I was following almost literally the example given in the "Drools Introduction", Section 2.1.1.4., Type Declaration 'extends'.
It appears that Drools is very similar to Eleusis<http://en.wikipedia.org/wiki/Eleusis_%28card_game%29>;-) -W 2011/5/29 Mark Proctor <[email protected]> > > 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 <[email protected]> >> >> 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 <[email protected]> >>> >>> 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 <[email protected]> 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 >>>> _______________________________________________ >>>> rules-users mailing list >>>> [email protected] >>>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >>> >>> _______________________________________________ >>> rules-users mailing list >>> [email protected] >>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >> >> >> >> -- >> Edson Tirelli >> JBoss Drools Core Development >> JBoss by Red Hat @ www.jboss.com >> >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users >
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