[rules-users] Custom operator

Mon Oct 25 11:22:38 EDT 2010

Hi Edson,

Many thanks for you answer!
It is surprising that, on one hand, the 
"drools.default.packagebuilder.conf" file contains... :

    drools.evaluator.soundslike = 
org.drools.base.evaluators.SoundslikeEvaluatorsDefinition

... and on the other hand, EvaluatorRegistry.java contains:

   this.addEvaluatorDefinition( new SoundslikeEvaluatorsDefinition() );

and the source code for the Soundslike operator contains:

    public static final Operator  SOUNDSLIKE = 
Operator.addOperatorToRegistry( "soundslike", false );

All of this, at first sight, let me puzzled on how to really plug a 
custom operator. I'll give a try with the property file!

Any intuition ;-) of how difficult it might be to modify (besides 
SuggestionCompletionEngine and HumanReadable) the business rule editor 
Eclipse plugin for a "gentle" integration of the operator?

Best regards,

Bruno.

Edson Tirelli a écrit :
>     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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>>>>
>>>>         
>>>
>>> --
>>>   Edson Tirelli
>>>   JBoss Drools Core Development
>>>   JBoss by Red Hat @ www.jboss.com
>>>
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>>>       
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