如何使用hibernate验证器检查Enum中可用值

public enum Role {
    ADMIN,
    USER
}

import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;

@Entity
public class User {
    // other fields and annotations
    
    @Enumerated(EnumType.STRING)
    private Role role;
    
    // getters and setters
}

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class RoleValidator implements ConstraintValidator<ValidRole, Role> {
    
    @Override
    public void initialize(ValidRole constraintAnnotation) {
        // initialization, if needed
    }
    
    @Override
    public boolean isValid(Role value, ConstraintValidatorContext context) {
        if (value == null) {
            return false; // null value is invalid
        }
        
        for (Role role : Role.values()) {
            if (role == value) {
                return true; // valid role value
            }
        }
        
        return false; // invalid role value
    }
}

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = RoleValidator.class)
public @interface ValidRole {
    String message() default "Invalid role";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}