Subj : Re: [Rhino] Inheritance
To   : netscape.public.mozilla.jseng
From : igor@icesoft.no (Igor Bukanov)
Date : Thu Jan 09 2003 02:59 am

"Todd Trimmer" <babyNO.EVIL.SPAMduck@usa.com> wrote in message news:<avfisp$rif2@ripley.netscape.com>...
> 1) defineClass won't work on an abstract class
> 2) If I have java.Derived extends java.Base:
>   A. I want js.Derived
>   B. I don't want js.Base to exist. Period. Not even for a prototype.
>   C. I want java.Derived to silently pull inherited methods from java.Base
> into its js.Derived signature.
> 3) defineClass using getMethods instead of getDefinedMethods achieves
> exactly what I describe above.

You can file a new bug at bugzilla.mozilla.org, where you should
select Rhino as a component name and mark it as enhancement.

> 
> How do I do:
> 
> ScriptableObject.defineClass(scope, Base.class);
> ScriptableObject.defineClass(scope, Derived.class);
> Scriptable baseProto = ScriptableObject.getClassPrototype(scope,
> base-js-class-name);
> Scriptable derivedProto = ScriptableObject.getClassPrototype(scope,
> derived-js-class-name);
> derivedProto.setPrototype(baseProto);
> 
> 
> But inside the javascript shell? This doesn't work:

You can export a new method to the shell with necessary Java code or
use __proto__ field to alter prototype chain of the already created JS
object, like in:
Derived.prototype.__proto__ = Base.protoype;
which is an extension to EcmaScript.

Note that when you assign 
Derived.prototype.prototype = Base.protoype;
you does not change the prototype chain, you just define new property
called "prototype" in Derived.prototype object.

Regards, Igor

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