[rules-users] Guvnor and drools implementation - questions

[Esteban Aliverti]

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 <eddyhautot at gmail.com>

> 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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