Hi Antonio,
Documentation states that the complement to not is exists,whereas not
keyword is used to match the absence of a fact (in Working Memory), and
exists keyword is used to test the existence of one or more facts (in Working
memory).
So if you want to test that a fact is not in working memory, then you should
use the
not(MyClass()) pattern.
Hope this helps,
Francois.
Antonio Neto antoniosouzan...@gmail.com a écrit :
Any idea? Please...
2010/5/4 Antonio Neto antoniosouzan...@gmail.com
Hi all,
I don't know exactly why I have a problem in my exists function. I've
tried many different ways, but it does not work. Anybody could help me,
please?
I have the following rules:
*rule diff
when
$var1: EReference(name == employee)
$var2: EClass(name == Company, EAllReferences contains $var1)
not (exists( EPackage(EClassifiers contains $var2 ) ))
then
insertLogical(new IntConstraintOccurrence(diff, 10));
end
rule ClassesNotReferenced
when
$q1 : EClass();
$q2 : EPackage(EClassifiers contains $q1);
not( exists ( EReference(EType == $q1) ));
then
insertLogical(new IntConstraintOccurrence(ClassesNotReferenced,
1, $q1));
end*
and in my facts (and my EPackage) I have 4 instances of EClass Company
with a EReference employee, and another EClass Person. I still have a
move that removes EClasses in my Drools Solver.
I need to have only one classe Company after processing. But it removes
only the EClass Person, when it was supposed to remove one EClass Person
and 3 ECLasses Company. Leaving one EClass Company in the end.
The problem is: when Drools tries to remove a EClass Person it thinks
that the EClass Company does not exists. But in fact there are 3 others.
Any clue about it, please ?
Thanks
Bests regards
Antonio
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