ncdengine/inc/ncdprovider.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 MNcdProvider interface
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*
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*/
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#ifndef M_NCD_PROVIDER_H
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#define M_NCD_PROVIDER_H
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#include <e32cmn.h>
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#include "catalogsbase.h"
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#include "catalogsarray.h"
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#include "ncdinterfaceids.h"
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#include "ncdschemenodetype.h"
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class MNcdNode;
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class MNcdNodeContainer;
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class MNcdProviderObserver;
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class MNcdOperation;
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class CNcdKeyValuePair;
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class MNcdPurchaseHistory;
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class MNcdSubscriptionManager;
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class MNcdKeyValuePair;
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class MNcdClientLocalizer;
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class MNcdFileDownloadOperation;
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class MNcdFileDownloadOperationObserver;
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class MNcdPurchaseDetails;
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class TNcdConnectionMethod;
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/**
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 *  MNcdProvider provides functions to NCD specific functionality, such as
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 *  purchase history access, subscription management, search, observing major
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 *  events etc.
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 *
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 *  
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 */
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class MNcdProvider : 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 = ENcdProviderUid };        
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    /**
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     * Set the provider observer interface.
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     *
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     * @note NCD provider client should always set an observer to get callbacks.
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     *
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     * 
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     * @param aObserver Observer interface to receive NCD provider callbacks. If NULL,
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     *  no callbacks will be made.
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     */
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    virtual void SetObserver( MNcdProviderObserver* aObserver ) = 0;
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    /**
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     * Returns the root node for the provider. Root node provides access to
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     * node hierarchy.
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     *
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     * 
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     * @return Pointer to root node object. Counted, Release() must be
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     *  called after use.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdNode* RootNodeL() = 0;
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    /**
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     * Returns a list of currently active operations for progress monitoring and
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     * operation management.
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     * The returned operation objects have their reference counts incremented, the
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     * items must be released after use e.g. with a call to the array's ResetAndDestroy().
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     *
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     * @note Lifetime of the operation objects cannot exceed the lifetime of the
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     *  provider object. If there are unreleased references to a provider's operation
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     *  objects when the last reference to the provider object is released, a panic
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     *  will be raised.
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     *
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     * 
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     * @return List of operation object pointers.
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     * @exception Leave System wide error code.
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     * @see MNcdOperation
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     */
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    virtual RCatalogsArray< MNcdOperation > OperationsL() const = 0;
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    /**
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     * Returns a handle to purchase history. Purchased, downloaded and installed
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     * content can be accessed via the purchase history.
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     *
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     * 
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     * @return Pointer to purchase history object. Counted, Release() must be called
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     *  after use.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdPurchaseHistory* PurchaseHistoryL() const = 0;
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    /**
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     * Returns a pointer to subscription manager object.
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     *
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     * 
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     * @return Pointer to subscription manager. Counted, Release() must be called
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     *  after use.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdSubscriptionManager* SubscriptionsL() const = 0;
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    /**
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     * Adds a configuration that will be sent to content providers.
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     *
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     * Only one value per key is accepted. If the key already exists, it's old value
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     * is replaced with the new one. The only exception are keys that match 
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     * NcdConfigurationKeys::KCapability. The number of capability keys is not limited,
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     * but their (folded) values are ensured to be unique.
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     *
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     * 
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     * @param aConfiguration Configuration to be added.
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     * @see MNcdProvider::RemoveConfigurationL
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     * @see NcdConfigurationKeys
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     * @exception Leave System wide error code.
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     */
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    virtual void AddConfigurationL( const MNcdKeyValuePair& aConfiguration ) = 0;
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    /**
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     * Removes a configuration. This configuration will no longer be sent to 
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     * content providers.
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     *
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     * 
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     * @param aKey Key of the configuration to be removed.
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     * @exception KErrNotFound The configuration is not present.
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     * @exception KErrAccessDenied The configuration has been added by the root-node
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     *            provider and can not be removed by the user.
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     * @see MNcdProvider::AddConfigurationL
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     */
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    virtual void RemoveConfigurationL( const TDesC& aKey ) = 0;
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    /**
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     * Returns a list of configurations that are used when communicating with
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     * content providers. 
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     *
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     * 
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     * @return Current configuration as an array of key-value pairs. Ownership
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     *  of the objects within the array is transferred to the caller, they must
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     *  be deleted after use e.g. calling RPointerArray::ResetAndDestroy().
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     * @see MNcdProvider::AddConfigurationL
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     * @see MNcdProvider::RemoveConfigurationL
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     * @exception KErrNotFound if no configurations have been set
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     * @exception Leave System wide error code.
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     */
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    virtual RPointerArray< CNcdKeyValuePair > ConfigurationsL() const = 0;
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    /**
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     * Retrieves a node identified by a namespace Id and a node Id.
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     *
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     * 
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     * @param aNameSpaceId  Namespace of the requested node. Node Ids are unique
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     *                      inside a specific namespace.
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     * @param aNodeId       Id of the requested node.
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     *
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     * @return Pointer to the requested node object. Note, that the node may be
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     *  in an uninitialized state, or in an initialized state, depending on
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     *  whether all the required node information has previously been loaded 
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     *  from the server.
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     *  Counted, Release() must be called after use.
