Method AddDistinctValue

storage/connect/tabdos.cpp:2884–2924

/ AddDistinctValue: Check whether this value already exist in the */ list and if not add it to the distinct values list. */ /

/*  list and if not add it to the distinct values list.                */
/***********************************************************************/
bool DOSCOL::AddDistinctValue(PGLOBAL g)
  {
  bool found = false;
  int  i, m, n;

  ReadColumn(g);           // Extract column value from current line

  // Perhaps a better algorithm can be used when Ndv gets bigger
  // Here we cannot use Find because we must get the index of where
  // to insert a new value if it is not found in the array.
  for (n = 0; n < Ndv; n++) {
    m = Dval->CompVal(Value, n);

    if (m > 0)
      continue;
    else if (!m)
      found = true;        // Already there

    break;
    } // endfor n

  if (!found) {
    // Check whether we have room for an additional value
    if (Ndv == Freq) {
      // Too many values because of wrong Freq setting
      snprintf(g->Message, sizeof(g->Message), MSG(BAD_FREQ_SET), Name);
      return true;
      } // endif Ndv

    // New value, add it to the list before the nth value
    Dval->SetNval(Ndv + 1);

    for (i = Ndv; i > n; i--)
      Dval->Move(i - 1, i);

    Dval->SetValue(Value, n);
    Ndv++;
    } // endif found

  return false;
  } // end of AddDistinctValue

/* ------------------------------------------------------------------- */