[rules-users] accumulate min over java.util.Date

[Michael Anstis]

As Greg eludes to the default "min" accumulate function expects
(java.lang.)Numbers.

If you require one to handle dates you can write your own custom Accumulate
Function.

On 24 March 2011 17:50, Greg Barton <greg_barton at yahoo.com> wrote:

> That's because a java.util.Date is not a java.lang.Number. :)  You can get
> the long value behind the Date by calling Date.getTime(), though.  Try that.
>
> --- On Thu, 3/24/11, jkrupka <jkrupka at gmail.com> wrote:
>
> > From: jkrupka <jkrupka at gmail.com>
> > Subject: [rules-users] accumulate min over java.util.Date
> > To: rules-users at lists.jboss.org
> > Date: Thursday, March 24, 2011, 12:07 PM
> > Should I be able to do an accumulate
> > min over java.util.Date objects?  Like
> > this:
> > $minDate : Date() from accumulate(MyFact ($startDate :
> > startDate),
> >
> >         min($startDate))
> >
> > I would have thought so, but when I try it, I'm getting:
> >
> > Caused by: java.lang.ClassCastException: java.util.Date
> > cannot be cast to
> > java.lang.Number
> >     at
> >
> org.drools.base.accumulators.MinAccumulateFunction.accumulate(MinAccumulateFunction.java:76)
> >
> >
> >
> > If it should work, then it's possible I'm doing something
> > else wrong, but
> > everything looks correct to me.  I can always work
> > around it by getting the
> > milliseconds from the Date object and doing the min over
> > that... it's just
> > not as clean looking.
> >
> > --
> > View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/accumulate-min-over-java-util-Date-tp2726081p2726081.html
> > Sent from the Drools - User mailing list archive at
> > Nabble.com.
> > _______________________________________________
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> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
>
>
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