private void addToSet()

in core/src/main/java/com/jetbrains/youtrackdb/internal/core/schedule/CronExpression.java [901:1036]
120 lines of code
70 McCabe index (conditional complexity)

  private void addToSet(int val, int end, int incr, int type) throws ParseException {
    var set = getSet(type);

    if (type == SECOND || type == MINUTE) {
      if ((val < 0 || val > 59 || end > 59) && (val != ALL_SPEC_INT)) {
        throw new ParseException("Minute and Second values must be between 0 and 59", -1);
      }
    } else if (type == HOUR) {
      if ((val < 0 || val > 23 || end > 23) && (val != ALL_SPEC_INT)) {
        throw new ParseException("Hour values must be between 0 and 23", -1);
      }
    } else if (type == DAY_OF_MONTH) {
      if ((val < 1 || val > 31 || end > 31) && (val != ALL_SPEC_INT) && (val != NO_SPEC_INT)) {
        throw new ParseException("Day of month values must be between 1 and 31", -1);
      }
    } else if (type == MONTH) {
      if ((val < 1 || val > 12 || end > 12) && (val != ALL_SPEC_INT)) {
        throw new ParseException("Month values must be between 1 and 12", -1);
      }
    } else if (type == DAY_OF_WEEK) {
      if ((val == 0 || val > 7 || end > 7) && (val != ALL_SPEC_INT) && (val != NO_SPEC_INT)) {
        throw new ParseException("Day-of-Week values must be between 1 and 7", -1);
      }
    }

    if ((incr == 0 || incr == -1) && val != ALL_SPEC_INT) {
      if (val != -1) {
        set.add(val);
      } else {
        set.add(NO_SPEC);
      }

      return;
    }

    var startAt = val;
    var stopAt = end;

    if (val == ALL_SPEC_INT && incr <= 0) {
      incr = 1;
      set.add(ALL_SPEC); // put in a marker, but also fill values
    }

    if (type == SECOND || type == MINUTE) {
      if (stopAt == -1) {
        stopAt = 59;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 0;
      }
    } else if (type == HOUR) {
      if (stopAt == -1) {
        stopAt = 23;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 0;
      }
    } else if (type == DAY_OF_MONTH) {
      if (stopAt == -1) {
        stopAt = 31;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 1;
      }
    } else if (type == MONTH) {
      if (stopAt == -1) {
        stopAt = 12;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 1;
      }
    } else if (type == DAY_OF_WEEK) {
      if (stopAt == -1) {
        stopAt = 7;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 1;
      }
    } else if (type == YEAR) {
      if (stopAt == -1) {
        stopAt = MAX_YEAR;
      }
      if (startAt == -1 || startAt == ALL_SPEC_INT) {
        startAt = 1970;
      }
    }

    // if the end of the range is before the start, then we need to overflow into
    // the next day, month etc. This is done by adding the maximum amount for that
    // type, and using modulus max to determine the value being added.
    var max = -1;
    if (stopAt < startAt) {
      switch (type) {
        case SECOND:
          max = 60;
          break;
        case MINUTE:
          max = 60;
          break;
        case HOUR:
          max = 24;
          break;
        case MONTH:
          max = 12;
          break;
        case DAY_OF_WEEK:
          max = 7;
          break;
        case DAY_OF_MONTH:
          max = 31;
          break;
        case YEAR:
          throw new IllegalArgumentException("Start year must be less than stop year");
        default:
          throw new IllegalArgumentException("Unexpected type encountered");
      }
      stopAt += max;
    }

    for (var i = startAt; i <= stopAt; i += incr) {
      if (max == -1) {
        // ie: there's no max to overflow over
        set.add(i);
      } else {
        // take the modulus to get the real value
        var i2 = i % max;

        // 1-indexed ranges should not include 0, and should include their max
        if (i2 == 0 && (type == MONTH || type == DAY_OF_WEEK || type == DAY_OF_MONTH)) {
          i2 = max;
        }

        set.add(i2);
      }
    }
  }