private Polygon editPolygon(Polygon polygon, GeometryEditorOperation operation) { Polygon newPolygon = (Polygon) operation.edit(polygon, factory); // create one if needed if (newPolygon == null) newPolygon = factory.createPolygon((CoordinateSequence) null); if (newPolygon.isEmpty()) { // RemoveSelectedPlugIn relies on this behaviour. [Jon Aquino] return newPolygon; } LinearRing shell = (LinearRing) edit(newPolygon.getExteriorRing(), operation); if (shell == null || shell.isEmpty()) { // RemoveSelectedPlugIn relies on this behaviour. [Jon Aquino] return factory.createPolygon(null, null); } ArrayList holes = new ArrayList(); for (int i = 0; i < newPolygon.getNumInteriorRing(); i++) { LinearRing hole = (LinearRing) edit(newPolygon.getInteriorRingN(i), operation); if (hole == null || hole.isEmpty()) { continue; } holes.add(hole); } return factory.createPolygon(shell, (LinearRing[]) holes.toArray(new LinearRing[] {})); }