How to prevent setBoundingThemes returning null MBR when no data are found

I am using setBoundingThemes method in MapViewer bean to zoom in to query results in a JDBCTheme. It is possible however that the JDBCTheme doesn't contain any data when no rows match the criteria. The result is that the other themes are queried without a filter and the overall map size is used (as the result of the mbr of all themes). This wouldn't be a problem if the theme_min_scale was considered, but it isn't, so all available data are rendered and this takes quite a while. Is there a way to set an alternative query window which will be used in case no rows are returned?
To show the difference:
Using a JDBCTheme with results:
a valid mbr is found:Thu Jun 09 19:44:48 CEST 2005 FINEST [oracle.sdovis.MapMaker] mbr of all bounding themes: java.awt.geom.Rectangle2D$Double[x=5.03750183491323,y=52.05182293319411,w=0.12810743017353943,h=0.08182653361177472]
the resulting query for the (predefined) LOCALROAD theme:Thu Jun 09 19:44:48 CEST 2005 FINEST [oracle.sdovis.theme.pgtp] [ LOCALROAD ]: 5.03750183491323,52.05182293319411,5.165609265086769,52.133649466805885
Thu Jun 09 19:44:48 CEST 2005 FINEST [oracle.sdovis.theme.pgtp] [ LOCALROAD ]: SELECT ROWID, GEOM, 'CSX:L.ALLROADS', NAME, 'CSX:T.ROAD NAME', 1, ID FROM MN_NW WHERE MDSYS.SDO_FILTER(GEOM, MDSYS.SDO_GEOMETRY(2003, 8307, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 3), MDSYS.SDO_ORDINATE_ARRAY(?, ?, ?, ?)), 'querytype=WINDOW') = 'TRUE'
Using a JDBCTheme without results:
a null mbr is foundThu Jun 09 19:48:34 CEST 2005 WARN [oracle.sdovis.MapMaker] Null MBR resulted from buildDataMBR(themes).
the resulting query for the (predefined) LOCALROAD theme:Thu Jun 09 19:48:34 CEST 2005 FINEST [oracle.sdovis.theme.pgtp] [ LOCALROAD ]: -Infinity,-Infinity,NaN,NaN
Thu Jun 09 19:48:34 CEST 2005 FINEST [oracle.sdovis.theme.pgtp] [ LOCALROAD ]: SELECT ROWID, GEOM, 'CSX:L.ALLROADS', NAME, 'CSX:T.ROAD NAME', 1, ID FROM MN_NW'
and after that the mbr is made up out of all themes, resulting in a map of all available dataThu Jun 09 19:56:19 CEST 2005 FINEST [oracle.sdovis.MapMaker] mbr of all themes: java.awt.geom.Rectangle2D$Double[x=-0.5,y=-2.6605568400000004,w=11.025,h=58.665278322000006]
Of course I could query the database first to find out if there are any geo data available, but I am hoping there's another way. Anybody who can help?
Regards,
Ida

Hi Ida,
I think just the size parameter with null mbr for the bounding theme won't help too much.
We would need a reference point to be used with this size. This point we could get if we query the other themes, but as we don't have a reference mbr (the bounding theme mbr is null) this would be a full query on the other themes.
We will discuss your suggestion of not rendering any theme and raising an exception if the mbr for the bounding theme returns null.
Thanks.
Joao

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