public ShelteredAnimal DequeueCat()
{
ShelteredAnimal animal = DequeueAnimal(_cats);
_animals.Remove(animal);
return(animal);
}
public ShelteredAnimal DequeueDog()
{
ShelteredAnimal animal = DequeueAnimal(_dogs);
_animals.Remove(animal);
return(animal);
}
private ShelteredAnimal DequeueAnimal(LinkedList <ShelteredAnimal> animals)
{
ValidateList <ShelteredAnimal>(animals);
ShelteredAnimal animal = animals.Last.Value;
animals.RemoveLast();
return(animal);
}
public ShelteredAnimal DequeueAny()
{
ShelteredAnimal animal = DequeueAnimal(_animals);
_dogs.Remove(animal);
_cats.Remove(animal);
return(animal);
}
public void Enqueue(ShelteredAnimal animal)
{
animal.Added = DateTime.Now;
Type type = animal.GetType();
if (type == typeof(Dog))
{
_dogs.AddLast((Dog)animal);
}
if (type == typeof(Cat))
{
_cats.AddLast((Cat)animal);
}
}
public ShelteredAnimal DequeueAny()
{
if (_dogs.Count == 0)
{
return(DequeueCat());
}
if (_cats.Count == 0)
{
return(DequeueDog());
}
ShelteredAnimal dog = _dogs.First.Value;
ShelteredAnimal cat = _cats.First.Value;
if (dog.IsOlderThan(cat))
{
return(DequeueDog());
}
return(DequeueCat());
}
public bool IsOlderThan(ShelteredAnimal animal)
{
return(Added < animal.Added);
}