determine which property is calling from script using single getter function

[buddhi mihara]

hi,i need to sent a javascript object to the scripting environment when i calling a global object.let say var foo = Pro.bind('natives')   -   (as a return type i will get a javascript object)
and i follow the structure of jdk.nashorn.internal.objects.PrototypeObject; but the different is i am adding Properties to the PropertyMap at the run time(but in the script it was hardcoded).i using a for loop and reading data form hashmap and add them to prototype map.
but i wrote only one methodhandle function for all of those properties.(but in the PrototypeObject there are setters and getters for each property eg:GET_CONSTRUCTOR,SET_CONSTRUCTOR)is it possible to write like that.if it so in the runtime how can i find which property is calling form the script.