if(this.tokens.get(game)==null){
this.tokens.put(game, new EnumMap<TransportationMethod, Token>(TransportationMethod.class));
}
// create new token and add it
final Token token = new TokenImpl(this,transportation);
token.setNumberOfTickets(numberOfTickets);
this.tokens.get(game).put(transportation, token);
//to make sure we got everything right
final Token tokens = this.tokens.get(game).get(transportation);
boolean result;