[rules-users] Is there a better way?
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(a)juniper.net
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