Hi. I tried to identify relevant ways for some container specific operations like exists, forall (or foreach). Basically I have started using for software product line research, and specifically model checking over product line models. The initial results so fat ( considering the time I started) have been wonderful, alas I am tuck at this point. For example, consider : import java.util.List; import java.util.Arrays; import java.util.ArrayList; declare Project a : int b : int = 5 list : List = new java.util.ArrayList(java.util.Arrays.asList(1 , 2 , 3 , 4 , 5)) end Now that the element of Project - list is configured, I would like to perform some operations on it like: a) for each - for the list (Project - P; P.list), is each element is greater than 2? (or in essence - evaluating each element using a boolean expression). b) Similarly, a function like exists . for the list, is there any element for which this expression is satisfied - t > 2 && t < 5, where t is the iterator for the list.

As the elements of the lists are mere numbers (in this case ints), I am not really aware/clear how I can use the Drools operations collect, for all etc. Previously I worked with Jess rule engine, and it has in built lambda functions which nicely provides list iterators and thus evaluating each element of the list against a boolean expression. I am at a very important point in my work, and any hint or solution will be highly appreciated. Many thanks :) Phani -- View this message in context: http://drools.46999.n3.nabble.com/Reg-Iterating-over-a-list-tp4019512.html Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Another issue I am stuck up is again a container operation (:( ). I have my rule something like this: //I have a global List defined as global java.util.ArrayList cList // Function isDefined as : function boolean isDefined(Object o) { return o != null; } //size as function int size(List list) { return list.size(); } //and finally append as function List append(List list, Number num) { list.add(num); return list; } rule "94" agenda-group "Group 2" dialect "mvel" no-loop true when P : Project() Project( isDefined(seq_A) && !(size(append(seq_A , 99 )) > 4)) then System.out.println("Rule not satisfied # " + 94 + setStatics() ); cList.add(94); end ......................................... I declared a type called "Project" which basically holds the variables seq_A, seq_B and everything else. I configured the value of seq_A using a rule - with agenda group as "Config rule". The problem with the rule is that, it is firing and activating a similar rule in a different agenda group. However, I am setting focus for each group separately and firing rules like the following: ksession.getAgenda().getAgendaGroup("Group Config").setFocus(); ksession.fireAllRules(); ksession.getAgenda().getAgendaGroup("Group 0").setFocus(); ksession.fireAllRules(); ksession.getAgenda().getAgendaGroup("Group 1").setFocus(); ksession.fireAllRules(); ksession.getAgenda().getAgendaGroup("Group 2").setFocus(); ksession.fireAllRules(); After the rules are fired, I am getting the value for P_seqA as [1, 2, 3, 4, 5, 199, 199], where as my intention was to to get [1, 2, 3, 4, 5, 199]. In essence, the append function is being called two times. This is the same case for any of the append (and prepend) operations, I am doing. This seems to be very confusing to me and I have already spend hours on this. I just do not want to activate rules outside the current agenda group. Many many thanks in advance :) -- View this message in context: http://drools.46999.n3.nabble.com/Reg-Iterating-over-a-list-tp4019512p401... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Oh Ok, I get the point. The engine evaluates all the patterns when the current rule is being evaluated. And I have (!size(append(list, number)) > 0) on the LHS, and so the append function is being evaluated. Is it possible to command the engine to not check patterns of a certain rules or certain agenda groups.

BR Phani -- View this message in context: http://drools.46999.n3.nabble.com/Reg-Iterating-over-a-list-tp4019512p401... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users