I receive list of domain object ids deserialized from JSON client request body:
@JsonProperty("workgroups")
private List<WorkgroupId> workgroupIds = new ArrayList<>();
I need to validate these ids in org.springframework.validation.Validator.
for (WorkgroupId workgroupId : project.getWorkgroupIds()) {
if (!domainObjectTools.doesWorkgroupExist(workgroupId)) {
// reject this invalid value here...
}
}
Question
How to reject invalid value in org.springframework.validation.Errors?
Validator interface:
@Target({ ElementType.FIELD, ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = { CustomValidatorValidator.class })
@Documented
public @interface CustomValidator{
String message() default "Put here your default message";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
ValidatorImplementation:
public final class CustomValidatorValidator implements ConstraintValidator<CustomValidator, List<WorkgroupId>> {
@Override
public void initialize(CustomValidator constraintAnnotation) {
}
@Override
public boolean isValid(List<WorkgroupId> yourlist, ConstraintValidatorContext context) {
if (yourlist== null)
return true;
else
return yourlist.stream().anyMatch(s -> /* filter here as you want */);
}
}
Notice we return true if the field is null, I do it like this because I just put @NotNull constraint if I need not to be null so I have more control over the constraint.
Finally:
@JsonProperty("workgroups")
@CustomValidator
private List<WorkgroupId> workgroupIds = new ArrayList<>();
P.S: I don't understand why you initialize the list in this last code. If that's a field you're supposed to receive through the request then you don't need to initialize it, the json deserializer will initialize it with the incoming field in the json.
You can use reject() and/or rejectValue() along with the field/error code/defaultMessage or along with a custom validator to reject the values.
