I have an ArrayList of strings that I need to ensure are all internally unique (ie: {"1","2","3"} = OK, {"1","2","1"} = Error). I've managed to cobble together the code below but I'm running into the "forall w/ an internal from" issue. I don't believe an upgrade is feasible at the moment, so are there any alternative solutions? NOTE: The collection of both $factGroups and $checkGroups is almost definitely redundant, so please keep any laughing to a minimum =) rule "BR033" no-loop true when $fact : MyFact() //# Get 2 copies of all the Groups associated with the $fact $factGroups : ArrayList() from collect ( Group() from $fact.Groups ) $checkGroups : ArrayList() from collect ( Group() from $fact.Groups ) //# Traverse the $factGroups comparing each $currentGroup to the list //# within $checkGroups, erroring out if something other then 1 is found forall ( $currentGroup : Group(this memberOf $factGroups) $test : ArrayList(size != 1) from collect( Group(this == $currentGroup) from $checkGroups ) ) then System.out.println("Failed: BR033"); end I have found a number of postings that seem to be related, namely http://www.nabble.com/Best-practice-for-rules-against-multiple-objects-td... but I've been unable to cobble together a solution thus far. All help is appreciated! Thanks! -- View this message in context: http://www.nabble.com/Ensure-all-values-in-a-list-are-unique--tp23071079p... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

How are items added to the list? Can you just change the data structure to a set as Wolfgang suggested? If all the groups are in working memory you can write a rule similar to the following rule "check for dups" when $group1 : Group($index : index) $group2 : Group(this != $group1, index == $index) then System.out.println($group2 + " has a duplicate index "); end 2009/4/17 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; > Maybe I'm missing something but couldn't you simply create checkGroups as > a Set<String>and just compare its size() to $fact.Groups.size() ? > > > rule check > when > $fact : StrColl( $gr : groups, eval( $gr.size() != (new HashSet( > $gr )).size() ) ) > then > System.out.println( "failed" ); > end > > -W > > > On Fri, Apr 17, 2009 at 8:22 AM, campbeln <nicholas.campbell(a)arc.gov.au&gt;wrote: > >> >> I have an ArrayList of strings that I need to ensure are all internally >> unique (ie: {"1","2","3"} = OK, {"1","2","1"} = Error). I've managed to >> cobble together the code below but I'm running into the "forall w/ an >> internal from" issue. I don't believe an upgrade is feasible at the >> moment, >> so are there any alternative solutions? >> >> NOTE: The collection of both $factGroups and $checkGroups is almost >> definitely redundant, so please keep any laughing to a minimum =) >> >> >> rule "BR033" >> no-loop true >> when >> $fact : MyFact() >> >> //# Get 2 copies of all the Groups associated with the >> $fact >> $factGroups : ArrayList() from collect ( >> Group() from $fact.Groups >> ) >> $checkGroups : ArrayList() from collect ( >> Group() from $fact.Groups >> ) >> >> //# Traverse the $factGroups comparing each $currentGroup >> to the list >> //# within $checkGroups, erroring out if something other >> then 1 is found >> forall ( >> $currentGroup : Group(this memberOf $factGroups) >> $test : ArrayList(size != 1) from collect( >> Group(this == $currentGroup) from >> $checkGroups >> ) >> ) >> then >> System.out.println("Failed: BR033"); >> end >> >> I have found a number of postings that seem to be related, namely >> >> http://www.nabble.com/Best-practice-for-rules-against-multiple-objects-td... >> but I've been unable to cobble together a solution thus far. All help is >> appreciated! >> >> Thanks! >> -- >> View this message in context: >> http://www.nabble.com/Ensure-all-values-in-a-list-are-unique--tp23071079p... >> Sent from the drools - user 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 > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users