ncdengine/inc/ncdnodemetadata.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 MNcdNodeMetadata interface
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*
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*/
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#ifndef M_NCD_NODE_METADATA_H
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#define M_NCD_NODE_METADATA_H
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#include <e32cmn.h>
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#include <e32std.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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class MNcdNodeContainer;
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class MNcdLoadNodeOperation;
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class MNcdQuery;
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class CNcdKeyValuePair;
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/**
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 *  Node metadata contains the basic information about the content.
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 *  Mainly this interface provides functions that can be used to show
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 *  various information about the node in the UI.
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 *
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 *  This interface can be queried from a node object after its metadata
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 *  has been downloaded to the terminal. Metadata can be downloaded by
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 *  calling the node object's MNcdNode::LoadL() method.
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 *
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 *  
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 */
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class MNcdNodeMetadata : 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 = ENcdNodeMetadataUid };
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    /**
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     * Gets the metadata id.
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     *
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     * 
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     * @return Id of the node.
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     */
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    virtual const TDesC& Id() const = 0;
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    /**
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     * All nodes and their content are part of a namespace. Within the
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     * namespace, identifiers are unique. This function returns the namespace
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     * of this metadata and its contents. This namespace should always be same
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     * as the namespace of the node that may own this metadata.
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     *
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     * 
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     * @return The namespace identifier. If the protocol has not defined
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     *         any value, an empty descriptor is returned.
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     */
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    virtual const TDesC& Namespace() const = 0;
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    /**
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     * Retrieves the node name in text format.
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     *
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     * 
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     * @return Name of the node. If the protocol has not defined any value
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     *         for name, an empty descriptor is returned.
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     */
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    virtual const TDesC& Name() const = 0;
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    /**
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     * Retrieves the node description in text format.
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     * 
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     * 
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     * @return Description for the node. If the protocol has not defined
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     *         any value for description, an empty descriptor is returned.
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     */
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    virtual const TDesC& Description() const = 0;
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    /**
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     * Gets the disclaimer for the node in a query format.
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     *
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     * @note Query is used here just to give disclaimer information. The metadata
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     * object does not care how the query is handled by the caller. SetResponseL
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     * of the query may be used but the given response is not saved into the database.
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     * Instead the set response information is availabe only while the metadata object
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     * is alive. Use MNcdNodeUserData interface object if information about acception 
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     * or rejection of the disclaimer should be saved to the database.
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     *
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     * 
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     * @return Disclaimer query for the node. If the protocol has not defined
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     *         any value, then NULL is returned. When a disclaimer query is returned,
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     *         the user should Release the query when the object is not needed anymore  
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     *         because the Disclaimer reference count is increase by one.
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     */
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    virtual MNcdQuery* Disclaimer() const = 0;
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    /**
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     * Gets the action name for the item.
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     *
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     * For example, the action for an item could be "Open", "Launch" or "Play"
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     * etc.
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     *
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     * 
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     * @return Action name string for the item.
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     */
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    virtual const TDesC& ActionName() const = 0;
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    /**
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     * Determines if the node is specified to be "always visible" in the client
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     * UI. What this actually means is determined by the UI client
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     * implementation. The idea is to give maximum visibility and availability
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     * to the item for the user.
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     *
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     * 
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     * @return ETrue if the item should be always visible, EFalse otherwise.
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     */
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    virtual TBool IsAlwaysVisible() const = 0;
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    /**
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     * Retrieves the layout type in text format.
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     *
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     * 
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     * @return The layout type or empty string if not defined.
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     */
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    virtual const TDesC& LayoutType() const = 0;
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    /**
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     * Gets the more info for the node in a query format. This is a message
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     * with a body of text to be shown.
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     *
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     * @note Query is used here just to give more info information. The metadata
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     * object does not care how the query is handled by the caller. SetResponseL
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     * of the query may be used but the given response is not saved into the database.
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     *
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     * 
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     * @return More info query for the node. If the protocol has not defined
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     *         any value, then NULL is returned. When a query is returned,
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     *         the user should Release the query when the object is not needed anymore  
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     *         because the reference count is increased by one.
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     */
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    virtual MNcdQuery* MoreInfo() const = 0;
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    /**
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     * Gets the details of this node. Details are additional information that
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     * can be used e.g. to categorize nodes. Details are represented as key-value
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     * pairs, for example: "artist:artist_name" or "album:album_name".
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     * 
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     * 
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     * @return An array containing all the details of this node.
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     */
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    virtual const RPointerArray< CNcdKeyValuePair >& Details() 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 ~MNcdNodeMetadata() {}
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    };
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#endif // M_NCD_NODE_METADATA_H