[rules-users] Ensure all values in a list are unique?

[Wolfgang Laun]

The HashSet is created on the fly, just for checking; no data structure
needs to be changed.

I'm not sure I understand what you mean by "check for dups", but that may be
because I don't see class the details of class Group.

-W

2009/4/17 David Sinclair <dsinclair at chariotsolutions.com>

> 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 at gmail.com>
>
>> 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 at arc.gov.au>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-td5621720.html#a5621720
>>> 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--tp23071079p23071079.html
>>> Sent from the drools - user mailing list archive at Nabble.com.
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>>
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>
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