void add(Comparator<T> comparator) {
			if (primaryComparator == null) {
				primaryComparator = comparator;
			}
			else if (nextComparator == null) {
				nextComparator = comparator;
			}
			else {
				nextComparator = new ComparatorLink(nextComparator, comparator);
			}
		}
A comparator that can be linked to other comparators to form a chain of comparators
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/AbstractSortedTableModel.java