/// <summary>
/// # Motivation
/// I can now attach responsibilities to an object dynamically to add behaviour at runtime.
///
/// # Structure
/// Beverage
/// --> base class so all objects are of same type
/// CondimentDecorator : Bevarage
/// --> interchangeable with Beverage
///
/// # Sample Problem
/// A coffee shop wants to make an ordering system for all their drinks. Ofcourse there are a lot of combination with condiments/roasts.
/// We could create a base class and let all possible combinations inherit from the superclass and override their behaviour, but that would quickly become a mess.
///
/// # Solution
/// By creating a Decorator class which inherits from the baseclass (to effectively swap between types), I can now dynamically create composite objects at runtime.
/// To add a drink to the system:
/// 1. inherit from the base class, set instance fields in constructor
/// 2. override the 'Cost()' method to return desired cost
/// To add a condiment to the system:
/// 1. inherit from 'CondimentDecorator' (indirectly from base class as well
/// 2. add instance field from type Beverage
/// 3. initialize in constructor
/// 4. override GetDescription() and Cost() accordingly
/// To create a composite object at runtime:
/// 1. Create a new instance of a drink (Beverage)
/// 2. To add a condiment, assign the instance to a new instance of the condiment with itself as param
/// A. Beverage darkRoast = new DarkRoast();
/// B. darkRoast = new Mocha(darkRoast);
/// </summary>
public void Test()
{
Beverage beverage = new Espresso();
Console.WriteLine($"{beverage.GetDescription()} ${beverage.Cost()}");
Beverage beverage1 = new DarkRoast();
beverage1 = new Mocha(beverage1);
Console.WriteLine($"{beverage1.GetDescription()} ${beverage1.Cost()}");
Beverage beverage2 = new DarkRoast();
beverage2 = new Mocha(beverage2);
beverage2 = new Mocha(beverage2);
beverage2 = new Whip(beverage2);
Console.WriteLine($"{beverage2.GetDescription()} ${beverage2.Cost()}");
Beverage beverage3 = new HouseBlend();
beverage3 = new Soy(beverage3);
beverage3 = new Mocha(beverage3);
beverage3 = new Whip(beverage3);
Console.WriteLine($"{beverage3.GetDescription()} ${beverage3.Cost()}");
}
static void Main(string[] args)
{
Console.WriteLine("Strategy Pattern");
var modelDuck = new ModelDuck();
modelDuck.PerformFly();
modelDuck.PerformQuack();
modelDuck.SetFlyBehavior(new ModelFly());
modelDuck.PerformFly();
Console.WriteLine("Observer Patterns!");
var weatherData = new WeatherData();
var observerone = new OberverElement(weatherData);
observerone.Subscript();
var observertwo = new OberverOtherElement(weatherData);
observertwo.Subscript();
weatherData.SetMeasurementsChanged((float)35.50, (float)20.00, (float)264.00);
observerone.UnSubscript();
weatherData.SetMeasurementsChanged((float)37.50, (float)30.00, (float)260.00);
Console.WriteLine("Decorator Patterns");
var beverage = new Espresso();
Console.WriteLine(beverage.GetDescription());
BeverageBase beverage2 = new HouseBlend();
beverage2 = new Mocha(beverage2);
beverage2 = new Whip(beverage2);
Console.WriteLine(beverage2.GetDescription() + "$" + beverage2.Cost());
}
static void Main(string[] args)
{
#region Using ObserverPattern
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay display = new CurrentConditionsDisplay(weatherData);
weatherData.setMeasurements(80, 65, 30.4f);
weatherData.setMeasurements(82, 70, 29.2f);
weatherData.setMeasurements(78, 90, 29.2f);
#endregion
#region Using Strategy pattern
Duck duck = new Duck();
duck.setFlyBehavior(new FlyWithWings());
duck.setQuackBehavior(new Quack());
duck.performFly();
duck.performQuack();
Duck duck2 = new Duck();
duck2.setFlyBehavior(new FlyWithWings());
duck2.setQuackBehavior(new Squeakcs());
duck2.performQuack();
duck2.performFly();
#endregion
#region Using Decorator pattern
Beverage beverage = new Espresso();
Console.WriteLine(beverage.GetDescription() + " $" + beverage.cost());
Beverage beverage2 = new DarkRoast();
beverage2 = new Mocha(beverage2);
beverage2 = new Mocha(beverage2);
beverage2 = new Whip(beverage2);
Console.WriteLine(beverage2.GetDescription() + " $" + beverage2.cost());
Beverage beverage3 = new HouseBlend();
beverage3 = new Soy(beverage3);
beverage3 = new Mocha(beverage3);
beverage3 = new Whip(beverage3);
Console.WriteLine(beverage3.GetDescription() + " $" + beverage3.cost());
#endregion
// Don't close console on program end
Console.ReadKey();
}
public static void UseDecoratorPattern(IView view)
{
Beverage espresso = new Espresso();
view.DisplayMessage(espresso.GetDescription() + " $" + espresso.Cost());
Beverage houseBlend = new HouseBlend();
//decorate the object
houseBlend = new Mocha(houseBlend);
houseBlend = new Whip(houseBlend);
view.DisplayMessage(houseBlend.GetDescription() + " $" + houseBlend.Cost());
Beverage newEspresso = new Espresso();
newEspresso = new Mocha(newEspresso);
newEspresso = new Soy(newEspresso);
newEspresso = new Whip(newEspresso);
view.DisplayMessage(newEspresso.GetDescription() + " $" + newEspresso.Cost());
}