Method format

base/src/main/java/net/time4j/PrettyTime.java:1874–1906

(
        long amount,
        IsoUnit unit,
        boolean negative,
        TextWidth width
    )

    }

    private String format(
        long amount,
        IsoUnit unit,
        boolean negative,
        TextWidth width
    ) {
        long value = amount;

        if (negative) {
            value = MathUtils.safeNegate(amount);
        }

        if (SUPPORTED_UNITS.contains(unit)) {
            if (unit.isCalendrical()) {
                CalendarUnit u = CalendarUnit.class.cast(unit);
                return this.print(value, u, width);
            } else {
                ClockUnit u = ClockUnit.class.cast(unit);
                if (u == NANOS) {
                    if ((amount % MIO) == 0) {
                        u = MILLIS;
                        value = value / MIO;
                    } else if ((amount % 1000) == 0) {
                        u = MICROS;
                        value = value / 1000;
                    }
                }
                return this.print(value, u, width);
            }
        }

        throw new UnsupportedOperationException("Unknown unit: " + unit);
    }

    private String format(
        String pattern,