/**
   * 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 Object getDefaultValue(Class<?> hint) {
   Object value;
   if (hint == null) {
     if (javaObject instanceof Boolean) {
       hint = ScriptRuntime.BooleanClass;
     }
   }
   if (hint == null || hint == ScriptRuntime.StringClass) {
     value = javaObject.toString();
   } else {
     String converterName;
     if (hint == ScriptRuntime.BooleanClass) {
       converterName = "booleanValue";
     } else if (hint == ScriptRuntime.NumberClass) {
       converterName = "doubleValue";
     } else {
       throw Context.reportRuntimeError0("msg.default.value");
     }
     Object converterObject = get(converterName, this);
     if (converterObject instanceof Function) {
       Function f = (Function) converterObject;
       value = f.call(Context.getContext(), f.getParentScope(), this, ScriptRuntime.emptyArgs);
     } else {
       if (hint == ScriptRuntime.NumberClass && javaObject instanceof Boolean) {
         boolean b = ((Boolean) javaObject).booleanValue();
         value = ScriptRuntime.wrapNumber(b ? 1.0 : 0.0);
       } else {
         value = javaObject.toString();
       }
     }
   }
   return value;
 }