[rules-users] Re: Multipattern collect
Thanks Edson :)
"memberOf" isn't in the manual index,
It's hidden away under 6.5.2.1.1.3.1. Operators,
maybe the index could be refactored so those operators are listed?
"6.5.2.1. Pattern" contains a lot of useful information, but there's not
decent overview of it's content.
I would even go so far to propose splitting "6.5.2. Left Hand Side
(when) Conditional Elements" from chapter 6, as it's - imho - a highly
critical reference for writing rules, so maybe even a top level chapter.
Just some thoughts, feel free to ignore :)
With kind regards,
Geoffrey De Smet
Edson Tirelli wrote:
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(a)gmail.com
<mailto:ge0ffrey.spam@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
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