/**
   * Utility method which dynamically binds a Context to the current thread, if none already exists.
   */
  public static Object callMethod(
      ContextFactory factory,
      final Scriptable thisObj,
      final Function f,
      final Object[] args,
      final long argsToWrap) {
    if (f == null) {
      // See comments in getFunction
      return Undefined.instance;
    }
    if (factory == null) {
      factory = ContextFactory.getGlobal();
    }

    final Scriptable scope = f.getParentScope();
    if (argsToWrap == 0) {
      return Context.call(factory, f, scope, thisObj, args);
    }

    Context cx = Context.getCurrentContext();
    if (cx != null) {
      return doCall(cx, scope, thisObj, f, args, argsToWrap);
    } else {
      return factory.call(
          new ContextAction() {
            public Object run(Context cx) {
              return doCall(cx, scope, thisObj, f, args, argsToWrap);
            }
          });
    }
  }
 public static Scriptable runScript(final Script script) {
   return (Scriptable)
       ContextFactory.getGlobal()
           .call(
               new ContextAction() {
                 public Object run(Context cx) {
                   ScriptableObject global = ScriptRuntime.getGlobal(cx);
                   script.exec(cx, global);
                   return global;
                 }
               });
 }