[rules-users] Getting one type from a collection of multiple types

The following code works, but I think it's ugly. the classes are: DescribedAddress is a base class for addresses VendorAddress extends DescribedAddress and implements method abcScore() Step getLocations() is defined as a list of DescribedAddress objects but it can also contain VendorAddress objects since they are a kind of DescribedAddress the LHS of the rule below extracts the VendorAddress with the highest abcScore from step.locations if I omit the eval(), i get ClassCastException on any DescribedAddress in locations, since DescribedAddress cannot be cast to VendorAddress. is there a more elegant / clean / efficient way to get only the VendorAddress objects from locations? rule "Find highest scored address" dialect "mvel" when $step : Step() $location : VendorAddress (eval($location instanceof VendorAddress ), abcScore>9) from $step.getLocations() not $addr : VendorAddress (eval($addr instanceof VendorAddress ),abcScore > $location.abcScore) from $step.getLocations() then System.out.println("high score is: " + $location.getAbcScore()); end -- View this message in context: http://drools.46999.n3.nabble.com/Getting-one-type-from-a-collection-of-m... Sent from the Drools: User forum mailing list archive at Nabble.com.