Coercer Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/info/GitProperties.java lines 133–163

	private record Coercer(Function<String, @Nullable Long> action, Predicate<RuntimeException> ignoredExceptions) {

		/**
		 * Attempt to convert the specified value to epoch time.
		 * @param value the value to coerce to
		 * @return the epoch time in milliseconds or {@code null}
		 */
		@Nullable String apply(String value) {
			try {
				Long result = this.action.apply(value);
				return (result != null) ? String.valueOf(result) : null;
			}
			catch (RuntimeException ex) {
				if (this.ignoredExceptions.test(ex)) {
					return null;
				}
				throw ex;
			}
		}

		static Coercer milliseconds() {
			return new Coercer((value) -> Long.parseLong(value) * 1000, NumberFormatException.class::isInstance);
		}

		static Coercer dateTimePattern(String pattern) {
			return new Coercer(
					(value) -> DateTimeFormatter.ofPattern(pattern).parse(value, Instant::from).toEpochMilli(),
					DateTimeParseException.class::isInstance);
		}

	}