code: SortPropertyOrder convert2SortPropertyOrder(final SortOrder order) {
  		switch (order) {
  		case ASCENDING:
  			return SortPropertyOrder.ASCENDING;
  		case DESCENDING:
  			return SortPropertyOrder.DESCENDING;
  		default:
  			throw new IllegalArgumentException("Unknown SortOrder: " + order);
  		}
  	}
docs: Converts PrimeFaces SortOrder to DC SortPropertyOrder.
  
  @param order
  @return converted SortOrder
  @throws IllegalArgumentException
  if no conversion possible