[rules-users] Lists and enums in Drools

[Wolfgang Laun]

The list that might contain the value of type is alphaList, not $test, which
is the reference to the object containing the list as a field.
-W

2009/5/14 Armaghan Mahmud <mahmud.armaghan at gmail.com>

> Hi,
>
> I need help with constructing rules for my scenario.
>
> I started off by creating enum values in the main java file and comparing
> them with the rules to get different responses for different enum values.
> That was easy.
>
> This time, I'm constructing a list of enum values and passing them into the
> rules engine as well. I would like to configure my rules in such a way that
> when they look for the different enum values, they should also look in the
> list to test if the enum value passed into the rules engine is a member of
> the list or not.  My old rules looked like this:
>
> rule "Testing for Alpha"
> salience 100
> when
>     alpha : AlphaWrapperClass(type == Class.ALPHA)
> then
>     System.out.println("Found Alpha");
>     alpha.isFound(true);
> end
>
> I tweaked the above rule to :
>
> rule "Testing for Alpha"
> salience 100
> when
>     $test: AlphaEnumCollectionsWrapperClass(alphaList : alphaList)
>     alpha : AlphaWrapperClass(type == Class.ALPHA && $test contains type )
> then
>     System.out.println("Found Loudspeaker Equipment. Who wants to jam that?
> Must resist... Jamming sequence in progress... ");
>     materiel.setJam(true);
> end
>
> But I'm seeing the following error:
>
> org.drools.rule.InvalidRulePackage: Unable to create Field Extractor for
> '$test' of '[ClassObjectType classAlphaEnumCollectionsWrapperClass]' in rule
> "Testing for Alpha": [Rule name=Testing for Alpha, agendaGroup=MAIN,
> salience=100, no-loop=false]
>
> I'd greatly appreciate your help.
>
> Thanks,
> Armaghan
>
>
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