javax.validation.ConstraintViolation#getRootBean ( )源码实例Demo

@Override
public ErrorResponse toErrorResponse(ConstraintViolationException cve) {
	LOGGER.warn("a ConstraintViolationException occured", cve);

	List<ErrorData> errors = new ArrayList<>();
	for (ConstraintViolation<?> violation : cve.getConstraintViolations()) {

		ErrorDataBuilder builder = ErrorData.builder();
		builder = builder.addMetaField(META_TYPE_KEY, META_TYPE_VALUE);
		builder = builder.setStatus(String.valueOf(HttpStatus.UNPROCESSABLE_ENTITY_422));
		builder = builder.setDetail(violation.getMessage());

		builder = builder.setCode(toCode(violation));
		if (violation.getMessageTemplate() != null) {
			builder = builder.addMetaField(META_MESSAGE_TEMPLATE, violation.getMessageTemplate());
		}

		// for now we just provide root resource validation information
		// depending on bulk update spec, we might also provide the leaf information in the future
		if (violation.getRootBean() != null) {
			ResourceRef resourceRef = resolvePath(violation);
			builder = builder.addMetaField(META_RESOURCE_ID, resourceRef.getRootResourceId());
			builder = builder.addMetaField(META_RESOURCE_TYPE, resourceRef.getRootResourceType());
			builder = builder.setSourcePointer(resourceRef.getRootSourcePointer());
		}

		ErrorData error = builder.build();
		errors.add(error);
	}

	return ErrorResponse.builder().setStatus(HttpStatus.UNPROCESSABLE_ENTITY_422).setErrorData(errors).build();
}
 

/**
 * Translate validated bean and root path into validated resource and
 * resource path. For example, embeddables belonging to an entity document
 * are mapped back to an entity violation and a proper path to the
 * embeddable attribute.
 *
 * @param violation to compute the reference
 * @return computaed reference
 */
private ResourceRef resolvePath(ConstraintViolation<?> violation) {
	Object resource = violation.getRootBean();

	Object nodeObject = resource;
	ResourceRef ref = new ResourceRef(resource);

	Iterator<Node> iterator = violation.getPropertyPath().iterator();
	while (iterator.hasNext()) {
		Node node = iterator.next();

		// ignore methods/parameters
		if (node.getKind() == ElementKind.METHOD) {
			continue;
		}
		if (node.getKind() == ElementKind.PARAMETER) {
			resource = getParameterValue(node);
			nodeObject = resource;
			ref = new ResourceRef(resource);
			assertResource(resource);
			continue;
		}

		// visit list, set, map references
		nodeObject = ref.getNodeReference(nodeObject, node);
		ref.visitNode(nodeObject);

		// visit property
		nodeObject = ref.visitProperty(nodeObject, node);
	}

	return ref;
}