2009/5/14 Wolfgang Laun <wolfgang.laun@gmail.com>

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@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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