ncdengine/inc/ncdnodedependency.h
author Pat Downey <patd@symbian.org>
Tue, 18 May 2010 13:42:18 +0100
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Merge docml changeset, iby creation mods and sqlite_secure (bug 2548).
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/*
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* Copyright (c) 2006-2008 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:   Contains MNcdNodeDependency interface
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*
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*/
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#ifndef M_NCD_NODE_DEPENDENCY_H
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#define M_NCD_NODE_DEPENDENCY_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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class MNcdNodeDependencyInfo;
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/**
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 * Node dependency states
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 *
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 * @note Do not change the order of these enumerations
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 */
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enum TNcdDependencyState
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    {
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    /**
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     * Dependency has not been installed or is not present
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     */
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    ENcdDependencyMissing = 0, 
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    /**
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     * Dependency is present but there is an upgrade available
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     * on the server
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     */
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    ENcdDependencyUpgradeAvailable, 
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    /**
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     * Dependency is installed
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     */
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    ENcdDependencyInstalled    
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    };
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/**
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 *  This interface provides functions for the node that depends on
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 *  another nodes. The functions can be used to check what nodes
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 *  or node content this node depends on.
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 *
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 *  @see MNcdNode
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 *  @see MNcdNodeDependencyInfo
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 *
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 *  
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 */
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class MNcdNodeDependency : 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 = ENcdNodeDependencyUid };
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    /**
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     * Returns the dependency information about the nodes or content
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     * that this object depends from.
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     *
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     * @return Array of pointers to dependency information objects that 
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     *         this node depends on.
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     */
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    virtual const RPointerArray< MNcdNodeDependencyInfo >& DependencyInfos() const = 0;
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    /**
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     * Returns the collective state of the dependencies.
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     *
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     * The returned value will be ENcdDependencyMissing if any of the node's
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     * dependencies is missing, ENcdDependencyUpgradeAvailable if all of
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     * node's dependencies are installed but at least one has an upgrade 
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     * available or ENcdDependencyInstalled if all are installed and there are
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     * no upgrades available
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     *
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     * @return Node's dependencies' state
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     */
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    virtual TNcdDependencyState State() const = 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 ~MNcdNodeDependency() {}
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    };
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#endif // M_NCD_NODE_DEPENDENCY_H