gvSIG data provider for OpenStreetMap (raster)

public class TestProjection {

        public static void main(String[] args) {

                int zoom = 1;

                double lat = -85d;

                double lon = -180d;

                System.out.println("http://tile.openstreetmap.org/" + getTileNumber(lat, lon, zoom) + ".png");

        }

        public static String getTileNumber(final double lat, final double lon, final int zoom) {

                int xtile = (int)Math.floor( (lon + 180) / 360 * (1<<zoom) ) ;

                int ytile = (int)Math.floor( (1 - Math.log(Math.tan(Math.toRadians(lat)) + 1 / Math.cos(Math.toRadians(lat))) / Math.PI) / 2 * (1<<zoom) ) ;

                return("" + zoom + "/" + xtile + "/" + ytile);

        }

}