How to write OR condition in xml constraints

reddyvenkatp · **Joined:** Tue Jul 24, 2012 2:39 pm **Posts:** 10

Hi, I want to know how can I write OR condition in Constraint XML.

<constraint annotation="org.hibernate.validator.constraints.Length">
<element name="max">30</element>
</constraint>

(OR)
<constraint annotation="javax.validation.constraints.Pattern">
<element name="regexp">\x28\d{3}?\x29\x20\d{3}?\x2D\d{4}?</element>
</constraint>

Please let me know.

Thanks.

Gunnar · **Joined:** Sat Jan 24, 2009 12:46 pm **Posts:** 388

AFAICS that's not really possible. You could create a custom constraint using the boolean constraint composition feature of Hibernate Validator (see http://docs.jboss.org/hibernate/stable/validator/reference/en-US/html/validator-specifics.html#d0e3701) and assign that via XML:

Code:

@ConstraintComposition(OR)
@Pattern(regexp = "\x28\d{3}?\x29\x20\d{3}?\x2D\d{4}?")
@Length(max = 30)
@ReportAsSingleViolation
@Target({ METHOD, FIELD })
@Retention(RUNTIME)
@Constraint(validatedBy = { })
public @interface PatternOrSize {
   String message() default "{PatternOrSize.message}";
   Class<?>[] groups() default { };
   Class<? extends Payload>[] payload() default { };
}

...

<constraint annotation="com.mycompany.PatternOrSize"/>

If you want to have the length and regexp configurable for the composed constraint, you can use attribute overrides (see http://beanvalidation.org/1.1/spec/#constraintsdefinitionimplementation-constraintcomposition) like this:

Code:

@ConstraintComposition(OR)
@Pattern(regexp = "\x28\d{3}?\x29\x20\d{3}?\x2D\d{4}?")
@Length(max = 30)
@ReportAsSingleViolation
@Target({ METHOD, FIELD })
@Retention(RUNTIME)
@Constraint(validatedBy = { })
public @interface PatternOrSize {
   String message() default "{PatternOrSize.message}";
   Class<?>[] groups() default { };
   Class<? extends Payload>[] payload() default { };
   
   @OverridesAttribute(constraint=Length.class, name="max")
   int max() default Integer.MAX_VALUE;

   @OverridesAttribute(constraint=Pattern.class, name="regexp")
   String regexp();
}

...

<constraint annotation="com.mycompany.PatternOrSize">
   <element name="max">30</element>
   <element name="regexp">\x28\d{3}?\x29\x20\d{3}?\x2D\d{4}?</element>
<constraint>

Hth,

--Gunnar