You have to establish one representative of each subgroup that is markedly
distinct from all of its siblings in the same subgroup. This triggers a
single firing for a unique a/b combination. Then you can collect all those
that match the representative. With attribute c being what it is in your
example:
Fact( $a: a, $b: b, $c: c )
not Fact( c < $c )
$list: List() from collect ( Fact( a == $a, b == $b ) )
-W
On 14 May 2012 21:05, Mike Goldner <mike(a)thegoldners.com> wrote:
I have a single rule that includes a "collect" pattern to
pass a
collection to the RHS. However, what I now need to do fire this rule for
multiple collections based on groupings defined by attributes on the fact.
Here is an example:
Fact(a = 1, b = 1, c = 1)
Fact(a = 1, b = 1, c = 2)
Fact(a = 2, b = 1, c = 3)
Fact(a = 2, b = 2, c = 4)
Fact(a = 2, b = 2, c = 5)
I would like to create sub-groups based on the attributes 'a' and 'b'.
My
rule should fire three times for the facts listed above, providing the
corresponding collection of Fact.
The only solution that I can think of is to build a HashSet and add each
Fact to the HashSet using the attributes as keys. I suppose it would have
to be a nested set since I can't define a multi-valued key class within a
rule. I could then handle this HashSet in a RHS block. However, I realize
that I'm completely subverting the whole rule language…
Any suggestions?
Thanks,
Mike
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