Hello all, I experienced a problem I can't solve. After rules firing I got a number of facts of certain type. I would like to get a collection of facts sorted by custom field with a query. Drools guide proposes to sort facts by a rule like: rule "Rule 03" when $number : Number( ) not Number( intValue < $number.intValue ) then System.out.println("Number found with value: "+$number.intValue() ); retract( $number ); end But it doesn't suit me: 1) I can't retract facts from session 2) I need to get sorted collection with a query which doesn't have 'then' part. Is there any method to get custom sorted collection with a query? -- View this message in context: http://drools.46999.n3.nabble.com/facts-custom-sort-tp3538410p3538410.html 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

I don't want to sort facts outside of drools rules. The sorting is part of business requirements. My opinion is that is not a good thing to keep parts of business logic in different places. I spent some time to figure out how it is possible to sort a collection of facts and here is my solution: --------------------------- function String factKey(Fact f) { return String.format( "%010d~~%s~~%s", f.getRank(), f.getName(), f.getValue() ); } query sortFactsQuery $factsMap: HashMap() from accumulate( $f: Fact(), init( HashMap map = new HashMap(); ), action( map.put(factKey($f), $f); ), reverse( map.remove(factKey($f)); ), result( map ) ) $sortedKeyList: TreeSet() from collect( String() from $factsMap.keySet() ) $sortedFacts: List() from accumulate( $key: String() from $sortedKeyList, collectList( $factsMap.get( $key ) ) ) end ----------------------- -- View this message in context: http://drools.46999.n3.nabble.com/facts-custom-sort-tp3538410p3541805.html 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