Unit Type — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/convert/DurationStyle.java lines 179–261

	enum Unit {

		/**
		 * Nanoseconds.
		 */
		NANOS(ChronoUnit.NANOS, "ns", Duration::toNanos),

		/**
		 * Microseconds.
		 */
		MICROS(ChronoUnit.MICROS, "us", (duration) -> duration.toNanos() / 1000L),

		/**
		 * Milliseconds.
		 */
		MILLIS(ChronoUnit.MILLIS, "ms", Duration::toMillis),

		/**
		 * Seconds.
		 */
		SECONDS(ChronoUnit.SECONDS, "s", Duration::getSeconds),

		/**
		 * Minutes.
		 */
		MINUTES(ChronoUnit.MINUTES, "m", Duration::toMinutes),

		/**
		 * Hours.
		 */
		HOURS(ChronoUnit.HOURS, "h", Duration::toHours),

		/**
		 * Days.
		 */
		DAYS(ChronoUnit.DAYS, "d", Duration::toDays);

		private final ChronoUnit chronoUnit;

		private final String suffix;

		private final Function<Duration, Long> longValue;

		Unit(ChronoUnit chronoUnit, String suffix, Function<Duration, Long> toUnit) {
			this.chronoUnit = chronoUnit;
			this.suffix = suffix;
			this.longValue = toUnit;
		}

		public Duration parse(String value) {
			return Duration.of(Long.parseLong(value), this.chronoUnit);
		}

		public String print(Duration value) {
			return longValue(value) + this.suffix;
		}

		public long longValue(Duration value) {
			return this.longValue.apply(value);
		}

		public static Unit fromChronoUnit(@Nullable ChronoUnit chronoUnit) {
			if (chronoUnit == null) {
				return Unit.MILLIS;
			}
			for (Unit candidate : values()) {
				if (candidate.chronoUnit == chronoUnit) {
					return candidate;
				}
			}
			throw new IllegalArgumentException("Unknown unit " + chronoUnit);
		}

		public static Unit fromSuffix(String suffix) {
			for (Unit candidate : values()) {
				if (candidate.suffix.equalsIgnoreCase(suffix)) {
					return candidate;
				}
			}
			throw new IllegalArgumentException("Unknown unit '" + suffix + "'");
		}

	}