morning_facade_example.dart

// Morning Facade Example
class Grinder {
  String _type;

  Grinder(this._type);
  void grind() => print("Grinding $_type!");
}

class Maker {
  String _type;

  Maker(this._type);
  void fill() => print("Filling the $_type maker!");
  void retrieve() => print("Retrieving the $_type!");
  void start() => print("Starting the $_type maker!");
}

class Imbiber {
  String _beverage;

  Imbiber(this._beverage);
  void drink() => print("Mmmmm...drinking $_beverage!");
}

class MorningFacade {
  final _coffeeDrinker = Imbiber("coffee");
  final _coffeeGrinder = Grinder("coffee beans");
  final _coffeeMaker = Maker("coffee");

  void prepareCoffee() {
    print("\r\nPreparing the coffee...");
    _coffeeGrinder.grind();
    _coffeeMaker
      ..fill()
      ..start();
    print("Coffee is brewing!\r\n");
  }

  void drinkCoffee() {
    print("\r\nMust...have...coffee...");
    _coffeeMaker.retrieve();
    _coffeeDrinker.drink();
    print("This is damn fine coffee!");
  }
}

void main() {
  var typicalMorning = MorningFacade();

  print("Wake up! Grab a brush and put on a little makeup...");
  print("\r\nStumble to the kitchen...");

  typicalMorning.prepareCoffee();
  print("Oh my...that smells good...");

  typicalMorning.drinkCoffee();
  print("\r\nI'm ready to attack the day!");
}