public Object getValueAt(int row, int col)
    {
      if (col == 0)
        return String.valueOf(row);
      else if (col == 1) {
        int lockOwner = resources.get(row).getLockOwner();
        if (lockOwner == Resource.NOT_LOCKED)
          return "None";
        else
          return lockOwner;
      }
      else
        return "";
    }