public static List extractElements(Geometry geom, boolean skipEmpty) {
List elem = new ArrayList();
if (geom == null) return elem;
for (int i = 0; i < geom.getNumGeometries(); i++) {
Geometry elemGeom = geom.getGeometryN(i);
if (skipEmpty && elemGeom.isEmpty()) continue;
elem.add(elemGeom);
}
return elem;
}
public Geometry combine(Geometry orig, Geometry geom) {
List origList = extractElements(orig, true);
List geomList = extractElements(geom, true);
origList.addAll(geomList);
if (origList.size() == 0) {
// return a clone of the orig geometry
return (Geometry) orig.clone();
}
// return the "simplest possible" geometry
return geomFactory.buildGeometry(origList);
}