code: public static <K, V> KeyValueSource<K, V> fromMultiMap(MultiMap<? super K, ? extends V> multiMap) {
          return new MultiMapKeyValueSource<K, V>(multiMap.getName());
      }
docs: A helper method to build a KeyValueSource implementation based on the specified {@link MultiMap}
  
  @param multiMap multiMap to build a KeyValueSource implementation
  @param <K>      key type of the multiMap
  @param <V>      value type of the multiMap
  @return KeyValueSource implementation based on the specified multiMap