public static void Start()
{
Console.WriteLine("\nMultipleDispatchWithDoubleDispatch\n");
SpaceShip ship = new SpaceShip()
{
Name = "enterprise"
};
IObjectInSpace a = new Planet()
{
Gravity = 1
};
IObjectInSpace b = new Planet()
{
Gravity = 5
};
IObjectInSpace c = new Asteroid()
{
Metal = 3
};
IObjectInSpace d = new Asteroid()
{
Metal = 2
};
Console.WriteLine(ship.DescribeInteraction(a));
Console.WriteLine(ship.DescribeInteraction(b));
Console.WriteLine(ship.DescribeInteraction(c));
Console.WriteLine(ship.DescribeInteraction(d));
// Downside: IObjectInSpace and the SpaceShip are tightly coupled. Both need to know about each other.
// If we want to introduce a different SpaceShip (e.g. a bigger one that can handle high gravity
// better, we would need to add methods to all IObjectInSpace classes. This violates the open/close
// principle and it gets worse the more IObjectInSpace we have.
}
public string DescribeInteractionWithSpaceShip(SpaceShip ship)
{
// We know we have a SpaceShip and we know this is a Planet
if (Gravity > 3)
{
return("due to high gravity, the " + ship.Name + " crashes into a planet");
}
else
{
return("the " + ship.Name + " lands safely on this wonderful planet");
}
}
public string DescribeInteractionWithSpaceShip(SpaceShip ship)
{
// We know we have a SpaceShip and we know this is a Planet
if (Gravity > 3)
{
return "due to high gravity, the " + ship.Name + " crashes into a planet";
}
else
{
return "the " + ship.Name + " lands safely on this wonderful planet";
}
}
public string DescribeInteractionWithSpaceShip(SpaceShip ship)
{
// We know we have a SpaceShip and we know this is an Asteroid
return("the " + ship.Name + " mines " + Metal + " tons of metal from an asteroid");
}
public static void Start()
{
Console.WriteLine("\nMultipleDispatchWithDoubleDispatch\n");
SpaceShip ship = new SpaceShip() { Name = "enterprise" };
IObjectInSpace a = new Planet() { Gravity = 1 };
IObjectInSpace b = new Planet() { Gravity = 5 };
IObjectInSpace c = new Asteroid() { Metal = 3 };
IObjectInSpace d = new Asteroid() { Metal = 2 };
Console.WriteLine(ship.DescribeInteraction(a));
Console.WriteLine(ship.DescribeInteraction(b));
Console.WriteLine(ship.DescribeInteraction(c));
Console.WriteLine(ship.DescribeInteraction(d));
// Downside: IObjectInSpace and the SpaceShip are tightly coupled. Both need to know about each other.
// If we want to introduce a different SpaceShip (e.g. a bigger one that can handle high gravity
// better, we would need to add methods to all IObjectInSpace classes. This violates the open/close
// principle and it gets worse the more IObjectInSpace we have.
}
public string DescribeInteractionWithSpaceShip(SpaceShip ship)
{
// We know we have a SpaceShip and we know this is an Asteroid
return "the " + ship.Name + " mines " + Metal + " tons of metal from an asteroid";
}