Do you mean you have a method which wants to know which method has invoked it?
I don't think that you are actually supposed to do that; the idea of a supplier class with public methods is that it is available to all objects without prejudice and without knowing whom it is serving. Bit like a bus; anybody can travel as long as they pay for their ticket, without the driver asking their name!
Ruth Stout was famous for gardening naked. Just like this tiny ad:
a bit of art, as a gift, the permaculture playing cards