public Class<?> getColumnClass(int columnIndex)
  {
    switch (columnIndex)
    {
      case COL_HASH:
      case COL_TITLE:
      case COL_LINK:
      case COL_SOURCE:
        return String.class;

      case COL_SEED:
      case COL_LEECH:
        return Integer.class;

      default:
        return String.class;
    }
  }