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

Thank you Edson, this helps me get going in the right direction. In this logic: Period( $sd : startDate, $ed : endDate ) Number( intValue > 10 ) from accumulate( Day( date >= $sd && <= $ed, status == Day.WORKED ), count( 1 ) ) Where is date coming from? As I read the statements, I am getting startDate and endDate from a Period object that I pass in. The Number() statement just says to take the result and parse it as a number right? What about Day and date though? Is Day a java object from my Java code? I searched the docs looking for a Day object in the drools docs and didn't come up with anything. I am assuming it is because of the Day.WORKED status, would date just be a member of that object? Thanks, Bryan On Mon, Nov 3, 2008 at 7:51 PM, Edson Tirelli <tirelli(a)post.com&gt; wrote: > > 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 > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users