[rules-users] Working with Maps

[Edson Tirelli]

   You should really consider creating a proper fact class for your fact,
instead of using maps... rules will not be clear using maps.

   Anyway, I did not tested, but the following should work in case you
really want to use the maps, but again, it is a good practice:

when
    $map : Map()
    Number( $t1: intValue ) from accumulate(
                Map.Entry( key in ("301", "302, "303"), $v : value ) from
$map.entrySet(),
                sum( $v ) )
    Number( $t2: intValue > 0 ) from accumulate(
                Map.Entry( key in ("301", "302, "303"), $v : value > 0 )
from $map.entrySet(),
                count( $v ) )
    eval( ( $t1/$t2 > 1 ) && ($t1/$t2 < 10 ) )
then
   ...
end

    []s
    Edson


2008/4/9 Gerald Cantor <geraldmcantor at yahoo.com>:

>
> I have a Map in working memory. The Map has Strings as keys and Integers
> as
> values. It has 7 keys (REG301, REG302, ... REG307). I'm looking for a way
> to
> incorporate the following into the LHS of a rule:
>
> For keys 301, 302, 303, compute the total of the Integer values (total 1)
> For keys 301, 302, 303, compute the number of keys that have greater than
> 0
> values (total 2)
> Divide total 1 by total 2 (if total 2 > 0) and check against a range
>
> For keys 304, 305, 306, 307, compute the total of the Integer values
> (total
> 3)
> For keys 304, 305, 306, 307, compute the number of keys that have greater
> than 0 values (total 4)
> Divide total 3 by total 4 (if total 4 > 0) and check against a range
>
> I have not seen a way to collect / sum over select Map elements.
>
> Any insight as to how I would compute the above totals using collect / sum
> would be very much appreciated.
>
> Thanks in advance,
> Gerald
> --
> View this message in context:
> http://www.nabble.com/Working-with-Maps-tp16597566p16597566.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



-- 
Edson Tirelli
JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20080409/25fdb554/attachment.html