Method parseTimeSymbol

base/src/main/java/net/time4j/Duration.java:3811–3829

(
        char c,
        String period,
        int index
    )

    }

    private static ClockUnit parseTimeSymbol(
        char c,
        String period,
        int index
    ) throws ParseException {

        switch (c) {
            case 'H':
                return HOURS;
            case 'M':
                return MINUTES;
            case 'S':
                return SECONDS;
            default:
                throw new ParseException(
                    "Symbol \'" + c + "\' not supported: " + period, index);
        }

    }

    private static IsoDateUnit parseWeekBasedSymbol(
        char c,