Where do I find more info on new LocalLBNodeAddressLocator().getLocalLBNodeAddressPort()?

Where do I find more documentation on new LocalLBNodeAddressLocator().getLocalLBNodeAddressPort()? I was not able to find it in DevCentral. Any pointers are appreciated!

Also, would the following piece of code be the most optimal way of looking up an hostname from a node's IP address?

LocalLBNodeAddressBindingStub f5_na_obj = (LocalLBNodeAddressBindingStub) new LocalLBNodeAddressLocator().getLocalLBNodeAddressPort(); String hostname = f5_na_obj.get_screen_name(new String[] {"192.168.1.1"})[ 0 ];