static void Main(string[] args)
{
/*
* More info: https://en.wikipedia.org/wiki/Decorator_pattern
* What problems can the Decorator design pattern solve?
* Responsibilities should be added to (and removed from) an object dynamically at run-time.
* A flexible alternative to subclassing for extending functionality should be provided.
*
* When using subclassing, different subclasses extend a class in different ways.
* But an extension is bound to the class at compile-time and can't be changed at run-time.
*/
void PrintInfo(ICoffee coffee) => Console.WriteLine("Cost: " + coffee.GetCost() + "; Ingredients: " + coffee.GetIngredients());
ICoffee c = new SimpleCoffee();
PrintInfo(c);
c = new CoffeeWithMilk(c);
PrintInfo(c);
c = new CoffeeWithSprinkles(c);
PrintInfo(c);
var coffeeWithMilk = new CoffeeWithMilk(new SimpleCoffee());
PrintInfo(coffeeWithMilk);
}
static void Main(string[] args)
{
ICoffee simpleCoffee = new SimpleCoffee();
Console.WriteLine("Simple coffee:");
Console.WriteLine("cost: " + simpleCoffee.getCost());
Console.WriteLine("ingredients: " + simpleCoffee.getIngredients());
ICoffee coffeeWithSugar = new CoffeeSugarDecorator(simpleCoffee);
Console.WriteLine("Coffee with sugar:");
Console.WriteLine("cost: " + coffeeWithSugar.getCost());
Console.WriteLine("ingredients: " + coffeeWithSugar.getIngredients());
ICoffee coffeeWithSugarAndMilk = new CoffeeMilkDecorator(coffeeWithSugar);
Console.WriteLine("Coffee with sugar and milk:");
Console.WriteLine("cost: " + coffeeWithSugarAndMilk.getCost());
Console.WriteLine("ingredients: " + coffeeWithSugarAndMilk.getIngredients());
}
static void Main(string[] args)
{
var myCoffee = new SimpleCoffee();
Console.WriteLine($"{myCoffee.GetCost():c}"); // $ 5.00
Console.WriteLine(myCoffee.GetDescription()); // Simple Coffee
var milkCoffee = new MilkCoffee(myCoffee);
Console.WriteLine($"{milkCoffee.GetCost():c}"); // $ 6.00
Console.WriteLine(milkCoffee.GetDescription()); // Simple Coffee, milk
var whipCoffee = new WhipCoffee(milkCoffee);
Console.WriteLine($"{whipCoffee.GetCost():c}"); // $ 7.00
Console.WriteLine(whipCoffee.GetDescription()); // Simple Coffee, milk, whip
var vanillaCoffee = new VanillaCoffee(whipCoffee);
Console.WriteLine($"{vanillaCoffee.GetCost():c}"); // $ 8.00
Console.WriteLine(vanillaCoffee.GetDescription()); // Simple Coffee, milk, whip, vanilla
Console.ReadKey();
}