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

[Sundararajan Athijegannathan]

Hi,

You may want to look at JSObject 
(https://docs.oracle.com/javase/8/docs/jdk/api/nashorn/jdk/nashorn/api/scripting/JSObject.html, 
https://docs.oracle.com/javase/8/docs/jdk/api/nashorn/jdk/nashorn/api/scripting/AbstractJSObject.html)

Simple example here -> 
https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions#Nashornextensions-jsobject

If you want to do it in script itself (perhaps pre-loaded script for 
your model),  you can use JSAdapter.

Simple example here ->
https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions#Nashornextensions-JSAdapterconstructor

Hope this helps,
-Sundar

On 9/24/2015 9:03 PM, Lev Serebryakov wrote:
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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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