Re: [rules-users] Is there a "extends" for the "declare" of a new type?
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(a)gmail.com
<mailto:ed.tirelli@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(a)gmail.com
<mailto:wolfgang.laun@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(a)sics.se
<mailto:tol@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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