How could I inject new buil-iin constructors / objects to nashorn?

[Lev Serebryakov]

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 I'm writing some framework in Java, and want to use JavaScript as
glue/DSL language for it (think about GNU Radio with C++ core classes
and Pythjon glue, for example).

 This framework contains meta-model for its classes and objects,
implemented as Java annotations. It helps to generate different
boilerplate code automatically and hide some tedious technical details
from framework's users.

 I want to export this meta-model to JavaScript (Nashorn) in most
efficient and JavaScript-idiomatic way. That is, I need built-in-like
constructors and objects, which is not exact reflection of Java
classes and objects, but reflection of my meta-model. Also, I want to
do it in runtime, not compile-time, as new classes (modules) for my
framework could be added by user and I don't want to force any
pre-processors and additional build steps. Of course, I could generate
code in runtime with ASM (it is used in framework anyway).

 What is proper way to do this? All documentation and examples shows
how to use Java classes and objects from JavaScript executed by
Nashorn, but it is direct mapping. Is here any good way to wrap my
meta-model for Nashorn to make it looks as JavaScript-native as
JavaScript's Number or String or Array?

 Other feature I want to have is to provide users way to implement new
modules (classes) for this framework, but without all these
annotations. Again, most samples shows how to make "Anonymous" class
in JavaScript (like "var i = new new java.util.Iterator({ ...});")
which looks not very JavaScript-friendly...

 Sorry, if this list is not suitable for such questions, but I cannot
find any other Nashorn-related mailing list and can not google answer
to my question on Internet, as all posts and articles about Nashorn
are very superficial.

- -- 
// Black Lion AKA Lev Serebryakov
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