[rules-users] Drools and ArrayList

[Wolfgang Laun]

This is how to do it - although it's not recommended to use globals in rule
conditions. (For one thing: the list must be complete before you call
fireAllRules().)

global List list

rule "count from global List - but don't do it"
when
    Number( $i: intValue ) from accumulate( Person( age > 20 ) from list,
count(1) )
then
    System.out.println( $i + " Persons" );
end

-W


On 6 July 2011 12:08, wendy <w.mungovan at yahoo.com> wrote:

> I think normally setGlobal variables are only used when you want to be able
> to call back out to the java code again. (I'm not an expert by any stretch
> so please take that with a grain of salt.) So you might be able to just
> insert the list.
>
> I'm going to assume the List is really List<NombersUnTypeDefault> if that
> is
> not true please let me know.
>
> what about something like this?  First is collects all the
> NombersUnTypeDefault that match your constraints from list then it counts
> them using an accumulate function.
>
> global java.util.List list
>
> rule "Calcul redondance"
>   when
>       $i: Number() from accumulate($c: NombersUnTypeDefault()
>                               from collect(NombersUnTypeDefault($code ==
> "AAA", $int == 1) from list)
>                               , count($c));
>    then
>       System.out.println($i);
> end
>
> --
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