> 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 <
greg_barton@yahoo.com>
>
> 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 <
wishing.carebear@gmail.com>
> wrote:
>
> > From: Wishing Carebear <
wishing.carebear@gmail.com>
>
> > Subject: [rules-users] some pointers for solution
> > To:
rules-users@lists.jboss.org> > 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-----
>
> >
> > _______________________________________________
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> >
rules-users@lists.jboss.org> >
https://lists.jboss.org/mailman/listinfo/rules-users
>
> >
>
>
>
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