I am not sure exactly what you are trying to express with your example, but more likely than not, you'll be able to do what you are trying through the collect conditional element.

Something along the lines of this?

    a: Answer($responses : responses)
    java.util.ArrayList( size > 1 ) from collect (String(this == "a" || == "b" || == "c") from $responses)
    System.out.println("Cannot have more than one response!");

On Fri, Aug 22, 2008 at 4:18 PM, David Cracauer <dcracauer@earthlink.net> wrote:

I'm getting stuck on this and I'm hoping someone can help..
I need to be able to check that a collection contains one, and only one item
from another collection.

Ideally, I would do something like this:

 a:Answer(responses contains one of ("a","b","c"));

Is there a way do do this without resorting to evals or predicate
expressions? (drools 4.07)


View this message in context: http://www.nabble.com/Can-I-check-if-a-collection-contains-one-of-another-collection-tp19114896p19114896.html
Sent from the drools - user mailing list archive at Nabble.com.

rules-users mailing list