[rules-users] Multipattern collect

[Edson Tirelli]

   Geoffrey,

   What you want is simply to constrain the inner pattern:

rule "calculateTopicConflict"
     when
         $leftTopic : Topic($id : id);
         $rightTopic : Topic(id > $id);
         $studentSet : HashSet( size > 0 )
             from collect(
                 $student : Student( this memberOf $leftTopic.studentList,
this memberOf $rightTopic.studentList )  );
     then
         insertLogical(new TopicConflict($leftTopic , $rightTopic ,
$studentSet));
end

   []s
   Edson


2007/11/17, Geoffrey De Smet <ge0ffrey.spam at gmail.com>:
>
> Is a multipattern collect supported?
>
> I have a rule which finds all 2 topics and all the students they share
> if there is at least 1 such student:
>
> rule "calculateTopicConflict"
>      when
>          $leftTopic : Topic($id : id);
>          $rightTopic : Topic(id > $id);
>          $studentSet : HashSet( size > 0 )
>              from collect(
>                  $student : Student(),
>                  $leftTopic.studentList contains $student,
>                  $rightTopic.studentList contains $student
>              );
>      then
>          insertLogical(new TopicConflict($leftTopic , $rightTopic ,
> $studentSet));
> end
>
>
> This won't compile:
> Caused by: org.drools.rule.InvalidRulePackage: [29,36]: unknown:29:36
> mismatched token: [@370,1504:1504=',',<11>,29:36]; expecting type
> RIGHT_PAREN[30,39]: unknown:30:39 mismatched token:
> [@376,1545:1552='contains',<49>,30:39]; expecting type
> LEFT_PAREN[30,48]: unknown:30:48 Unexpected token '$student'
>         at org.drools.rule.Package.checkValidity(Package.java:424)
>
>
> Is a multipattern collect supported?
>
> Thanks for your help :)
>
> --
> With kind regards,
> Geoffrey De Smet
>
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>



-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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