public static long parseDuration()

in scripts/src/main/java/com/gu/typesafe/config/impl/SimpleConfig.java [726:783]
48 lines of code
24 McCabe index (conditional complexity)

    public static long parseDuration(String input,
                                     com.gu.typesafe.config.ConfigOrigin originForException, String pathForException) {
        String s = ConfigImplUtil.unicodeTrim(input);
        String originalUnitString = getUnits(s);
        String unitString = originalUnitString;
        String numberString = ConfigImplUtil.unicodeTrim(s.substring(0, s.length()
                - unitString.length()));
        TimeUnit units = null;

        // this would be caught later anyway, but the error message
        // is more helpful if we check it here.
        if (numberString.length() == 0)
            throw new com.gu.typesafe.config.ConfigException.BadValue(originForException,
                    pathForException, "No number in duration value '" + input
                            + "'");

        if (unitString.length() > 2 && !unitString.endsWith("s"))
            unitString = unitString + "s";

        // note that this is deliberately case-sensitive
        if (unitString.equals("") || unitString.equals("ms") || unitString.equals("millis")
                || unitString.equals("milliseconds")) {
            units = TimeUnit.MILLISECONDS;
        } else if (unitString.equals("us") || unitString.equals("micros") || unitString.equals("microseconds")) {
            units = TimeUnit.MICROSECONDS;
        } else if (unitString.equals("ns") || unitString.equals("nanos") || unitString.equals("nanoseconds")) {
            units = TimeUnit.NANOSECONDS;
        } else if (unitString.equals("d") || unitString.equals("days")) {
            units = TimeUnit.DAYS;
        } else if (unitString.equals("h") || unitString.equals("hours")) {
            units = TimeUnit.HOURS;
        } else if (unitString.equals("s") || unitString.equals("seconds")) {
            units = TimeUnit.SECONDS;
        } else if (unitString.equals("m") || unitString.equals("minutes")) {
            units = TimeUnit.MINUTES;
        } else {
            throw new com.gu.typesafe.config.ConfigException.BadValue(originForException,
                    pathForException, "Could not parse time unit '"
                            + originalUnitString
                            + "' (try ns, us, ms, s, m, h, d)");
        }

        try {
            // if the string is purely digits, parse as an integer to avoid
            // possible precision loss;
            // otherwise as a double.
            if (numberString.matches("[+-]?[0-9]+")) {
                return units.toNanos(Long.parseLong(numberString));
            } else {
                long nanosInUnit = units.toNanos(1);
                return (long) (Double.parseDouble(numberString) * nanosInUnit);
            }
        } catch (NumberFormatException e) {
            throw new com.gu.typesafe.config.ConfigException.BadValue(originForException,
                    pathForException, "Could not parse duration number '"
                            + numberString + "'");
        }
    }