/**
  * Returns row index of a row in the sheet that contains this cell
  *
  * @return zero-based row index of a row in the sheet that contains this cell
  */
 public int getRowIndex() {
   return _row.getRowNum();
 }
 /**
  * Returns the sheet this cell belongs to
  *
  * @return the sheet this cell belongs to
  */
 public Sheet getSheet() {
   return _row.getSheet();
 }
 /**
  * Returns column index of this cell
  *
  * @return zero-based column index of a column in a sheet.
  */
 public int getColumnIndex() {
   return _row.getCellIndex(this);
 }