Re: [rules-users] Complex rule

Bryan, The main decision here is how to do Date arithmetic, since java does not provide easy to use APIs for that. So, the simplest way IMO, from a rule authoring perspective, is to have a "constraint object" that contain both boundary dates of your rule. Lets call it "Period". So, if you want to write your rule saying: "Take a break if you worked more than 10 days in the given period." Just do: rule "take a break" when Period( $sd : startDate, $ed : endDate ) Number( intValue > 10 ) from accumulate( Day( date >= $sd && <= $ed, status == Day.WORKED ), count( 1 ) ) then // take a break end If your Day object is some kind of container object, use a chained from to iterate over them: rule "take a break" when Period( $sd : startDate, $ed : endDate ) DailyReport( $days : days ) Number( intValue > 10 ) from accumulate( Day( date >= $sd && <= $ed, status == Day.WORKED ) from $days, count( 1 ) ) then // take a break end Hope it helps. Edson 2008/11/3 Bryan Hansen <bryankhansen(a)gmail.com&gt; > Not really sure how to go about writing this in a rule or whether or not > the logic belongs in a rule (I think it does, but if you don't please > comment as to why). > > I have a list of objects that contain date objects. If the list contains > 10 objects that date are before mine then I want them to take a break. > > The business case is similar to that of an HR system. If they have worked > too many days out of the last 12 then they need to take a break. > > I am guessing it would have to use the "collect" attribute, but how would > you do the date logic in a LHS clause? > > Thanks for any guidance on this. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users