harvester/composerplugins/imagecomposer/inc/locationrelationobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:34:07 +0200
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/*
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* Copyright (c) 2006-2009 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:  Image Composer's listener for changes in db location relations
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 *
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*/
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#ifndef LOCATIONRELATIONOBSERVER_H
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#define LOCATIONRELATIONOBSERVER_H
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#include "mdeharvestersession.h"
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#include "mdequery.h"
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// forward declarations
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class CMdENamespaceDef;
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class CComposerImagePlugin;
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/**
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 *  CLocationRelationObserver
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 * 
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 */
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class CLocationRelationObserver : public CBase, public MMdERelationObserver, public MMdEQueryObserver
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	{
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public:
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	// Constructors and destructor
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	/**
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	 * Destructor.
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	 */
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	~CLocationRelationObserver();
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	/**
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	 * Two-phased constructor.
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	 */
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	static CLocationRelationObserver* NewL( CMdESession* aSession, CComposerImagePlugin* aComposer );
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protected:
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	/**
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	 * Called to notify the observer that new relations has been
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	 * added/modified/removed in the metadata engine database.
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	 *
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	 * @param aSession session
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	 * @param aType defines if relation was added/modified/remove
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	 * @param aRelationIdArray IDs of relations
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	 */
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	void HandleRelationNotification(CMdESession& aSession,
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			TObserverNotificationType aType,
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			const RArray<TItemId>& aRelationIdArray);
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    /**
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     * Called to notify the observer that new results have been received 
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     * in the query.
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     * From MMdEQueryObserver.
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     *
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     * @param aQuery              Query instance that received new results.
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     * @param aFirstNewItemIndex  Index of the first new item that was added
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     *                            to the result item array.
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     * @param aNewItemCount       Number of items added to the result item 
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     *                            array.
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     *
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     * No implementation needed!
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     */
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    void HandleQueryNewResults( CMdEQuery& /*aQuery*/,
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        TInt /*aFirstNewItemIndex*/, TInt /*aNewItemCount*/ );
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    /**
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     * Handle query results.
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     * From MMdEQueryObserver.
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     *
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     * @param aQuery   Query instance that received new results.
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     * @param aError   Error code.
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     */
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    void HandleQueryCompleted( CMdEQuery& aQuery, TInt aError );
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private:
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	/**
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	 * Constructor for performing 1st stage construction
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	 */
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	CLocationRelationObserver();
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	/**
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	 * EPOC default constructor for performing 2nd stage construction
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	 */
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	void ConstructL( CMdESession* aSession, CComposerImagePlugin* aComposer );
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    /**
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     * Query the related image object ids from MdE database.
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     * @param aObjectIdArray  Array of Location object database ids.
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     */
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    void QueryRelationItemsL( );
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private:
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	/**
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	 * Pointer to default Mde namespace.
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	 */
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	CMdENamespaceDef* iDefaultNamespace;
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	/**
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	 * Pointer to Mde session.
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	 */
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	CMdESession* iSession;
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	/**
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	 * Pointer to a composer.
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	 */
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	CComposerImagePlugin* iComposer;	
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    /**
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     * MdE query object to use for querying relations
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     */
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    CMdERelationQuery* iQuery;	
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    TBool iQueryStarted;
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    RArray<TItemId> iRelationIdArray;
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	};
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#endif // LOCATIONRELATIONOBSERVER_H
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