[rules-users] Is there a "extends" for the "declare" of a new type?
Mark Proctor
mproctor at codehaus.org
Sat May 28 19:35:37 EDT 2011
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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