I can't say for sure whether it would help since I don't know how all the rules for the different *EventType classes are related, but you might have a look at the "template" feature. Version 5.0 has an additional feature which will let you create bunches of similar rules from a template, inserting parameters from a collection of objects. Using this, the BizLocation rule could be easily produced in triplicate, once for each EventType.

-W


On Thu, May 14, 2009 at 12:35 PM, Christoph Kramer <amrod@gmx.de> wrote:
Hi all,
i've some problems with a ClassCastException when using the "or"-conditional element.
I have different Java-Beans which all have some string-values. Now I want to create one rule which is able to handle every type of my classes because it would be a lot of work to create one rule for every class.
Depending on the type of beans in the working memory the programm is crashing with an ClassCastException.

Here is a snippet of my drl-file with the "crashing-rule":

rule "BizLocation"
  when
      $epc : EPC()
      QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation !=null ) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc : bizLocation != null) or ObjectEventType(epcList.epc  contains $epc, $bizLoc : bizLocation != null)
  then
      System.out.println("BizLocation: " +$bizLoc.getId());
end


There are some EPC's in the working memory and some Events (which might be of type QuantityEventType, AggregationEventType or ObjectEventType). When there are only ObjectEventType in the working memory, everything works fine, but wenn there is an QuantityEventType this rule crashes with "org.fosstrak.epcis.model.QuantityEventType cannot be cast to org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.


Can anyone give me a hint where is the error?

Thanks,
Christoph

PS: Sorry for the bad english :(
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