--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/harvester/composerplugins/imagecomposer/inc/locationrelationobserver.h	Mon Jan 18 20:34:07 2010 +0200
@@ -0,0 +1,136 @@
+/*
+* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Image Composer's listener for changes in db location relations
+ *
+*/
+
+
+#ifndef LOCATIONRELATIONOBSERVER_H
+#define LOCATIONRELATIONOBSERVER_H
+
+#include "mdeharvestersession.h"
+#include "mdequery.h"
+
+// forward declarations
+class CMdENamespaceDef;
+class CComposerImagePlugin;
+
+/**
+ *  CLocationRelationObserver
+ * 
+ */
+class CLocationRelationObserver : public CBase, public MMdERelationObserver, public MMdEQueryObserver
+	{
+public:
+	// Constructors and destructor
+
+	/**
+	 * Destructor.
+	 */
+	~CLocationRelationObserver();
+
+	/**
+	 * Two-phased constructor.
+	 */
+	static CLocationRelationObserver* NewL( CMdESession* aSession, CComposerImagePlugin* aComposer );
+
+protected:
+
+	/**
+	 * Called to notify the observer that new relations has been
+	 * added/modified/removed in the metadata engine database.
+	 *
+	 * @param aSession session
+	 * @param aType defines if relation was added/modified/remove
+	 * @param aRelationIdArray IDs of relations
+	 */
+
+	void HandleRelationNotification(CMdESession& aSession,
+			TObserverNotificationType aType,
+			const RArray<TItemId>& aRelationIdArray);
+	
+    /**
+     * Called to notify the observer that new results have been received 
+     * in the query.
+     * From MMdEQueryObserver.
+     *
+     * @param aQuery              Query instance that received new results.
+     * @param aFirstNewItemIndex  Index of the first new item that was added
+     *                            to the result item array.
+     * @param aNewItemCount       Number of items added to the result item 
+     *                            array.
+     *
+     * No implementation needed!
+     */
+    void HandleQueryNewResults( CMdEQuery& /*aQuery*/,
+        TInt /*aFirstNewItemIndex*/, TInt /*aNewItemCount*/ );
+
+    /**
+     * Handle query results.
+     * From MMdEQueryObserver.
+     *
+     * @param aQuery   Query instance that received new results.
+     * @param aError   Error code.
+     */
+    void HandleQueryCompleted( CMdEQuery& aQuery, TInt aError );
+	
+private:
+
+	/**
+	 * Constructor for performing 1st stage construction
+	 */
+	CLocationRelationObserver();
+
+	/**
+	 * EPOC default constructor for performing 2nd stage construction
+	 */
+	void ConstructL( CMdESession* aSession, CComposerImagePlugin* aComposer );
+	
+    /**
+     * Query the related image object ids from MdE database.
+     * @param aObjectIdArray  Array of Location object database ids.
+     */
+    void QueryRelationItemsL( );
+	
+	
+private:
+
+	/**
+	 * Pointer to default Mde namespace.
+	 */
+	CMdENamespaceDef* iDefaultNamespace;
+
+	/**
+	 * Pointer to Mde session.
+	 */
+	CMdESession* iSession;
+
+	/**
+	 * Pointer to a composer.
+	 */
+	CComposerImagePlugin* iComposer;	
+	
+    /**
+     * MdE query object to use for querying relations
+     */
+    CMdERelationQuery* iQuery;	
+    
+    TBool iQueryStarted;
+    
+    RArray<TItemId> iRelationIdArray;
+
+	};
+
+#endif // LOCATIONRELATIONOBSERVER_H
+