Using Rhino to invoke a javascript function (compiled to a java .class file) in Java code

[Ali Beyad]

Hi all,

 

I am new to Rhino and the documentation on the website and the newsgroups that I searched did not yield me the answer I was looking for, so I am posting here.  I am sorry if this question has already been asked before.

 

I have a very basic problem which I couldn’t find documentation on how to solve.  I am simplifying the example here.  Suppose I have a JS file with the following content:

 

// jscode.js

function add(v1, v2)

{

            return v1+v2;

}

function subtract(v1, v2)

{

            return v1-v2;

}

 

I used Rhino to compile this JS script to a Java .class file with the following command:

java –classpath rhino.jar;. org.mozilla.javascript.tools.jsc.Main jscode.js

 

This produced for me a Java class file called “jscode.class”.

 

Now I want to be able to invoke the two functions in this javascript code “add” and “subtract”, but from my Java application.  That is, I want to be able to do something like the following:

 

public class TestJSCode

{

            public static void main(String[] args)

            {

                        Context cx = Context.enter();

                        try

                        {

                                    Scriptable scope = cx.initStandardObjects();

                                    // use the scope and context to invoke the add or subtract functions that are in jscode.js and obtain the result

                        }

                        catch ( Exception ex )

                        {

                                   

                        }

                        finally

                        {

                                    Context.exit();

                        }

            }

}

 

 

However, I am not sure how to proceed with using the scope and context to invoke the “add” and “subtract” functions that I have in my jscode.js file.  I saw on the Rhino documentation page how to do this by passing in the entire JS application as a string to the context.executeString() call, but I don’t see how to do that with a script that has been compiled to a java class file.

 

Any help or sample code would be much appreciated.

 

Thank you very much,

Ali

 

[ahj...@gmail.com]

i'm also figuring this out..
can someone please enlightened me too?

[brains...@inbox.ru]

My first result:

######## First.js ################

function testFunc2() {
return "Func2!";
}
####### FirstWrapper.java #################

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.Scriptable;
import org.COMPANY.First; //my compiled class
...

Context cx = Context.enter();
Scriptable scope = cx.initStandardObjects();

// create compiled script object
Script f = new First();
//I don't know how to load object, but exec loads it. Any ideas?
f.exec(cx, scope);

Object obj = scope.get("testFunc2", scope);

if (obj instanceof Function) {
Function new_name = (Function) obj;
// call function, null - arguments
Object obj1 = new_name.call(cx, scope, scope, null);
System.out.println(obj1);
} else {
System.out.println("Error: This is not a function!");
}
########################################

I need any meanings...