public void Operation(FlyweightCar uniqueState)
{
string s = JsonConvert.SerializeObject(this._sharedState);
string u = JsonConvert.SerializeObject(uniqueState);
System.Console.WriteLine($"Flyweight: Displaying shared {s} and unique {u} state.");
}
public static void addCarToPoliceDatabase(FlyweightFactory factory, FlyweightCar car)
{
Console.WriteLine("\nClient: Adding a car to database.");
var flyweight = factory.GetFlyweight(new FlyweightCar {
Color = car.Color,
Model = car.Model,
Company = car.Company
});
// The client code either stores or calculates extrinsic state and
// passes it to the flyweight's methods.
flyweight.Operation(car);
}
// Returns an existing Flyweight with a given state or creates a new
// one.
public Flyweight GetFlyweight(FlyweightCar sharedState)
{
string key = this.getKey(sharedState);
if (flyweights.Where(t => t.Item2 == key).Count() == 0)
{
System.Console.WriteLine("FlyweightFactory: Can't find a flyweight, creating new one.");
flyweights.Add(new Tuple <Flyweight, string>(new Flyweight(sharedState), key));
}
else
{
Console.WriteLine("FlyweightFactory: Reusing existing flyweight.");
}
return(flyweights.Where(t => t.Item2 == key).FirstOrDefault().Item1);
}
private string getKey(FlyweightCar key)
{
List <string> elements = new List <string>();
elements.Add(key.Model);
elements.Add(key.Color);
elements.Add(key.Company);
if (key.Owner != null && key.Number != null)
{
elements.Add(key.Number);
elements.Add(key.Owner);
}
elements.Sort();
return(string.Join("_", elements));
}
public Flyweight(FlyweightCar car)
{
this._sharedState = car;
}