Exposing Java Enums in the Rhino JavaScript engine

Question

I'm writing a program that incorporates the Rhino Scripting Engine. I would like to be ale to expose a couple of the program's enums, but I can't figure out how to do that, if it's even possible. Is there a way to make a java enum usable in the scripts?

Answer 1

Do you mean to use a java Enum from a script, which will be converted to Java by Rhino?. If this is the case, you could do something like:

• given a java class with an Enum:

  package com.stackoverflow.example;
  public class Order {
  
      private String field;
      private By by;
  
      public enum By {
          ASC, DESC
      }
  
      public Order(String field, By by) {
          this.field = field;
          this.by = by;
      }
  }
  

• and in the script you can do

  // Importing class with enum
  importClass(Packages.com.stackoverflow.example.Order);
  
  // Instancing a new Order object using the existing enum in the Order class
  var order = new Order("db_field", Order.By.DESC);
  

I hope it helps.