[rules-users] Drools and ArrayList

[wendy]

Have you tried using the accumulate function?

//taken from the link below and modified a bit to use count.. (it is
untested)

rule "Count the number of items in the order"
when
    $order : Order()
    $total : Number( ) 
             from accumulate( OrderItem( order == $order),  count( ) )
then
 System.out.println("There are "+$total+ " number of items in the order");

end


http://docs.redhat.com/docs/en-US/JBoss_Enterprise_SOA_Platform/4.3/html/JBoss_Rules_Reference_Guide/ch05s05s02s10.html 

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