Reversing a HashMap from Map to Map>

Question

Is there a more elegant/built-in way to reverse the keys and values of a Hashmap?

I currently have the following.

private Map

        

Answer 1

Guava's BiMap already provides a method for reversing its key-value pairs. Perhaps you could change the interface of the Map in question to BiMap, or else use the following code:

private BiMap reverseMap(Map permissions) {
   BiMap bimap = HashBiMap.create(permissions);
   return bimap.inverse();
}