private final Column<T, C> column;
private SortDirection sortDirection = SortDirection.NONE;
private int sortIndex = -1;
public SortableHeader(SortableHeaderGroup sortableHeaderGroup, String text, Column<T, C> column) {
super(new ClickableTextCell());
this.sortableHeaderGroup = sortableHeaderGroup;
this.text = text;
this.column = column;
setUpdater(new ValueUpdater<String>() {
public void update(String s) {