new Java objects in JavaScript

rhino_new.js

import javax.script._

class foo(s: String)

// call Class.forName not in JavaScript.
// calling Class.forName in JavaScript does not work.
object ClassForName {
  def apply(className: String) = Class.forName(className)
}

object GetClass {
  def apply(x: AnyRef) = x.getClass
}

object Rhino {
  def main(args: Array[String]) {
    val engine = new ScriptEngineManager(null).getEngineByName("JavaScript")
    engine.put("class_for_name", ClassForName)
    engine.put("get_class", GetClass)

    try {
      engine.eval("""
function construct(class_name) {
  var class_obj = class_for_name.apply(class_name)

  return function() {
    // convert arguments object to array
    var args = new Array(arguments.length)
    for (var i = 0; i < args.length; ++i) {
      args[i] = arguments[i]
    }

    var argumentClasses = new Array(args.length)
    for (var i = 0; i < args.length; ++i) {
      argumentClasses[i] = get_class.apply(args[i])
    }

    var constructor = class_obj.getConstructor(argumentClasses);
    return constructor.newInstance(args)
  }
}

var s = construct("foo")("abc");
print(s)
""")
    } catch {
      case e => println(e)
    }
  }
}