// Optional parameter usage
public Duck(IQuackStrategy quackStrategy = null)
{
// Duck depends on IQuackSelecctor which is a factory
// Determines which (Strategy) animal to inject
// Note how quack selection decoupled from Duck class
// Change quackStrategy types without modifying Duck.
IQuackSelector quackSelector = new QuackSelector();
// If parameter not passed, set default quackStrategy to Duck
// Note usage of null-coalescing operator
QuackSound = quackStrategy ?? quackSelector.SetAnimal(QuackBehaviorEnum.Duck);
}
public IQuackStrategy SetAnimal(QuackBehaviorEnum quackBehaviorEnum)
{
switch (quackBehaviorEnum)
{
case QuackBehaviorEnum.Bird:
QuackStrategySound = new BirdQuackStrategy();
break;
case QuackBehaviorEnum.Duck:
QuackStrategySound = new DuckQuackStrategy();
break;
case QuackBehaviorEnum.Cat:
QuackStrategySound = new CatQuackStrategy();
break;
case QuackBehaviorEnum.Dog:
QuackStrategySound = new DogQuackStrategy();
break;
case QuackBehaviorEnum.Lion:
QuackStrategySound = new LionQuackStrategy();
break;
case QuackBehaviorEnum.Mouse:
QuackStrategySound = new MouseQuackStrategy();
break;
// Add new quackStrategy
//case QuackBehaviorEnum.Sheep:
// QuackStrategySound = new SheepQuackStrategy();
// break;
default:
QuackStrategySound = new DuckQuackStrategy();
break;
}
return(QuackStrategySound);
}
public SmallDuck(IFlyStrategy flyStrategy, IQuackStrategy quackStrategy) : base(flyStrategy, quackStrategy)
{
}
public void ChangeQuackStrategy(IQuackStrategy quackStrategy)
{
_quackStrategy = quackStrategy;
}
protected Duck(IQuackStrategy quackStrategy, IEatStrategy eatStrategy)
{
_quackStrategy = quackStrategy;
_eatStrategy = eatStrategy;
}
public void SetQuackStrategy(IQuackStrategy quackStrategy)
{
_quackStrategy = quackStrategy;
}
public Duck(IFlyStrategy flyStrategy, IQuackStrategy quackStrategy)
{
_flyStrategy = flyStrategy;
_quackStrategy = quackStrategy;
}
public ModelDuck(IFlyStrategy flyStrategy, IQuackStrategy quackStrategy)
{
this.flyStrategy = flyStrategy;
this.quackStrategy = quackStrategy;
}
public WildDuck(IFlyStrategy flyStrategy, IQuackStrategy quackStrategy) : base(flyStrategy, quackStrategy)
{
}
public Duck()
{
this.flyStrategy = new WingFlyStrategy();
this.quackStrategy = new NormalQuackStrategy();
}
public Duck(IFlyStrategy flyStrategy, IQuackStrategy quackStrategy)
{
this._flyStrategy = flyStrategy;
this._quackStrategy = quackStrategy;
}
