using System;
namespace DoFactory.GangOfFour.Proxy.RealWorld
{
/// <summary>
/// MainApp startup class for Real-World
/// Proxy Design Pattern.
/// </summary>
class MainApp
{
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
// Create math proxy
MathProxy proxy = new MathProxy();
// Do the math
Console.WriteLine("4 + 2 = " + proxy.Add(4, 2));
Console.WriteLine("4 - 2 = " + proxy.Sub(4, 2));
Console.WriteLine("4 * 2 = " + proxy.Mul(4, 2));
Console.WriteLine("4 / 2 = " + proxy.Div(4, 2));
// Wait for user
Console.ReadKey();
}
}
/// <summary>
/// The 'Subject interface
/// </summary>
public interface IMath
{
double Add(double x, double y);
double Sub(double x, double y);
double Mul(double x, double y);
double Div(double x, double y);
}
/// <summary>
/// The 'RealSubject' class
/// </summary>
class Math : IMath
{
public double Add(double x, double y) { return x + y; }
public double Sub(double x, double y) { return x - y; }
public double Mul(double x, double y) { return x * y; }
public double Div(double x, double y) { return x / y; }
}
/// <summary>
/// The 'Proxy Object' class
/// </summary>
class MathProxy : IMath
{
private Math _math = new Math();
public double Add(double x, double y)
{
return _math.Add(x, y);
}
public double Sub(double x, double y)
{
return _math.Sub(x, y);
}
public double Mul(double x, double y)
{
return _math.Mul(x, y);
}
public double Div(double x, double y)
{
return _math.Div(x, y);
}
}
}