public IceCreamOrder addBall(final Flavor ballFlavor) {
    final Integer ballCount = balls.containsKey(ballFlavor) ? balls.get(ballFlavor) + 1 : 1;
    balls.put(ballFlavor, ballCount);
    return this;
  }
Give me some ice-cream! :p

@author Alexei KLENIN
vertx/feign-vertx/src/test/java/feign/vertx/testcase/domain/IceCreamOrder.java