[rules-users] Adding a custom operator to drools?

[Edson Tirelli]

   It depends if you are talking about Drools 4 or 5. You are right about
Drools 4. Drools 5 has "quasi-pluggable" operators... hehehe :)

   It has an interface you can implement to add operators and the parser
accepts a quote for custom operators. It is not yet the way I want it to be
for Drools 5 final, but it works already.

   For more info, look at the EvaluatorDefinition interface in Drools 5 and
its several implementations for examples.

   []s
   Edson

2008/9/11 Michael Zimmermann <list at incunabulum.de>

> Hi there,
>
> you might see this as a follow up to a discussion named "Query by
> Example" a couple of days ago, see here:
> http://lists.jboss.org/pipermail/rules-users/2008-September/006520.html
>
> Question to the devs:
> Having looked through the code, adding support for a custom operator
> requires
> - changing the DRL.g
> - regenerating the DRLLexer and DRLParser classes from this grammar
> - changing the XyzEvaluator and related classes in
>  org.drools.base.evaluators.
>
> If I skip MVEL, the BRMS and other places like decision tables for now,
> is this all to expand the DRL syntax? Or are any further steps required
> to connect the grammar with the "java logic"?
>
> Thanks!
>
> Michael
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>



-- 
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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