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using System;

namespace Bridge

{

class Program

{

static void Main(string[] args)

{

if (System.IO.File.Exists("Leiame.txt"))

{

string[] linhas = System.IO.File.ReadAllLines(@"Leiame.txt");

foreach (var linha in linhas)

{

if (linha.StartsWith("\t"))

Console.ForegroundColor = ConsoleColor.White;

else

Console.ForegroundColor = ConsoleColor.DarkGreen;

Console.WriteLine(linha);

}

Console.WriteLine(new String('=', 100));

Console.WriteLine();

Console.WriteLine();

Console.ResetColor();

}

Console.WriteLine("\n------------- Exemplo 01");

CalculadoraFramework cf = new CalculadoraFramework();

CalculadoraJohnWallis jw = new CalculadoraJohnWallis();

CalculadoraLeibniz lz = new CalculadoraLeibniz();

Console.WriteLine("constante do framework");

Console.WriteLine("\tPI: {0}\n", new Calculadora(cf).PI);

Console.WriteLine("algoritmo de John Wallis");

Console.WriteLine("\tPI: {0}\n", new Calculadora(jw).PI);

Console.WriteLine("algoritmo de Leibniz");

Console.WriteLine("\tPI: {0}\n", new Calculadora(lz).PI);

Console.ReadKey();

Console.WriteLine("\n------------- Exemplo 02");

//usando Generic

Console.WriteLine("constante do framework");

Console.WriteLine("\tPI: {0}\n", new CalculadoraGeneric<CalculadoraFramework>().PI);

Console.WriteLine("algoritmo de John Wallis");

Console.WriteLine("\tPI: {0}\n", new CalculadoraGeneric<CalculadoraJohnWallis>().PI);

Console.WriteLine("algoritmo de Leibniz");

Console.WriteLine("\tPI: {0}\n", new CalculadoraGeneric<CalculadoraLeibniz>().PI);

Console.ReadKey();

}

}

//Bridge

interface ICalculadora

{

//OperationImp

double PI { get; }

}

//ImplementationA

class CalculadoraFramework : ICalculadora

{

//retorna a constante PI da classe Math

//OperationImp

public double PI { get { return Math.PI; } }

}

//ImplementationB

class CalculadoraJohnWallis : ICalculadora

{

//OperationImp

public double PI

{

get

{

double pi = 1;

for (int i = 1; i <= 100000; i++)

{

double numero = i * 2;

pi *= numero / (numero - 1);

pi *= numero / (numero + 1);

}

return 2 * pi;

}

}

}

//ImplementationX

class CalculadoraLeibniz : ICalculadora

{

//OperationImp

public double PI

{

get

{

double pi = 0;

for (int i = 1; i <= 400000; i += 4)

{

pi = pi + 1.0 / i - 1.0 / (i + 2);

}

return 4 * pi;

}

}

}

//Abstraction

class Calculadora

{

//bridge

ICalculadora c;

public Calculadora(ICalculadora c)

{

this.c = c;

}

//Operation

public double PI

{

get

{

return c.PI;

}

}

}

//Abstraction usando Generic

class CalculadoraGeneric<T> where T : ICalculadora, new()

{

//Operation

public double PI

{

get

{

//bridge >>> new T()

return new T().PI;

}

}

}

}