Spring Custom Annotation Story - Qiita
I saw the above website.
I understand that Constraint Annotation has a fixed model (message(), groups(), and payload(), but is it possible to add a condition for setting full-width alphanumeric characters to error to the class below?
Annotation to limit the maximum length by separating half and full-width characters
It says so, but I don't know which code is used to limit it.
Please let me know.
@Target({FIELD})
@Retention (RUNTIME)
@ Documented
@Constraint(validatedBy={CustomSizeValidator.class})
public@interfaceCustomSize{
String message() default "{validation.CustomSize.message}";
Class <?> [ ] groups() default { };
Class <?extends Payload > [ ] payload() default { };
int max();
@Target ({FIELD})
@Retention (RUNTIME)
@ Documented
@ interface List {
CustomSize [] value();
}
}
The referenced linked code implements validation in the CustomSizeValidator class isValid method
@Override
public boolean isValid(String value, ConstraintValidatorContext){
// CustomSizeUtil is a class that describes only check logic
// getLength return value is int
return CustomSizeUtil.getLength(value)<=max;
}
Yes.
In this method, the string passed by the argument is
Full-width lowercase letters
You can achieve this by implementing to return false if contains .
In addition, the linked code is
Count half-width and full-width separately
This is what we call the CustomSizeUtil.getLength(value) method.
(I can't really imagine the behavior from Japanese.)
@Override
public void initialize (CustomSize customSize) {
max = customSize.max();
}
Then, I haven't read the isValid method, but why does the above code correspond to initializing the isValid method?
This validation is based on implementing the Bean Validation specification, and the answer to the above question is "This specification. In fact, the initialize and isValid methods are invoked by the framework.
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