StringToPeriodConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/convert/StringToPeriodConverter.java lines 40–70

final class StringToPeriodConverter implements GenericConverter {

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

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

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

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

}