DurationToStringConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/convert/DurationToStringConverter.java lines 37–67

final class DurationToStringConverter implements GenericConverter {

	@Override
	public Set<ConvertiblePair> getConvertibleTypes() {
		return Collections.singleton(new ConvertiblePair(Duration.class, String.class));
	}

	@Override
	public @Nullable Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
		if (source == null) {
			return null;
		}
		return convert((Duration) source, getDurationStyle(sourceType), getDurationUnit(sourceType));
	}

	private @Nullable ChronoUnit getDurationUnit(TypeDescriptor sourceType) {
		DurationUnit annotation = sourceType.getAnnotation(DurationUnit.class);
		return (annotation != null) ? annotation.value() : null;
	}

	private @Nullable DurationStyle getDurationStyle(TypeDescriptor sourceType) {
		DurationFormat annotation = sourceType.getAnnotation(DurationFormat.class);
		return (annotation != null) ? annotation.value() : null;
	}

	private String convert(Duration source, @Nullable DurationStyle style, @Nullable ChronoUnit unit) {
		style = (style != null) ? style : DurationStyle.ISO8601;
		return style.print(source, unit);
	}

}