Re: [rules-users] Collecting properties in a rule

Something like this? when $t : Town( ) $s : SuperMarket( town == $t, $lid : locationId ) $ls : HashSet( size == 3) from ( Location( locationId = $lid ) ) I suspect Location would have to override equals and hashCode correctly. Once you have some DRL that works I'd suggest moving to Guvnor. On 12 November 2011 23:15, LCode <j_whittlesea(a)hotmail.com&gt; wrote: > I am trying to write a rule via the guided rule editor and I am really > struggling. > > The following is a simplified explanation of my scenario: > > I have a model where there are lots of 'Town' objects, each town has any > number of 'Supermarket' objects and each supermarket has a list of > integers > 'locationID'. > > Something like this.... > > <Town> > <Supermarket name = 'asda'> > <LocationID>15</LocationID> > <LocationID>18</LocationID> > </Supermarket> > <Supermarket name = 'tesco'> > <LocationID>13</LocationID> > </Supermarket> > <Supermarket name = 'lidl'> > <LocationID>13</LocationID> > <LocationID>15</LocationID> > <LocationID>18</LocationID> > </Supermarket> > </Town> > > (apologies to the Sainsburys shoppers!!) > > I need to write a rule that fires when there are precisely 3 unique > location > ID's in the whole town. > > So in the example above the complete list of locationIDs would be 13, 13, > 15, 15, 18, 18 > With the following unique numbers 13, 15, 18 > therefore the rule would fire as there are 3 unique numbers. > > I hope that makes some sense. > > I understand that I should collect the locationIDs into a java.util.Set in > order to count unique entries and I can collect together all supermarkets > into an arraylist. However I cannot for the life of me seem to collect > LocationID across all supermarkets. > > Thank you so much in anticipation, I realise this was rather long-winded! > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Collecting-properties-in-a-rule-tp35035... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > 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