public void tableChanged(TableModelEvent e)
		{
			// If we're not sorting by anything, just pass the event along.
			if (!isSorting())
			{
				clearSortingState();
				fireTableChanged(e);
				return;
			}

			// If the table structure has changed, cancel the sorting; the
			// sorting columns may have been either moved or deleted from
			// the model.
			if (e.getFirstRow() == TableModelEvent.HEADER_ROW)
			{
				cancelSorting();
				fireTableChanged(e);
				return;
			}

			// We can map a cell event through to the view without widening
			// when the following conditions apply:
			// 
			// a) all the changes are on one row (e.getFirstRow() == e.getLastRow()) and,
			// b) all the changes are in one column (column != TableModelEvent.ALL_COLUMNS) and,
			// c) we are not sorting on that column (getSortingStatus(column) == NOT_SORTED) and,
			// d) a reverse lookup will not trigger a sort (modelToView != null)
			//
			// Note: INSERT and DELETE events fail this test as they have column == ALL_COLUMNS.
			// 
			// The last check, for (modelToView != null) is to see if modelToView
			// is already allocated. If we don't do this check; sorting can become
			// a performance bottleneck for applications where cells
			// change rapidly in different parts of the table. If cells
			// change alternately in the sorting column and then outside of
			// it this class can end up re-sorting on alternate cell updates -
			// which can be a performance problem for large tables. The last
			// clause avoids this problem.
			int column = e.getColumn();
			if (e.getFirstRow() == e.getLastRow()
					&& column != TableModelEvent.ALL_COLUMNS
					&& getSortingStatus(column) == NOT_SORTED
					&& modelToView != null)
			{
				int viewIndex = getModelToView()[e.getFirstRow()];
				fireTableChanged(new TableModelEvent(TableSortModel.this,
						viewIndex, viewIndex, column, e.getType()));
				return;
			}

			// Something has happened to the data that may have invalidated the row order.
			clearSortingState();
			fireTableDataChanged();
		}