces.
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     */
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    enum TNodeType
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        {
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        /**
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         * Node type is not defined.
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         * Static casting of the node should be avoided.
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         */
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        ENodeTypeNotDefined,
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        /**
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         * Node is normal node.
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         * @see MIAUpdateNode
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         */
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        ENodeTypeNormal,
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        /**
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         * Node is firmware node.
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         * @see MIAUpdateFwNode
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         */        
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        ENodeTypeFw
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        };
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    /**
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     * @return TNodeType Describes the type of the node. 
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     */
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    virtual TNodeType NodeType() const = 0;
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    /**
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     * @return MIAUpdateBaseNode& Base interface for nodes.
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     * This interface provides common details for all the different nodes.
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     */
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    virtual MIAUpdateBaseNode& Base() = 0;
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protected:
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    /**
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     * Protected destructor to prevent deletion.
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     */    
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    virtual ~MIAUpdateAnyNode() { }
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    };
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#endif // IA_UPDATE_ANY_NODE_H