code: @Nonnull
    public static <KEYTYPE, VALUETYPE> Enumeration <Map.Entry <KEYTYPE, VALUETYPE>> getEnumeration (@Nullable final Map <KEYTYPE, VALUETYPE> aMap)
    {
      if (aMap == null)
        return new EmptyEnumeration <> ();
      return getEnumeration (aMap.entrySet ());
    }
docs: Get an Enumeration object based on a Map object.
  
  @param <KEYTYPE>
  map key type
  @param <VALUETYPE>
  map value type
  @param aMap
  map object to use
  @return an Enumeration object