static Class primitiveToBoxedType(Class type) {
  if (type == boolean.class) return Boolean;
  if (type == int.class) return Integer;
  if (type == long.class) return Long;
  if (type == float.class) return Float;
  if (type == short.class) return Short;
  if (type == char.class) return Character;
  if (type == byte.class) return Byte;
  if (type == double.class) return Double;
  null;
}