protected void addToSet()

in spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-schedulerx/src/main/java/com/alibaba/cloud/scheduling/schedulerx/util/CronExpression.java [773:929]
140 lines of code
70 McCabe index (conditional complexity)

	protected void addToSet(final int val, final int end, int incr, final int type)
			throws ParseException {

		final TreeSet<Integer> 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;
		}

		int startAt = val;
		int 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.
		int 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 (int 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
				int 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);
			}
		}
	}