notempty enum java code example

Example: annotation for enum hibernate validator

public class CustomerTypeSubSetValidator implements ConstraintValidator<CustomerTypeSubset, CustomerType> {
    private CustomerType[] subset;
 
    @Override
    public void initialize(CustomerTypeSubset constraint) {
        this.subset = constraint.anyOf();
    }
 
    @Override
    public boolean isValid(CustomerType value, ConstraintValidatorContext context) {
        return value == null || Arrays.asList(subset).contains(value);
    }
}