[rules-users] Is there a better way?

[Edson Tirelli]

   Dirk,

   This should work:

$rli_list : RecordSet( this != $npi.relatedRLIs )

  If it is not working, may I ask you please to open a JIRA?

  []s
  Edson


2008/1/25, Dirk Bergstrom <dirk at juniper.net>:
>
> I collect objects of type RLI that are related to instances of type NPI,
> and
> "attach" them to their NPIs, and (in a later agenda group) collect subsets
> of
> RLIs based on attributes of RLIs, NPIs, and other objects.  In the first
> agenda
> group, I need to update() the NPI object after the new list of RLIs is
> attached,
> but I only want to do this when a *new* list is attached.
>
> The only way I can find to do this requires an eval.  Is there a better
> way?
>
> Here's the rule that I have now.  This works:
>
> rule "RLIs for NPI"
> agenda-group "010"
> lock-on-active true
> salience 50
> when
> $npi : NPIRecord( )
> $rli_list : RecordSet( eval( ! $rli_list.equals($npi.getRelatedRLIs())) )
> from
>   collect( RLIRecord( npi_program == $npi.synopsis ) )
> then
> $npi.setRelatedRecords($rli_list, DataSource.RLI);
> update($npi);
> end
>
> I'd like to write something like this:
>
> ...
> $rli_list : RecordSet( $rli_list != $npi.relatedRLIs ) from
> ...
>
> But that doesn't compile.  To get around that, I added a method called
> getContents to RecordSet that just returns "this", so I could write:
>
> ...
> $rli_list : RecordSet( contents != $npi.relatedRLIs ) from
> ...
>
> But that always returns true.  Best I can tell, it gets compiled into an
> inequality test, as opposed to a call to equals(), and the new list is
> never the
> same object as the old list, even though they may have the same contents.
>
> I also tried this (setRelatedRecords returns true if the list is
> different):
>
> ...
> then
> $npi.setRelatedRecords($rli_list, DataSource.RLI) && update($npi);
> end
>
> But that won't compile at all.
>
> --
> Dirk Bergstrom               dirk at juniper.net
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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