Ada banyak situasi dalam aplikasi kita di mana kita ingin mengambil salinan obyek dari konteks dan kemudian dilanjutkan dengan salinan beberapa set independen operasi. Pola prototipe secara khusus berguna dalam skenario dimana kita dapat hanya menyalin objek dari konteks aplikasi saat ini dan kemudian lanjutkan ke independen dari objek asli.
sumber : CodeProject.com
Dalam diagram di atas para pemain utama yang terlibat adalah:
Prototype : Ini adalah sebuah antarmuka atau kelas abstrak yang mendefinisikan metode untuk mengkloning dirinya sendiri.
ConcretePrototype : ini adalah kelas beton yang akan mengkloning dirinya sendiri.
Client : Obyek aplikasi yang membutuhkan salinan kloning dari objek.
Mari kita mencoba untuk melihat bagaimana kita dapat menerapkan pola ini dalam C #.
class Program
{
static void Main(string[] args)
{
// The code to demonstrate the classic Prorotype Pattern
CJ player = new CJ();
player.Health = 1;
player.Felony = 10;
player.Money = 2.0;
Console.WriteLine("Original Player stats:");
Console.WriteLine("Health: {0}, Felony: {1}, Money: {2}",
player.Health.ToString(),
player.Felony.ToString(),
player.Money.ToString());
// We enter the cheat code here and we have a new
// player with his health fully restored.
CJ playerToSave = player.Clone() as CJ;
Console.WriteLine("\nCopy of player to save on disk:");
Console.WriteLine("Health: {0}, Felony: {1}, Money: {2}",
playerToSave.Health.ToString(),
playerToSave.Felony.ToString(),
playerToSave.Money.ToString());
PerformShallowCopy();
PerformDeepCopy();
ICloneableVersionCopy();
Console.ReadKey(true);
}
private static void PerformShallowCopy()
{
// The code to demonstrate the shallow copy
CJEx playerEx = new CJEx();
playerEx.Health = 1;
playerEx.Felony = 10;
playerEx.Money = 2.0;
playerEx.Details.Fitness = 5;
playerEx.Details.Charisma = 5;
// Lets clone the above object and change the
// proprties of contained object
CJEx shallowClonedPlayer = playerEx.Clone() as CJEx;
shallowClonedPlayer.Details.Charisma = 10;
shallowClonedPlayer.Details.Fitness = 10;
// Lets see what happened to the original object
Console.WriteLine("\nOriginal Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
playerEx.Details.Charisma.ToString(),
playerEx.Details.Fitness.ToString());
Console.WriteLine("\nShallow Cloned Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
shallowClonedPlayer.Details.Charisma.ToString(),
shallowClonedPlayer.Details.Fitness.ToString());
}
private static void PerformDeepCopy()
{
// Let us see how we can perform the deep copy now
CJEx playerEx2 = new CJEx();
playerEx2.Health = 1;
playerEx2.Felony = 10;
playerEx2.Money = 2.0;
playerEx2.Details.Fitness = 5;
playerEx2.Details.Charisma = 5;
// lets clone the object but this time perform a deep copy
CJEx shallowClonedPlayer2 = playerEx2.Clone() as CJEx;
shallowClonedPlayer2.Details.Charisma = 10;
shallowClonedPlayer2.Details.Fitness = 10;
// Lets see what happened to the original object
Console.WriteLine("\nOriginal Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
playerEx2.Details.Charisma.ToString(),
playerEx2.Details.Fitness.ToString());
Console.WriteLine("\nDeep Cloned Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
shallowClonedPlayer2.Details.Charisma.ToString(),
shallowClonedPlayer2.Details.Fitness.ToString());
}
private static void ICloneableVersionCopy()
{
// Let us see how we can perform the deep copy now
CJFinal player = new CJFinal();
player.Health = 1;
player.Felony = 10;
player.Money = 2.0;
player.Details.Fitness = 5;
player.Details.Charisma = 5;
// lets clone the object but this time perform a deep copy
CJFinal clonedPlayer = player.Clone() as CJFinal;
clonedPlayer.Details.Charisma = 10;
clonedPlayer.Details.Fitness = 10;
// Lets see what happened to the original object
Console.WriteLine("\nOriginal Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
player.Details.Charisma.ToString(),
player.Details.Fitness.ToString());
Console.WriteLine("\nICloneable Deep Cloned Object:");
Console.WriteLine("Charisma: {0}, Fitness: {1}",
clonedPlayer.Details.Charisma.ToString(),
clonedPlayer.Details.Fitness.ToString());
}
}
}
sumber : CodeProject.com
