using System;
namespace DoFactory.GangOfFour.Facade.RealWorld
{
/// <summary>
/// MainApp startup class for Real-World
/// Facade Design Pattern.
/// </summary>
class MainApp
{
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
// Facade
Mortgage mortgage = new Mortgage();
// Evaluate mortgage eligibility for customer
Customer customer = new Customer("Ann McKinsey");
bool eligible = mortgage.IsEligible(customer, 125000);
Console.WriteLine("\n" + customer.Name +
" has been " + (eligible ? "Approved" : "Rejected"));
// Wait for user
Console.ReadKey();
}
}
/// <summary>
/// The 'Subsystem ClassA' class
/// </summary>
class Bank
{
public bool HasSufficientSavings(Customer c, int amount)
{
Console.WriteLine("Check bank for " + c.Name);
return true;
}
}
/// <summary>
/// The 'Subsystem ClassB' class
/// </summary>
class Credit
{
public bool HasGoodCredit(Customer c)
{
Console.WriteLine("Check credit for " + c.Name);
return true;
}
}
/// <summary>
/// The 'Subsystem ClassC' class
/// </summary>
class Loan
{
public bool HasNoBadLoans(Customer c)
{
Console.WriteLine("Check loans for " + c.Name);
return true;
}
}
/// <summary>
/// Customer class
/// </summary>
class Customer
{
private string _name;
// Constructor
public Customer(string name)
{
this._name = name;
}
// Gets the name
public string Name
{
get { return _name; }
}
}
/// <summary>
/// The 'Facade' class
/// </summary>
class Mortgage
{
private Bank _bank = new Bank();
private Loan _loan = new Loan();
private Credit _credit = new Credit();
public bool IsEligible(Customer cust, int amount)
{
Console.WriteLine("{0} applies for {1:C} loan\n",
cust.Name, amount);
bool eligible = true;
// Check creditworthyness of applicant
if (!_bank.HasSufficientSavings(cust, amount))
{
eligible = false;
}
else if (!_loan.HasNoBadLoans(cust))
{
eligible = false;
}
else if (!_credit.HasGoodCredit(cust))
{
eligible = false;
}
return eligible;
}
}
}