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     * @exception Leave KErrNotFound if the node is not found from the RAM or database
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     *  cache.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdNode* NodeL( const TDesC& aNameSpaceId, 
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                             const TDesC& aNodeId ) const = 0;
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    /**
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     * Retrieves a node identified by purchase history details
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     *
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     * 
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     * @param aDetails  Purchase details
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     *
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     * @return Pointer to the requested node object. Note, that the returned node
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     *  is not located in the normal browsing hierarchy but it is just hanging by
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     *  itself as a temporary node. If the metadata that corresponds the purchase details 
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     *  is found from the RAM or database cache, that metadata will be used for the node. 
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     *  If the metadata can not be found, then it will be initialized with the values 
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     *  provided by the corresponding purchase details.
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     *  Counted, Release() must be called after use.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdNode* NodeL( const MNcdPurchaseDetails& aDetails ) const = 0;
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    /**
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     * Retrieves a scheme node identified by a namespace Id, a node metadata Id and
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     * a server URI. If the scheme node is created, it will not have any parent. The scheme
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     * node is automatically set as favourite node.
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     *
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     * 
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     * @param aNameSpaceId  Namespace of the requested node. Node Ids are unique
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     *                      inside a specific namespace.
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     * @param aEntityId     Id of the requested node metadata.
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     * @param aServerUri    Server URI of the requested node.
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     * @param aType         Type of the scheme node.
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     * @param aRemoveOnDisconnect If ETrue, the scheme node is removed from favourites when
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     *                      the client-server session is closed.
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     * @param aForceCreate  ETrue means that, if necessary, a scheme node will always 
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     *                      be created. Notice, that an uninitialized node object will be 
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     *                      returned for an invalid name space or node metadata id.
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     *                      EFalse means that the scheme node will be returned 
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     *                      only if the node itself or the metadata for it already
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     *                      existed in the RAM or database cache. 
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     *
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     * @return Pointer to the requested node object. Note, that the node may be
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     *  in an uninitialized state, or in an initialized state, depending on
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     *  whether the node has previously been known to the engine.
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     *  Counted, Release() must be called after use.
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     * @exception Leave KErrNotFound if aForceCreate parameter has been set as EFalse 
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     *  and the metadata is not found from the RAM or database cache.
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     * @exception Leave KErrArgument if the metadata already exists but is of different
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     *  type than the given scheme node type.
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     * @exception Leave System wide error code.
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     */
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    virtual MNcdNode* SchemeNodeL( const TDesC& aNameSpaceId,
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                                   const TDesC& aEntityId,
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                                   const TDesC& aServerUri,
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                                   TNcdSchemeNodeType aType,
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                                   TBool aRemoveOnDisconnect,
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                                   TBool aForceCreate ) const = 0;
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    /**
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     * Sets the client string localizer interface to be used for server-initiated
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     * localizable string information.
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     *
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     * 
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     * @param aLocalizer Localizer to be used for translating localization keys
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     *  into user viewable strings.
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     */
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    virtual void SetStringLocalizer( MNcdClientLocalizer& aLocalizer ) = 0;
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    /**
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     * Downloads a file from the given URI. The file is not handled by the engine, 
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     * the file should be handled by the user of this interface as it sees fit.
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     *
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     * @note The reference count of the operation object is increased by one. 
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     * So, Release function of the operation should be called when the operation 
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     * is not needed anymore.
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     *
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     * @note The file will be moved to the target location after it has been 
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     * fully downloaded. Any existing file with the same name will be overwritten.
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     *
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     * 
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     * @param aUri Source URI
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     * @param aTargetFileName Full path and name for the target file.
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     * @param aObserver
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     */
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    virtual MNcdFileDownloadOperation* DownloadFileL( const TDesC& aUri,
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        const TDesC& aTargetFileName,
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        MNcdFileDownloadOperationObserver& aObserver ) = 0;
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    /**
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     * Sets the default connection method used for network access.
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     *
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     * @note Not stored persistently. A client needs to set this again every time it
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     *  creates the provider.
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     *
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     * 
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     * @param aMethod Identifier of the connection method to use by default.
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     */    
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    virtual void SetDefaultConnectionMethodL( 
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        const TNcdConnectionMethod& aMethod ) = 0;
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    /**
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     * Clears all search results. This method should be called before starting a new
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     * search. 
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     *
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     * @note This method only marks the search result nodes for removal and makes them
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     * unavailable, therefore it doesn't take a long time to complete. 
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     * @note Previous result nodes need to be released to remove them from cache.
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     */
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    virtual void ClearSearchResultsL() = 0;
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    /**
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     * Clears the entire client cache (nodes, icons, previews)
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     *
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     * @note The client should release all nodes and close all open files before 
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     * calling this method.
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     */
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    virtual void ClearCacheL( TRequestStatus& aStatus ) = 0;
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    /**
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     * Tells whether the SIM was changed or removed since the previous startup.
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     *
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     * @return ETrue If the SIM was changed or removed, otherwise EFalse.
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     */
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    virtual TBool IsSimChangedL() = 0;
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    /**
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     * Tells whether fixed access point defined in engine's configuration file is used.
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     * In this case AP selection possibility may need to be disabled in UI.
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     *
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     * @return ETrue If fixed AP is used, otherwise EFalse.
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     * @leave System wide error code.
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     */
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    virtual TBool IsFixedApL() = 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 ~MNcdProvider() {}
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    };
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#endif // M_NCD_PROVIDER_H