[rules-users] Collection & Emptyness

[Mark Proctor]

I'd create a function called isEmpty, or call of a static method on a class.

VenueGlobal( (isEmpty( sousVenues) ) )

Mark


vdelbart wrote:
> Hi,
>
> I have an object 'VenueGlobal' with a property 'sousVenues' who is a List of
> SousVenue. I try to test the emptyness of this list in on sentence but i
> don't know why it doesn't work :
>
> I try this :
>
> VenueGlobal( sousVenues == null || sousVenues.empty )
>
> but I have this error :
>
> org.drools.rule.InvalidRulePackage: [11,53]: unknown:11:53 Unexpected token
> ')'
> 	at org.drools.rule.Package.checkValidity(Package.java:424)
>
> I try this :
>
> VenueGlobal( sousVenues == null || sousVenues.size == 0 )
>
> but I have this error :
>
> Caused by: org.mvel.PropertyAccessException: unable to resolve property:
> size
> 	at
> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:382)
>
>
> I don't know what the solution ?
>
>
> regards,
>
> V.
>
>
>