internal AlcoholistMemento(
Alcoholist originator)
{
name = originator.Name;
consumption = originator.consumption;
lastmodified = originator.LastModificationDate;
this.originator = originator;
}
public static void RestoreMemento(Alcoholist originator)
{
if (!Mementos.ContainsKey(originator))
{
throw new InvalidOperationException("No memento.");
}
Mementos[originator].RestoreMemento(originator);
}
internal void RestoreMemento(Alcoholist alc)
{
if (!alc.Equals(originator))
{
throw new InvalidOperationException
("Invalid originator.");
}
alc.Name = name;
alc.consumption = consumption;
alc.LastModificationDate = lastmodified;
}
public static void SaveMemento(Alcoholist originator)
{
if (Mementos.ContainsKey(originator))
{
Mementos[originator] = Alcoholist.AlcoholistMemento.SaveMemento(originator);
}
else
{
Mementos.Add(originator,
Alcoholist.AlcoholistMemento
.SaveMemento(originator));
}
}
static void Main(string[] args)
{
Alcoholist barney = new Alcoholist("Barney");
AlcoholistMementoStore.SaveMemento(barney);
Console.WriteLine(barney);
barney.Consumption += 30;
System.Threading.Thread.Sleep(500);
Console.WriteLine(barney);
AlcoholistMementoStore.RestoreMemento(barney);
Console.WriteLine(barney);
Console.ReadLine();
}
internal static AlcoholistMemento SaveMemento(Alcoholist alc)
{
return(new AlcoholistMemento(alc));
}