Could not set static function to a variable in R

[gaocegege]

Hi, I am using renjin to implement R Language mode for Processing. And I find a issue:

There is a function in RLangPApplet:

class RLangPApplet {
  static public final float radians(float degrees) {
    return degrees * DEG_TO_RAD;
  }
}

And I put a RLangPApplet instance into R context by this.renjinEngine.put("processing", instance); When I call processing$radians, it works. But when I run radians = processing$radians, it raises an error: https://pastebin.com/Lxzh4Bb2

FYI: When I do:

import(rprocessing.RLangPApplet)
radians = RLangPApplet$radians

It works again. I am wondering if there is a bug or I miss something.

[akbertram]

Your "radians" method is a static java method. If you want only to expose the static methods in RLangPApplet, then you use the following instead:

this.renjinEngine.put("processing", RLangPApplet.class);

On the other hand, it's pretty reasonable to expect to be able to access static methods/fields via an instance, so we should probably fix this in Renjin.

[jeremydouglass]

On the other hand, it's pretty reasonable to expect to be able to access static methods/fields via an instance, so we should probably fix this in Renjin.

In order to access static methods/fields via an instance in Renjin -- what would it take? Should this be filled as a separate issue / feature request; would it require significant development effort?

[akbertram]

I think this should not be too difficult. Take a look at the class in the org.renjin.invoke.reflection package to get started.

If you're interested in us implementing it for you, consider our Renjin Enterprise Support package!

[jeremydouglass]

Take a look at the class in the org.renjin.invoke.reflection package to get started.

Many thanks!