2011/3/25 Swindells, Thomas <[email protected]> > I thought from was effectively typeless (as it’s operating against a List > it can’t always know the type of the members anyway) and so it allows any > type on teh left – giving a runtime class cast exception if it can’t do the > conversion. Therefore if you know they type you are expecting you can still > use it on the LHS with whatever constraints you want? >
Sure, "from" doesn't care what it produces, but accumulate functions have to return an object of some type. Currently. min and max return java.lang.Double; therefore you can use java.lang.Number as a portmanteau type. If min and max should include Data (and all other Comparable's), the actual result type will have to be Comparable (or Object). -W > > > Thomas > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Wolfgang Laun > *Sent:* 25 March 2011 09:23 > *To:* Rules Users List > *Subject:* Re: [rules-users] accumulate min over java.util.Date > > > > Now don't be hasty with a JIRA. Using Comparable for the arguments of the > min and max accumulate functions will give you a result that is -- > Comparable. So: > > $min: Comparable() from accumulate( Schedule( $d: date ), min( $d ) ) > > OK, this will give you the minimum data, bound to $min, although it won't > let you write any constraint for the "Comparable" result fact. But, what's > worse, it will not let you write > > $min: Number( intValue > 100 ) from accumulate( X( $y: y ), min( $y ) ) > > any more (unless I'm very much mistaken). > > -W > > > On 25 March 2011 03:56, Greg Barton <[email protected]> wrote: > > Well, if it can work that way it should. I'd say open a JIRA and request > that feature. It works with the "principle of least confusion." :) > > > --- On Thu, 3/24/11, jkrupka <[email protected]> wrote: > > > From: jkrupka <[email protected]> > > > Subject: Re: [rules-users] accumulate min over java.util.Date > > > To: [email protected] > > > Date: Thursday, March 24, 2011, 8:26 PM > > > Yea the docs weren't really clear > > about it, so I just thought it would work > > for anything that implemented Comparable =) > > > > Yep, used the long from getTime() - not the prettiest way > > of doing it, but > > it works great. > > > > Thanks! > > > > -- > > View this message in context: > http://drools-java-rules-engine.46999.n3.nabble.com/accumulate-min-over-java-util-Date-tp2726081p2728477.html > > Sent from the Drools - User mailing list archive at > > Nabble.com. > > _______________________________________________ > > rules-users mailing list > > [email protected] > > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > > > ------------------------------ > > > ************************************************************************************** > This message is confidential and intended only for the addressee. If you > have received this message in error, please immediately notify the > [email protected] and delete it from your system as well as any copies. > The content of e-mails as well as traffic data may be monitored by NDS for > employment and security purposes. To protect the environment please do not > print this e-mail unless necessary. > > NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 > 4EX, United Kingdom. A company registered in England and Wales. Registered > no. 3080780. VAT no. GB 603 8808 40-00 > > ************************************************************************************** > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > >
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