[rules-users] Custom operator

[Edson Tirelli]

    The instantiation is done automatically, based on configuration or
API call. More details in here:

http://blog.athico.com/2010/06/creating-pluggable-oprators.html

    But basically, for eclipse to pick it up, best to add to a
configuration file:

drools.evaluator.MyIdentifierForMyOperators = my.pkg.MyEvaluatorDefinition

    Please note that all drools operators are implemented like that
and wired through configuration file as seen here:

https://svn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/main/resources/META-INF/drools.default.packagebuilder.conf

    So, adding your own custom operators is no different. Just define
your own configuration file in the META-INF directory of your
application package and it will work.

    Edson

2010/10/25 Swindells, Thomas <TSwindells at nds.com>:
> For that to work the class also needs to be instantiated - ie it would only get created once something in eclipse has touched the class.
>
> Thomas
>
>> -----Original Message-----
>> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
>> bounces at lists.jboss.org] On Behalf Of Edson Tirelli
>> Sent: 25 October 2010 14:58
>> To: Rules Users List
>> Subject: Re: [rules-users] Custom operator
>>
>>    If you look at the implementation of one of the existing operators
>> (e.g. MatchesEvaluatorDefinition) you will see this in the beginning
>> of the class:
>>
>> public static final Operator  MATCHES       =
>> Operator.addOperatorToRegistry( "matches", false );
>>
>>    Do the same on your own implementations and it should be fine.
>>
>>     Edson
>>
>>
>>
>> 2010/10/25 Bruno Freudensprung <bruno.freudensprung at temis.com>:
>> >
>> > Hello,
>> >
>> > It seems that the logic behind the "operator" drop-down list comes from
>> > the
>> > "org.drools.ide.common.client.modeldriven.SuggestionCompletionEngine"
>> > and "org.drools.eclipse.rulebuilder.modeldriven.HumanReadable" classes.
>> > That's for the "rule authoring" perspective.
>> > I've also seen that the business rule editor involves the DrlParser
>> > class. So, in a "rule parsing" perspective, I guess I need to find a way
>> > to register my custom operator into the EvaluatorRegistry used by the
>> > Eclipse plugin (and I don't know where this can be done).
>> >
>> > Do you think I am on the right track? Is there a risk that code
>> > modifications will involve so many classes that, in the end, adding a
>> > custom operator to the business rule editor will be a difficult task for
>> > someone very new to Drools (like me)?
>> >
>> > Thanks in advance,
>> > Best regards,
>> >
>> > Bruno.
>> >
>> > Bruno Freudensprung a écrit :
>> >> Hello,
>> >>
>> >> I'd like to implement a custom "lucenematches" operator that would
>> >> enable writing conditions like:
>> >> $d : Doc(text lucenematches "(foo AND bar) OR roam~0.8")
>> >>
>> >> As I've taken a look at the following post on athico
>> >> (http://blog.athico.com/2009/05/imperfect-evaluations.html), and seen
>> >> that the appendix B of the "Drools JBoss Rules 5.0 Developer's Guide"
>> >> book that deals with custom operators, I am rather confident that I will
>> >> find my way in implementing my operator (if not, I'll post here again :-)).
>> >>
>> >> However, I wonder if it will be possible to add my "lucenematches"
>> >> operator to the "operator" drop-down list of the Eclipse's Business Rule
>> >> Editor.
>> >> Does anyone have an idea?
>> >>
>> >> Best regards,
>> >>
>> >> Bruno.
>> >> _______________________________________________
>> >> rules-users mailing list
>> >> rules-users at lists.jboss.org
>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>
>> >>
>> >
>> > _______________________________________________
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>> > rules-users at lists.jboss.org
>> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >
>>
>>
>>
>> --
>>   Edson Tirelli
>>   JBoss Drools Core Development
>>   JBoss by Red Hat @ www.jboss.com
>>
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>
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com