[rules-users] Maps in Drools

[Edson Tirelli]

when
   Map( this["type"] == "Point", $x : this["x"] )
   Map( this["type"] == "Circle", x == $x )
then
end


2009/8/19 André Thieme <address.good.until.2009.dec.14 at justmail.de>

> Edson Tirelli schrieb:
>
> >         when
> >                Customer( $custId : id )
> >                DailyOrders( count[$custId] == 1 )
> >         then
>
> Btw, this brings me to a new syntax question for the default Drools rule
> syntax. Is this possible:
>
> when
>   m:Map()
>   eval( m.get("type") == "Point", $x : m.get("x") )
>   ...
>   Circle( x == $x )
> then
>   ...
>
>
> or, an alternative which may be clearer:
>
> when
>   m:Map()
>   eval( m.get("type") == "Point" )
>   $x : m.get("x")
>   ...
> then
>   ...
>
> So, what I would like to have is:
> 1) looking at all Maps which have the value "Point" under the key "type"
> 2) of all those Maps: store in a var what value they have under key "x"
> 3) reuse the var, here $x instead of having an expensive lookup over and
>    over again.
>
> Is that possible? Or would I have to write my example above as
> ...
> c:Circle()
> eval(c.getX() == m.get("x"))
>
>
> André
> --
> Lisp is not dead. It’s just the URL that has changed:
> http://clojure.org/
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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