I've created a composite annotation that consists of @Digits and @Min
@Digits(integer=12, fraction=0)
@Min(value=0)
@ReportAsSingleViolation
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target( { FIELD, METHOD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Constraint(validatedBy={})
public @interface PositiveInt {
String message() default "{positive.int.msg}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
my problem is, I want to reuse this annotation where I want the @Digits 'integer' value to be specify when the PositiveInteger is use
example
public Demo{
@PositiveInteger(integer=1)
private Integer num1;
@PositiveInteger(integer=2)
private Integer num2;
}
where num1 can be 1-9, and num2 can be 1-99.
Is this even possible, if so, how do I go about this?
Currently, I have to provides a custom ConstraintValidator where i would have my validation code for the @Digits and @Min
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target( { FIELD, ANNOTATION_TYPE, PARAMETER })
@Constraint(validatedBy=PositiveIntConstraintValidator.class)
public @interface PositiveInt {
String message() default "positive.int.msg";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
int integer() default 1;
}
public class PositiveIntConstraintValidator implements ConstraintValidator<PositiveInt, Number> {
private int maxDigits;
@Override
public void initialize(PositiveInt constraintAnnotation) {
maxDigits = constraintAnnotation.integer();
if (maxDigits < 1){
throw new IllegalArgumentException("Invalid max size. Max size must be a positive integer greater than 1");
}
}
@Override
public boolean isValid(Number value, ConstraintValidatorContext context) {
if (value == null){
return true;
}
else if (value instanceof Long || value instanceof Integer || value instanceof Short || value instanceof BigInteger){
String regex = "\\d{"0," + maxDigits + "}";
return Pattern.matches(regex, value.toString());
}
return false;
}
You could make use of @OverridesAnnotation:
@Digits(integer=0, fraction=0)
@Min(value=0)
@ReportAsSingleViolation
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target( { FIELD, METHOD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Constraint(validatedBy={})
public @interface PositiveInteger {
String message() default "{positive.int.msg}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
@OverridesAttribute(constraint=Digits.class, name="integer")
int digits();
}
That way the value given in @PositiveInteger#digits()
will be propagated to @Digits
.
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