Subj : Re: creating JS objects in Java...?
To   : netscape.public.mozilla.jseng
From : Igor Bukanov
Date : Thu Feb 17 2005 06:36 pm

user@domain.invalid wrote:
> So, if I use the JavaAdapter to make c new javascript class that 
> inherits from another class an implements a few interfaces, if I use the 
> Rhino API to get a hold of that object in Java, can I use it right then 
> and there as an object of those interface types?  Or do I have to use it 
> as such only in the JS context?
> 
> Here's what I want to do:  I have an engine that takes Module objects. 
> Many of these Module objects have been overwritten in Java - 
> EmailModule, etc.  I would like to be able to have the user author his 
> own Module using JavaScript, using, presumably, the JavaAdapter.
> 
> This authoring is done in a little gui.  Say that I have an interface 
> Foo which has an method Bar() that I want to overwrite.  So, in this gui 
> he writes "function Bar(){print("HelloWorld");}".  Now, -in Java- how do 
> I make this Module object with this code overloading the superclass 
> method Bar() such that I then have a Java Module object that I can pass 
> around my Java API?
> 
> Basically, I want a Java function (not a JS function) like this:
> 
> public Module BuildSubclass(String[] superclasses, String iBarJSCode, 
> String iSomeOtherMethodJSCode,...)
> {
>     Module m = new JavaAdapter(superclasses, iBArJSCode, 
> iSomeOtherMethodJSCode);
> 
> return m;
> }
> 
> Now I have a Module object that extends or implements an arbitrary 
> number of classes or interfaces and who has various overloaded methods.
> 
> 
> How do I do this? I would be incredibly grateful for some help.

Use class compiler,
http://www.mozilla.org/rhino/apidocs/org/mozilla/javascript/optimizer/ClassCompiler.html
to compile you class to bytecode sublassing the desired class, load the 
generated bytecode into a class loader and instantiate the resulting class.

Regards, Igor

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