[rules-users] Guvnor and drools implementation - questions

Thu Mar 3 07:32:20 EST 2011

"Maps.properties" is just a name I choose for the enumeration. You can use
whatever identifier you want, but..... The identifier has to be of the form
<string>.<string>. It has to have a dot (.). I think this is because
enumeration were created for bind a fact type attribute to a list of values.

Best Regards,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com

2011/3/3 Vincent Legendre <vincent.legendre at eurodecision.com>

>  I don't think that enums needs to be linked to a Pojo attribute. To me it
> is just an identifier used in ENUM DSL constraints. The 'properties' is not
> an attribute of a Map. I think you could set it to whatever you like
> (something more linked to your problem).
>
> For making that dynamic, it is explained in the guvnor doc<http://drools.herod.net/drools-guvnor/html_single/index.html>(chapter "1.4.2.4.8. Data enumerations (drop down list configurations)" )
>
> 'Person.age' : (new com.yourco.DataHelper()).getListOfAges()
>
>
> But I never tried that.
>
>
> Le 02/03/2011 14:06, ioda100 a écrit :
>
> Really thank you, it's working fine. I will see if it's working for my more
> difficult case.
>
>
> On Tue, Mar 1, 2011 at 11:28 PM, Esteban [via Drools - Java Rules Engine]
> <[hidden email]<http://user/SendEmail.jtp?type=node&node=2613230&i=0&by-user=t>
> > wrote:
>
>>  You need to create the DSL first.
>> Follow these steps:
>> 1.- Add java.util.Map to package imports (I think you already did this)
>> 2.- Create a new Enumeration with the following content:
>> *'Map.properties': ['prop1', 'prop2', 'prop3']*
>> 3.- Create a new DSL with this content:
>> *[when]The property {key:ENUM:Map.properties} of the map is
>> {value}=Map((this["{key}"] == "{value}"))*
>> 4.- Create a new Rule and add the DSL sentence to the WHEN part. You
>> should see the drop down.
>>
>> Note the name of the enumeration and how the variable {key} is defined in
>> the DSL. I think you can also read the enumerations from a Java Enum present
>> on your model, but I'm not sure about it. Does anyone know about this?
>>
>>  Best Regards,
>>
>> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>>
>> Esteban Aliverti
>> - Developer @ http://www.plugtree.com
>> - Blog @ http://ilesteban.wordpress.com
>>
>>
>>  2011/3/1 ioda100 <[hidden email]<http://user/SendEmail.jtp?type=node&node=2607065&i=0>
>> >
>>
>>> Yes but for this i will be obliged to create a POJO of an object. And for
>>> attributes of that object in DSL i can define values that can take this
>>> attribute?
>>>
>>> Maybe i don't understand but i don't see how to do with this.
>>>
>>> My case :
>>> I have Maps in the session. Each Map has for example 5 properties
>>> ("prop1", "prop2", "prop3", "prop4", "prop51") and the value is a string.
>>> The Map is Map<String, Object> but generally Object is a String.
>>> So in the When clause i have something like that :
>>>     $m  : Map((this["prop1"] == "test1"))
>>> I have included java.utils.Map in Guvnor. So when i add a when clause i
>>> can choose Map in the list but impossible to have "prop1" to "prop5" in a
>>> drop down list for attributes of the Map.
>>> Would it be possible to create a Pojo for Map or would it be in conflict
>>> with the Map of Java?
>>>
>>> Thank you for your time
>>>
>>>
>>> Le 1/03/2011 17:55, Vincent Legendre [via Drools - Java Rules Engine] a
>>> écrit :
>>>
>>>  Le 01/03/2011 15:39, ioda100 a écrit :
>>>
>>> Thanks for your quick answer Esteban.
>>>
>>> 1) Ok i will have a look at DSL. In fact in my map i know all the
>>> properties (about 200). It would be cool to be able to have a drop down list
>>> with all these attributes as when we do it with objects for which we gave
>>> Pojo to Guvnor.
>>>
>>> You can define enumerations for a particular attribute.
>>> Inside a DSL you can constrain a placeholder with that enumeration.
>>> And finally, enums can be static, or dynamic (a interface to implement
>>> that returns a list of values).
>>>
>>> search the Guvnor's doc in these chapters
>>> 1.4.2.4.8. Data enumerations (drop down list configurations)
>>>
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