public String toString() {

      StringBuilder buffer = new StringBuilder("{");

      int[] intdata = data;
      boolean first = true;

      for (int i = colValuesInternal.size() - 1; i >= 0; i--) {
        int[] index = colValuesInternal.get(i);

        if ((intdata[index[0]] & index[1]) != 0) {
          if (first) {
            first = false;
          }
          else {
            buffer.append(",");
          }
          buffer.append(colValuesInternal.getKey(i));
        }
      }

      buffer.append("}");

      return buffer.toString();
    }
public String toString()