--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/collectionframework/datasource/manager/inc/mglxdatasource.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,85 @@
+/*
+* Copyright (c) 2008-2009 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: Definition of the Data Source Mixin Class.
+*
+*/
+
+
+
+
+#ifndef _MGLXDATASOURCE_H_
+#define _MGLXDATASOURCE_H_
+
+// INCLUDES
+#include <e32cmn.h>
+#include "mglxdatasourceupdateobserver.h"
+#include "mglxdatasourcerequestobserver.h"
+
+// FORWARD DECLARATIONS
+class CGlxRequest;
+
+// CONSTANTS
+
+// CLASS DECLARATION
+
+/**
+ *  MGlxDataSource class 
+ *
+ *  Data Source  collates Data Source information.
+ *  @lib GlxDataSource.lib
+ *	@ingroup collection_component_design
+ *  @internal reviewed 11/07/2007 by Dave Schofield
+ */
+class MGlxDataSource 
+	{
+public:
+	/**
+	 * Asynchronous call to retrieve 
+	 * 
+	 * @param aListId list for this query relates to
+	 * @return error code
+	 */
+	virtual void DataSourceRequestL(CGlxRequest* aRequest, MGlxDataSourceRequestObserver& aObserver) = 0;
+	/**
+	 * Cancel asynchronous request call
+	 * as each requestor can only have one active request the observer is sufficient to cancel the request.
+	 * 
+	 */
+	virtual void CancelRequest(MGlxDataSourceRequestObserver& aObserver) = 0;
+public:
+
+	/**
+	 * Since there should be only one data source manager for a server,
+	 * clients can use this function to either create the instance or 
+	 * return the pointer if the instance already exists.
+	 *
+	 * The pointers are reference counter, and the instance is deleted after
+	 * there are no more clients. It is, therefore, necessary
+	 * to release the instance by calling Close() when no longer needed.
+	 *
+	 * @returns a pointer to a new or existing list manager instance
+	 */
+	IMPORT_C static MGlxDataSource* OpenDataSourceL(const TUid& aDataSource, MGlxDataSourceUpdateObserver& aObserver);
+	
+
+	/**
+	 * Decrements the reference count of the data source manager. Deletes the 
+	 * data source manager if there are no more references.
+	 */
+	virtual void Close(MGlxDataSourceUpdateObserver& aObserver)=0;
+	};
+
+
+
+#endif //_MGLXDATASOURCE_H_
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