[rules-users] DRL - Accessors that take arguments

[Edson Tirelli]

   For arbitrary method calls, the only way is to use an eval:

VO( eval( computePrice("key") < 10 ) )

   Although, if you have a method that returns a map, you can use simplified
Map syntax:

class VO {
   ...
   public Map getComputeMap() {...}
}

   Then:

VO( computeMap["key"] < 10 )


   []s
   Edson

2009/6/1 Vidya Chandrasekaran <aydiv.c at gmail.com>

>
> Hi,
>
> I am fairly new to Drools and am just getting my feet wet with writing
> rules.
>
> In my work, I have to integrate drools with classes that do not expose all
> properties via getXXX/ isXXX accessor methods but require a call of the form
> someMethod("keyvalue"). I have been using the MVEL dialect and do not see a
> way to call a function with arguments on the LHS side of a rule either in
> the documentation or the mailing list.
>
>
> In fact, I have been trying something like
>
> rule "rulename"
>     agenda-group "evaluation"
> when
>     $d: VO( computePrice("key") < 10) from entry-point "Inventory
> stream"
> then
>     #
> end
>
> This fails with a 'no viable alternative at input '"key"' in rule. Is there
> a way this can be accomplished?
>
> Thanks,
> Vidya
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 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/20090601/4b8684b2/attachment.html