[rules-users] Comparing names

[Wolfgang Laun]

Assuming that your facts are structured as the indentation suggests, I would
solve this using a technique you could call "virtual field". So, if a fact
object has fields
   String title
   List<PropGroup> pgList

and a PropGroup has fields
  String name
  List<String> pList

I would not try to get at the embedded data from the objects contained
within List<PropGroup>. Rather, I'd add a couple of getters to your Fact
class, each of which would return a Set<String> computed from the contained
List<PropGroup>. Then the rule simply becomes

rule "check-same"
    when
        $p1 : Fact( $t1 : title, $g1 : groupNames, $p1 : propNames )
        $p2 : Fact( this != $p1, $t2 : title,  ( groupNames != $g1 ||
propNames != $p1 ) )
    then
        System.out.println( "mismatch " + $t1 + " and " + $t2 );
    end

Notice that this won't find the odd-man-out; it will fire twice for each
unequal pair.

-W


2009/5/14 Ian Spence <ianspence at gmail.com>

> Hello all,
>
> I am new to Drools…
>
>
>
> I have a scenario
>
>
>
> Each fact object will have the structure:
>
>
>
> Title
>
>    Proprietor Group
>
>       Proprietor Name
>
>
>
> E.g.
>
>             2100-100
>
>                         J2 ½ share
>
>                                     SMITH, JOHN
>
>                                     JONES, FRED
>
>                         T ½ share
>
>                                     BROWN, CHARLIE
>
>             2100-101
>
>                         J2 ½ share
>
>                                     BROWN, CHARLIE
>
>                                     JONES, FRED
>
>                         T ½ share
>
>                                     SMITH, JOHN
>
>             2100-102
>
>                         T ½ share
>
>                                     BROWN, CHARLIE
>
>                         J2 ½ share
>
>                                     JONES, FRED
>
>                                     SMITH, JOHN
>
>
>
> The group names and the proprietor names must be the same across each
> Title.  The scenario above is a valid case. A failed case would result for
> Title 2100-100 if we add an extra Proprietor name e.g. WHITE, MARY.
>
>
>
> I anticipate having one rule to cater for this.  I am hedging towards the
> ‘collect’ operator but cannot get a clear picture on how to implement it.
>
>
> --
> Regards,
> Ian Spence
>
>
>
> _______________________________________________
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>
>
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