[rules-users] Is there a "extends" for the "declare" of a new type?

[Mark Proctor]

This is what's in the unit test "test_ExtLegacy.drl":
declare BetterLegacy extends LegacyBean
     // novel field
     oneMoreField  : String = "Hello"

     // inherited fields redeclared to set initial value
     doubleField  : Double    = 3.3                @position(1)  // tag 
inherited field, will be 1st field
     strField : String = "XX"
     intField : int = 245
     prop : boolean = true
     // objField is not redeclared
end

and this one "test_Extends.drl"
declare Person
     age  : int     = 99          @position(2)
     name : String  = "john doe"  @key    @position(1)
end

declare Student extends Person
     school : String @key   @position(3)
end


declare LongTermStudent extends Student
     years : int @key @position(5)
     course : String @position(4)
end


On 28/05/2011 18:22, Wolfgang Laun wrote:
> It doesn't work:
>
>    declare Customer extends Person
>
> is declined with
>
>    Cannot extend supertype 'date.cust.Person' (not a declared type)
>
> -W
>
> 2011/5/28 Edson Tirelli <ed.tirelli at gmail.com 
> <mailto:ed.tirelli at gmail.com>>
>
>
>        Wolfgang,
>
>        I think Davide's implementation supports extending existing
>     java classes... did you tried? What is not possible is to
>     implement interfaces, since you can't define methods in the
>     declare statement.
>
>        Edson
>
>
>     2011/5/28 Wolfgang Laun <wolfgang.laun at gmail.com
>     <mailto:wolfgang.laun at gmail.com>>
>
>         There is, since 5.2.0, the option of extending a class
>         declared in DRL:
>
>         declare A
>            i : int
>         end
>
>         declare B extends A
>           ...
>         end
>
>         Any class origninating from Java code cannot be extended  in DRL.
>
>         -W
>
>
>
>         On 28 May 2011 10:56, Tomas Olsson <tol at sics.se
>         <mailto:tol at sics.se>> wrote:
>
>             Hi,
>             I have tried to look this up but cannot find any clear
>             answer on the web.
>             Does drools support extension of existing classes for new
>             type declarations?
>             That would be very nice if this would be possible.
>
>             /Tomas
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>
>
>
>     -- 
>       Edson Tirelli
>       JBoss Drools Core Development
>       JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
>
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