Just for curiosity: When I load a larger polygon shapefile (burlulc) I recognized that the geometries share a lot of common vertices. In case of the burlulc layer over 1,500,000. They are represented by com.vividsolutions.jts.geom.Coordinate objects. If a shapefile gets loaded a new Coordinate object for each vertex is created.
Now I added a simple TreeMap to the PolygonHandler of OpenJUMP's shapefile reader to reuse already created Coordinate objects and share them with other geometries. After loading the data (+ triggering GC) the normal OJ uses approx. 124MB memory. After the the shared vertices modification OJ uses only approx. 89MB. My question: May this mod lead to any side effects? With JTS? With the CursorTools? Coordinate objects are not immutable, so I expect side effects with e.g. neighboring polygons when I edit one of them. I had a brief look at the code and played with the CursorTools but I haven't found any side effects yet. This idea comes from playing with OJ on a boring friday evening. It only costs me a few seconds to implement and if you say "This idea is plain stupid!" I'll drop it immediately .. ;-) Kind regards, Sascha ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
