public SearchParameters orderBy(final String fieldName, final OrderByDirection direction) {
   addOrderBy(fieldName, direction);
   return this;
 }
 public SearchParameters orderBy(
     final SingularAttribute<? extends Persistable, ? extends Serializable> attribute,
     final OrderByDirection direction) {
   addOrderBy(attribute, direction);
   return this;
 }
 public SearchParameters orderBy(final String fieldName) {
   addOrderBy(fieldName);
   return this;
 }
 public SearchParameters orderBy(final OrderBy orderBy) {
   addOrderBy(orderBy);
   return this;
 }