using System;
namespace DoFactory.GangOfFour.Memento.RealWorld
{
/// <summary>
/// MainApp startup class for Real-World
/// Memento Design Pattern.
/// </summary>
class MainApp
{
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
SalesProspect s = new SalesProspect();
s.Name = "Noel van Halen";
s.Phone = "(412) 256-0990";
s.Budget = 25000.0;
// Store internal state
ProspectMemory m = new ProspectMemory();
m.Memento = s.SaveMemento();
// Continue changing originator
s.Name = "Leo Welch";
s.Phone = "(310) 209-7111";
s.Budget = 1000000.0;
// Restore saved state
s.RestoreMemento(m.Memento);
// Wait for user
Console.ReadKey();
}
}
/// <summary>
/// The 'Originator' class
/// </summary>
class SalesProspect
{
private string _name;
private string _phone;
private double _budget;
// Gets or sets name
public string Name
{
get { return _name; }
set
{
_name = value;
Console.WriteLine("Name: " + _name);
}
}
// Gets or sets phone
public string Phone
{
get { return _phone; }
set
{
_phone = value;
Console.WriteLine("Phone: " + _phone);
}
}
// Gets or sets budget
public double Budget
{
get { return _budget; }
set
{
_budget = value;
Console.WriteLine("Budget: " + _budget);
}
}
// Stores memento
public Memento SaveMemento()
{
Console.WriteLine("\nSaving state --\n");
return new Memento(_name, _phone, _budget);
}
// Restores memento
public void RestoreMemento(Memento memento)
{
Console.WriteLine("\nRestoring state --\n");
this.Name = memento.Name;
this.Phone = memento.Phone;
this.Budget = memento.Budget;
}
}
/// <summary>
/// The 'Memento' class
/// </summary>
class Memento
{
private string _name;
private string _phone;
private double _budget;
// Constructor
public Memento(string name, string phone, double budget)
{
this._name = name;
this._phone = phone;
this._budget = budget;
}
// Gets or sets name
public string Name
{
get { return _name; }
set { _name = value; }
}
// Gets or set phone
public string Phone
{
get { return _phone; }
set { _phone = value; }
}
// Gets or sets budget
public double Budget
{
get { return _budget; }
set { _budget = value; }
}
}
/// <summary>
/// The 'Caretaker' class
/// </summary>
class ProspectMemory
{
private Memento _memento;
// Property
public Memento Memento
{
set { _memento = value; }
get { return _memento; }
}
}
}