public void startCell(ICellContent cell) throws BirtException {
    if (cellEmitter != null) {
      cellEmitter.startCell(cell);
    } else {
      if (!isNestTable()) {
        BufferedReportEmitter buffer = null;
        int colId = cell.getColumn();
        int colSpan = cell.getColSpan();
        int rowSpan = cell.getRowSpan();

        // the current executed cell is rowIndex, columnIndex
        // get the span value of that cell.
        if (cell.getGenerateBy() instanceof CellDesign) {
          CellDesign cellDesign = (CellDesign) cell.getGenerateBy();
          if (cellDesign != null) {
            String dropType = cellDesign.getDrop();
            if (dropType != null && !"none".equals(dropType)) // $NON-NLS-1$
            {
              rowSpan = createDropID(getGroupLevel(), dropType);
            }
          }
        }

        // the table has no cache, the cell is the first drop or spanned cell
        if (!hasDropCell() && (rowSpan < 0 || rowSpan > 1)) {
          layoutEvents.push(
              new LayoutEvent(
                  LayoutEvent.ON_FIRST_DROP_CELL, new StartInfo(layout.getRowCount() - 1, colId)));
        }
        if (hasDropCell() || rowSpan < 0 || rowSpan > 1) {
          buffer = new BufferedReportEmitter(emitter);
          cellEmitter = buffer;
        }
        // we need cache the cell
        createCell(colId, rowSpan, colSpan, new CellContent(cell, buffer));
        if (hasDropCell()) {
          return;
        }
        // TODO: changes the column id and output it.
        emitter.startCell(layout.getWrappedCellContent(cell));
      } else {
        emitter.startCell(cell);
      }
    }
  }
  protected void flushRow(int rowId, int colId, boolean withStart) throws BirtException {
    int colCount = layout.getColCount();
    int columnId = layout.getColumnId(colId);
    Row row = layout.getRow(rowId);
    IRowContent rowContent = (IRowContent) row.getContent();
    if (withStart) {
      emitter.startRow(rowContent);
    }
    for (int j = columnId; j < colCount; j++) {
      Cell cell = row.getCell(j);
      if (cell.getStatus() == Cell.CELL_USED) {
        CellContent content = (CellContent) cell.getContent();
        CellContentWrapper tempCell = new CellContentWrapper(content.cell);
        tempCell.setColumn(cell.getColId());
        tempCell.setRowSpan(cell.getRowSpan());
        tempCell.setColSpan(cell.getColSpan());

        emitter.startCell(tempCell);
        if (content.buffer != null) {
          content.buffer.flush();
        }
        emitter.endCell(tempCell);
      }
      if (cell.getStatus() == Cell.CELL_EMPTY) {
        IReportContent report = rowContent.getReportContent();
        ICellContent cellContent = report.createCellContent();
        cellContent.setParent(rowContent);
        cellContent.setColumn(cell.getColId() + 1);
        cellContent.setRowSpan(cell.getRowSpan());
        cellContent.setColSpan(cell.getColSpan());
        emitter.startCell(cellContent);
        emitter.endCell(cellContent);
      }
    }
    emitter.endRow(rowContent);
  }