DelimitedStringToArrayConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/convert/DelimitedStringToArrayConverter.java lines 36–82

final class DelimitedStringToArrayConverter implements ConditionalGenericConverter {

	private final ConversionService conversionService;

	DelimitedStringToArrayConverter(ConversionService conversionService) {
		Assert.notNull(conversionService, "'conversionService' must not be null");
		this.conversionService = conversionService;
	}

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

	@Override
	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
		return targetType.getElementTypeDescriptor() == null
				|| this.conversionService.canConvert(sourceType, targetType.getElementTypeDescriptor());
	}

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

	private Object convert(String source, TypeDescriptor sourceType, TypeDescriptor targetType) {
		Delimiter delimiter = targetType.getAnnotation(Delimiter.class);
		String[] elements = getElements(source, (delimiter != null) ? delimiter.value() : ",");
		TypeDescriptor elementDescriptor = targetType.getElementTypeDescriptor();
		Assert.state(elementDescriptor != null, "elementDescriptor is missing");
		Object target = Array.newInstance(elementDescriptor.getType(), elements.length);
		for (int i = 0; i < elements.length; i++) {
			String sourceElement = elements[i];
			Object targetElement = this.conversionService.convert(sourceElement.trim(), sourceType, elementDescriptor);
			Array.set(target, i, targetElement);
		}
		return target;
	}

	private String[] getElements(String source, String delimiter) {
		return StringUtils.delimitedListToStringArray(source, Delimiter.NONE.equals(delimiter) ? null : delimiter);
	}

}