Find holes in a polygon

Holes.java

private List<PolyDT> temp;

    private void findHoles(Geometry geometry) {
        String geometryType = geometry.getGeometryType();
        geometryType = geometryType.toUpperCase();

        if (geometryType.equals("MULTIPOLYGON")) {
            MultiPolygon multiPolygon = (MultiPolygon) geometry;
            for (int i=0; i<multiPolygon.getNumGeometries(); i++) {
                findHoles((Geometry) multiPolygon.getGeometryN(i));
            }
        } else if (geometryType.equals("POLYGON")) {
            Polygon polygon = (Polygon) geometry;
            int noOfHoles = polygon.getNumInteriorRing();



            if (noOfHoles > 0) {
                for (int j = 0; j < noOfHoles; j++) {
                    LineString hole = polygon.getInteriorRingN(j);

                    Coordinate[] coordinates = hole.getCoordinates();

                    GeometryFactory factory = new GeometryFactory();

                    //Find co-ordinate sequence from line string
                    CoordinateSequence coordinateSequence = new CoordinateArraySequence(coordinates);

                    LinearRing linearRing = factory.createLinearRing(coordinateSequence);

                    Polygon p = new Polygon(linearRing, null, factory);


                    temp.add(new PolyDT((Geometry)p, true));
                }
            }

            temp.add(new PolyDT((Geometry)polygon, false));

        } else if (geometryType.equals("LINESTRING")) {
            temp.add(new PolyDT(geometry, false));

        } else if (geometryType.equals("MULTILINESTRING")) {
            temp.add(new PolyDT(geometry, false));

        } else if (geometryType.equals("POINT")) {
            temp.add(new PolyDT(geometry, false));

        } else if (geometryType.equals("MULTIPOINT")) {
            temp.add(new PolyDT(geometry, false));

        }




    }