@Override
  public void setFocusCell(Object element, int column) {
    final ViewerCell oldCell = getFocusCell();
    if (oldCell != null
        && (column == oldCell.getColumnIndex())
        && (element == oldCell.getElement())) return;
    final ColumnViewer viewer = getViewer();
    final TableItem item = (TableItem) viewer.findItem(element);
    if (item == null) return;
    final ViewerRow row = viewer.getViewerRowFromItem(item);

    final ViewerCell cell = row.getCell(column);
    if (cell == null) return;
    setFocusCell(cell);
  }
 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.jface.viewers.IA#updateFocusCell()
  */
 @Override
 public void updateFocusCell() {
   final ViewerCell cell = getFocusCell();
   if (cell == null || cell.getViewerRow() == null) return;
   cell.update(
       cell.getViewerRow(),
       cell.getColumnIndex(),
       ((TableItem) cell.getViewerRow().getItem()).getData());
 }
  @Override
  protected void doUpdateItem(Widget widget, Object element, boolean fullMap) {
    boolean oldBusy = isBusy();
    setBusy(true);
    try {
      if (widget instanceof Item) {
        final Item item = (Item) widget;

        // remember element we are showing
        if (fullMap) {
          associate(element, item);
        } else {
          Object data = item.getData();
          if (data != null) {
            unmapElement(data, item);
          }
          item.setData(element);
          mapElement(element, item);
        }

        int columnCount = doGetColumnCount();
        if (columnCount == 0) columnCount = 1; // If there are no columns do the first one

        ViewerRow viewerRowFromItem = getViewerRowFromItem(item);

        boolean isVirtual = (getControl().getStyle() & SWT.VIRTUAL) != 0;

        // If the control is virtual, we cannot use the cached viewer row object. See bug 188663.
        if (isVirtual) {
          viewerRowFromItem = (ViewerRow) viewerRowFromItem.clone();
        }

        // Also enter loop if no columns added. See 1G9WWGZ: JFUIF:WINNT -
        // TableViewer with 0 columns does not work
        for (int column = 0; column < columnCount || column == 0; column++) {
          ViewerColumn columnViewer = getViewerColumn(column);
          ViewerCell cellToUpdate = updateCell(viewerRowFromItem, column, element);

          // If the control is virtual, we cannot use the cached cell object. See bug 188663.
          if (isVirtual) {
            cellToUpdate =
                new ViewerCell(cellToUpdate.getViewerRow(), cellToUpdate.getColumnIndex(), element);
          }

          columnViewer.refresh(cellToUpdate);

          // clear cell (see bug 201280)
          updateCell(null, 0, null);

          // As it is possible for user code to run the event
          // loop check here.
          if (item.isDisposed()) {
            unmapElement(element, item);
            return;
          }
        }
      }
    } finally {
      setBusy(oldBusy);
    }
  }