Because I keep forgetting the convenience functions exist. :P --- On Sun, 11/8/09, Edson Tirelli <[email protected]> wrote:
> From: Edson Tirelli <[email protected]> > Subject: Re: [rules-users] some pointers for solution > To: "Rules Users List" <[email protected]> > Date: Sunday, November 8, 2009, 4:41 PM > > Why not use count() accumulate function? ;) > > from accumulate( Criteria( this memberOf d, this memberOf q > ), > > count(1) ) > > Edson > > 2009/11/8 Greg Barton <[email protected]> > > In this case the accumulate clause > is maintaining a counter (total) that's incremented > whenever a Criteria is detected that is contained in both > the Data and Query object matched in the rule. So: > > > > > # Find Criteria that are contained in both the Data and > Query > > from accumulate( Criteria( this memberOf d, > this memberOf q ), > > # Initialize the counter to 0 > > init( int total = 0; ), > > # Increment when the above condition is matched > > action( total ++; ), > > # Decrement if a matched Criteria now fails to match > > reverse( total --; ), > > # return the total when all known Criteria are matched > > result( total ) ) > > > > --- On Sun, 11/8/09, Wishing Carebear <[email protected]> > wrote: > > > > > From: Wishing Carebear <[email protected]> > > > Subject: Re: [rules-users] some pointers for > solution > > > To: "Rules Users List" <[email protected]> > > > Date: Sunday, November 8, 2009, 11:39 AM > > > Hi Greg: > > > I'm trying to understand your first > > > solution. > > > > > > Ran the project and it works fine. If possible could > > > you explain me little bit on : > > > > > > from accumulate( Criteria( this memberOf d, > > > this memberOf q ), > > > init( int total = 0; ), > > > action( total ++; ), > > > reverse( total --; ), > > > result( total ) ) > > > > > > > > > Thanks, > > > cabear > > > > > > > > > 2009/11/8 Greg Barton <[email protected]> > > > > > > There are a couple of > > > ways to do this. I'm sure there's a bit more > clean > > > way than the example I'm providing, but this > should get > > > you in the right direction. It's not 100% > rules, > > > because it involves a bit of java collections > trickery. (See > > > attached project, > collection_DroolsCriteriaMatch.tar.gz) > > > > > > > > > The heart of it is a single rule: > > > > > > rule "Match" > > > when > > > d : Data() > > > q : Query( size <= d.size ) > > > Number( intValue == q.size ) > > > from accumulate( > > > Criteria( this memberOf d, this memberOf q ), > > > > > > init( int total = 0; ), > > > action( total ++; ), > > > reverse( total --; ), > > > result( total ) > > > ) > > > then > > > System.out.println("Match: " + d + > " > > > and " + q) ; > > > end > > > > > > The Data object holds data to be queried, Query > objects are > > > asserted to match the Data, and Criteria objects can > be > > > contained in either. (With the aforementioned > collections > > > trickery that if a Criteria is contained in a Query it > can > > > be found in a Data object, but the reverse isn't > true. > > > See the Query.contains(Object) method for how > that's > > > implemented.) > > > > > > > > > So the rule above basically says "There's a > Data > > > object, and all of the Query objects Criteria are > contained > > > in the Data object." > > > > > > There's an alternate way of doing this using eval > and a > > > bit more java fu. See the > eval_DroolsCriteriaMatch.tar.gz > > > project attached. This one's probably not > optimal, > > > though, as it's basically a brute force check of > all > > > Data objects against the asserted Query. > > > > > > > > > I tried for a while to get a solution working with > > > different criteria types from both Data and Query > objects > > > being asserted into working memory, but I couldn't > get > > > the accumulate syntax right. Anyone know of a way to > do > > > that? (I figure that would get a "pure > rules" > > > solution.) > > > > > > > > > --- On Sat, 11/7/09, Wishing Carebear <[email protected]> > > > wrote: > > > > > > > From: Wishing Carebear <[email protected]> > > > > > > > Subject: [rules-users] some pointers for > solution > > > > To: [email protected] > > > > Date: Saturday, November 7, 2009, 10:19 PM > > > > > > > > > > > > > Hello: > > > > There are n selection criteria from s1 .. sn for > each > > > > item i1.. in. Each item can have a subset of > criteria > > > which > > > > applies to them. > > > > > > > > The end user, can choose a subset of criteria > like c1 > > > > > > > and c5 and only the item that has c1 and c5 > valid > > > should be > > > > returned. For example: if item i1 and i2 have > > > criterias > > > > valid for c1, c2, c5, c6, c8 since the request is > only > > > for > > > > criteria c1 and c5, i1 and i2 must be returned. > > > > > > > > > > > > > > > Is it possible to write a rule using drools for > this > > > > requirement. > > > > > > > > Thanks for your help and time, > > > > cabear > > > > > > > > -----Inline Attachment Follows----- > > > > > > > > > > > _______________________________________________ > > > > 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 > > > > > > > > > > > > > > > > > > -----Inline Attachment Follows----- > > > > > > _______________________________________________ > > > 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 > > > > > -- > Edson Tirelli > JBoss Drools Core Development > JBoss by Red Hat @ www.jboss.com > > > -----Inline Attachment Follows----- > > _______________________________________________ > 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
