--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/collectionframework/thumbnailcreator/inc/mglxtnvolumedatabaseobserver.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,99 @@
+/*
+* 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 CGlxtnVolumeDatabase
+*
+*/
+
+
+
+
+/**
+ * @internal reviewed 30/07/2007 by Simon Brooks
+ */
+
+#ifndef M_GLXTNVOLUMEDATABASEOBSERVER_H
+#define M_GLXTNVOLUMEDATABASEOBSERVER_H
+
+#include "glxtnstd.h"   // For TGlxImageDataFormat
+
+/**
+ * Typesafe thumbnail ID.
+ */
+class TGlxtnThumbnailIdTypeBase {};     // Don't use this
+typedef TGlxId<TGlxtnThumbnailIdTypeBase> TGlxtnThumbnailId;    // Use this
+
+/**
+ * Interface to receive callbacks from a CGlxtnVolumeDatabase.
+ *
+ * @author Dan Rhodes
+ * @ingroup glx_thumbnail_creator
+ */
+class MGlxtnVolumeDatabaseObserver
+    {
+public:
+    /**
+    * Called when a database operation cannot be completed.
+    * @param aError Error code.
+    */
+    virtual void HandleDatabaseError(TInt aError) = 0;
+    /**
+    * Called when a thumbnail ID has been found in the Ids table.
+    * @param aThumbId Thumbnail ID for the media item.
+    */
+    virtual void HandleThumbnailIdFromMediaIdL(
+                                    const TGlxtnThumbnailId& aThumbId ) = 0;
+    /**
+    * Called when a thumbnail ID has been found in the Items table.
+    * @param aThumbId Thumbnail ID for the media item.
+    */
+    virtual void HandleThumbnailIdFromFilenameL(
+                                    const TGlxtnThumbnailId& aThumbId ) = 0;
+    /**
+    * Called when a thumbnail ID has been saved in the Ids table.
+    */
+    virtual void HandleThumbnailIdStoredL() = 0;
+    /**
+    * Called when a thumbnail has been found in the Thumbnails table.
+    * @param aFormat Thumbnail data format.
+    * @param aData Thumbnail binary data (ownership passed).
+    */
+    virtual void HandleThumbnail(TGlxImageDataFormat aFormat, HBufC8* aData) = 0;
+    /**
+    * Called when a thumbnail has been saved in the Thumbnails table.
+    */
+    virtual void HandleThumbnailStored() = 0;
+    /**
+    * Called when a record has been deleted from a Ids table.
+    */
+    virtual void HandleMediaIdDeletedL() = 0;
+    /**
+    * Called when records have been deleted from a Thumbnails table.
+    */
+    virtual void HandleThumbnailsDeletedL() = 0;
+    /**
+    * Called when a record has been deleted from a Items table.
+    */
+    virtual void HandleItemDeletedL() = 0;
+    /**
+    * Called when availability has been chaecked.
+    * @param aResult The result of the check.
+    */
+    virtual void HandleAvailabilityChecked(TInt aResult) = 0;
+    /**
+    * Called after the database has been cleaned up.
+    */
+    virtual void HandleDatabaseCleanedL() = 0;
+    };
+
+#endif  // M_GLXTNVOLUMEDATABASEOBSERVER_H