@Override public <T extends CatalogInfo> CloseableIterator<T> list( final Class<T> of, final Filter filter, @Nullable Integer offset, @Nullable Integer count, @Nullable SortBy sortOrder) { SortBy[] sortOrderList = null; if (sortOrder != null) { sortOrderList = new SortBy[] {sortOrder}; } return list(of, filter, offset, count, sortOrderList); }