Part Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/logging/CorrelationIdFormatter.java lines 170–200

	record Part(String name, int length) {

		private static final Pattern pattern = Pattern.compile("^(.+?)\\((\\d+)\\)$");

		String resolve(UnaryOperator<@Nullable String> resolver) {
			String resolved = resolver.apply(name());
			if (resolved == null) {
				return blank();
			}
			int padding = length() - resolved.length();
			return (padding <= 0) ? resolved : resolved + " ".repeat(padding);
		}

		String blank() {
			return " ".repeat(this.length);
		}

		@Override
		public String toString() {
			return "%s(%s)".formatted(name(), length());
		}

		static Part of(String part) {
			Matcher matcher = pattern.matcher(part.trim());
			Assert.state(matcher.matches(), () -> "Invalid specification part '%s'".formatted(part));
			String name = matcher.group(1);
			int length = Integer.parseInt(matcher.group(2));
			return new Part(name, length);
		}

	}