Re: [rules-users] using homemade Date in Drools

How about a slight modification on Mike's solution: rule XXX when obj1 : A( $date1: mydate) obj2 : A( $date2: mydate) eval($date1.isBefore($date2)) then // something obj1.doSomething(); End I think eval allows you access to the methods in your custom Date class so you can call isBefore in there after binding $date1 and $date 2 to any custom date objects. I still new to Drools, so this may not be correct. Regards Shahad On 5/21/07, Maxime Catelin <mcatelin(a)perinfo.com > wrote: > > Thanks for your input. That seems to involve some modifications, on our > Date class and all the classes that have Date members. That's not > exactly what i thought of doing but maybe that's the only way. > > What I meant was to to find a way to compare those dates eventually > using the date methods we have (isAfter() or isBefore() for exemple) and > > to "keep" only the object with the latest date. So if there are several > A objects in the working memory, we will only fire the one with the > latest date. > > rule XXX > > when > obj : A( $date : mydate) > not A( $date.isBefore(mydate)) // does not work but that what i was > thinking > then > // something > obj.doSomething(); > end > > > > Anstis, Michael (M.) a écrit : > > The simplest way could be to have your Date expose a "Time" type > member > > (like java.util.Date.getTime()) that represents the number of > > seconds\milliseconds etc since a given point in time ("your absolute > > zero" for example; being day * month * year * H * M * s * ms). This > > could then be used as a simple predicate condition:- > > > > rule XXX > > when > > obj1 : A( $time : myTime) > > obj2 : A( myTime < $time ) > > then > > // something > > obj.doSomething(); > > End > > > > Thanks, > > > > Mike > > > > -----Original Message----- > > From: rules-users-bounces(a)lists.jboss.org > > [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Maxime > Catelin > > Sent: 21 May 2007 14:34 > > To: Rules Users List > > Subject: [rules-users] using homemade Date in Drools > > > > Hi, > > > > We are using a lot of Dates in our application but we use a homemade > > Date class for that. Therefore, we cannot use > and < provided by > > Drools. I looked through the mailing list but could not find any > > examples using Dates in Drools other than in the documentation. What > > interested me in particular in the documentation was "If more control > is > > > > required, use the predicate constraint." > > > > Could someone give some examples of using predicate constraint with > > dates? > > > > Something I would like to do, for example, is the following : > > > > If there is an obj1 of class A with field of type Date d1 and another > > obj2 of class A with field Date d2, where d1 is before d2, obj2 should > > > be used to fire something. > > > > rule XXX > > when > > obj : A( $date : mydate) > > // do not know how to use constraint on date here. > > then > > // something > > obj.doSomething(); > > end > > > > Thanks for your input. > > _______________________________________________ > > 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 > > > > > > > _______________________________________________ > 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