cdm/src/main/java/ucar/nc2/ft2/simpgeometry/CFPolygon.java
public void setPrev(Polygon prev) {
		
		if(prev instanceof CFPolygon) {
			setPrev((CFPolygon) prev);
		}
		
		else this.prev = prev;
	}
public void setPrev(Polygon prev) {
		
		if(prev instanceof CFPolygon) {
			setPrev((CFPolygon) prev);
		}
		
		else this.prev = prev;
	}
Sets the previous polygon which makes up the multipolygon which this polygon is a part of.
If prev is a CFPolygon, automatically connect the other polygon to this polygon as well.