/*
 * AccessJavaVariable.java
 *
 * Copyright 2006 Sun Microsystems, Inc. ALL RIGHTS RESERVED Use of 
 * this software is authorized pursuant to the terms of the license 
 * found at http://developers.sun.com/berkeley_license.html .
 *
 */

package com.sun.demo.scripting;
import java.util.ArrayList;
import java.util.List;
import javax.script.*;

/**
 * This example shows how to invoke specific methods in a script. It 
 * also shows how a script can access objects in the Java environment.
 *
 * @author John O'Conner
 */
public class AccessJavaVariable {
    
    /** Creates a new instance of AccessJavaVariable */
    public AccessJavaVariable() {
        mgr = new ScriptEngineManager();
        jsEngine = mgr.getEngineByName("javascript");
        invocableEngine = (Invocable) jsEngine;
    }

    void run() {
        List<String> namesList = new ArrayList<String>();
        namesList.add("Jill");
        namesList.add("Bob");
        namesList.add("Laureen");
        namesList.add("Ed");
        System.out.println("Executing in script environment...");
        try {
            jsEngine.eval("function printNames2() {" +
                          "  var x;" +
                          "  var names = namesListKey.toArray();" +
                          "  for(x in names) {" +
                          "    println(names[x]);" +
                          "  }" +
                          "}" +

                          "function printNames1(namesList) {" +
                          "  var x;" +
                          "  var names = namesList.toArray();" +
                          "  for(x in names) {" +
                          "    println(names[x]);" +
                          "  }" +
                          "}" +

                          "function addName(namesList, name) {" +
                          "  namesList.add(name);" +
                          "}"
                );
            invocableEngine.invokeFunction("printNames1", namesList);
            invocableEngine.invokeFunction("addName", namesList, "Dana");
            jsEngine.put("namesListKey", namesList);
            invocableEngine.invokeFunction("printNames2");
                
        } catch (ScriptException ex) {
            ex.printStackTrace();
        } catch (NoSuchMethodException ex) {
          ex.printStackTrace();
        }
        
        System.out.println("Executing in Java environment...");
        for (String name: namesList) {
            System.out.println(name);
        }
        
        
    }
    
    public static void main(String[] args) {
        new AccessJavaVariable().run();
    }
    
    private ScriptEngineManager mgr;
    private ScriptEngine jsEngine;
    private Invocable invocableEngine;
}