[rules-users] Handling maps in Drools

[Wolfgang Laun]

This rule works with 5.1.1:

rule "Map test"
when
    $rb : Certifications($reqCertificationKeys : requiredCertifications.keySet)
    $user : User( $userCertifications : userCertifications )
    Number( $score : intValue ) from accumulate( $key: String( this
memberOf ($userCertifications.keySet()) ) from $reqCertificationKeys,
                sum( $userCertifications.get( $key ) ) )
then
    System.out.println( "score is " + $score );
end

-W

On 16/08/2012, Manav <manav7574 at yahoo.com> wrote:
> Hi,
>
> I am facing an issue with handling maps in LHS of drools. Appreciate your
> help with the same.
>
> I am using Drools version 5.1.
>
>
> I have two maps where one is a reference map that contains certifications
> (key) and scores(value) required and other is map of user's actual
> certifications and scores. Objective is to find the certifications from
> users map based on keys in the reference map . Then for these certifications
> sum the score values and check if they cross the threshold.
>
> While trying to do the first step i am facing an issue . My rule looks like
> this :-
>
> rule "Map test"
> when
>     $rb : Certifications($reqCertificationKeys :
> requiredCertifications.keySet)
>     $user : User($userCertifications : userCertifications)
>     $arg : String() from $reqCertificationKeys
>     HashMap ($value : this[$arg] != null) from $userCertifications // Does
> not work
> then
>     System.out.println ("Hash Map" + $arg);
> end
>
> However if i change the above line that has issues with below
>
>     HashMap ($value : this["Java"] != null) from $userCertifications //
> Works
>
> Is there a way to replace the key with a variable than with a fixed value ?
> Is it possible to iterate the second map with the key values that we get
> from the reference map ?
>
> Regards,
> Manav
>
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