protected void cancelSorting() {
    sortingColumns.clear();
    sortingStatusChanged();
  }
CTableSorter is a decorator for TableModels; adding sorting functionality to a supplied
TableModel. CTableSorter does not store or copy the data in its TableModel; instead it maintains
a map from the row indexes of the view to the row indexes of the model. As requests are made of
the sorter (like getValueAt(row, col)) they are passed to the underlying model after the row
numbers have been translated via the internal mapping array. This way, the CTableSorter appears
to hold another copy of the table with the rows in a different order.

<p>CTableSorter registers itself as a listener to the underlying model, just as the JTable itself
would. Events received from the model are examined, sometimes manipulated (typically widened),
and then passed on to the CTableSorter's listeners (typically the JTable). If a change to the
model has invalidated the order of CTableSorter's rows, a note of this is made and the sorter
will resort the rows the next time a value is requested.

<p>When the tableHeader property is set, either by using the setTableHeader() method or the two
argument constructor, the table header may be used as a complete UI for CTableSorter. The default
renderer of the tableHeader is decorated with a renderer that indicates the sorting status of
each column. In addition, a mouse listener is installed with the following behavior:

<ul>
  <li>Mouse-click: Clears the sorting status of all other columns and advances the sorting status
      of that column through three values: {NOT_SORTED, ASCENDING, DESCENDING} (then back to
      NOT_SORTED again).
  <li>SHIFT-mouse-click: Clears the sorting status of all other columns and cycles the sorting
      status of the column through the same three values, in the opposite order: {NOT_SORTED,
      DESCENDING, ASCENDING}.
  <li>CONTROL-mouse-click and CONTROL-SHIFT-mouse-click: as above except that the changes to the
      column do not cancel the statuses of columns that are already sorting - giving a way to
      initiate a compound sort.
</ul>

<p>This is a long overdue rewrite of a class of the same name that first appeared in the swing
table demos in 1997.

@author Philip Milne
@author Brendon McLean
@author Dan van Enckevort
@author Parwinder Sekhon
@version 2.0 02/27/04 @Deprecated CTableSorter should not be used anymore since standard classes,
    e.g. TableRowSorter, from the JDK replace this functionality in a much cleaner way.
java/zylib/src/main/java/com/google/security/zynamics/zylib/gui/tables/CTableSorter.java