StringToDurationConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/convert/StringToDurationConverter.java lines 39–69

final class StringToDurationConverter implements GenericConverter {

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

	@Override
	public @Nullable Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
		if (ObjectUtils.isEmpty(source)) {
			return null;
		}
		return convert(source.toString(), getStyle(targetType), getDurationUnit(targetType));
	}

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

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

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

}