public OGCPoint getPoint(DeferredObject[] args) {
    OGCGeometry geometry = getGeometry(args);

    if (geometry instanceof OGCPoint) {
      return (OGCPoint) geometry;
    } else {
      return null;
    }
  }
Reads the corresponding geometry from the deferred object list
or returns the cached geometry if argument is constant.

@param args
@return OGCPoint or null if not a point
@see #getGeometry(DeferredObject[])
ql/src/java/org/apache/hadoop/hive/ql/udf/esri/HiveGeometryOIHelper.java