I need to change the Geoserver source code to offset data before the map can be 
published on the web browser.
My customer does not want to disclose precise GIS data and maps to the 
developers who are not on client site. 
My customer gives me a jar file which can randomly create data for offsetting.  
I can get these random data.
What should I do is as follow:
1, I need to get data from database (Oracle or PostGIS).
2, get data from the jar file to offset all GIS data in the map. For example, 
30% points of these data should be moved to south 100m.  30% points should be 
moved to north 10m.
    The rest of points should be moved to east 25m. 
3, After getting data from step 2, Geoserver can create new maps that all 
points are not at their original place.
4, I use SLD (SLD with parameters) to offset maps but this solution is not 
acceptable.
 
How to modify the source code of Geoserver 2.0.1?
                                          
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