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unit Pattern;

interface

uses SysUtils;

type

  TPurchase = class
  public
    Number: integer;
    Amount: Double;
    Purpose: string;
    constructor Create(num: integer; am: Double; pur: string);
  end;

  IApprover = interface
  ['{3ACA3967-FFCF-48A1-AC45-9A9B98A8DD96}']
    procedure SetSuccessor(successor: IApprover);
    procedure ProcessRequest(purchase: TPurchase);
  end;

  TApprover = class(TInterfacedObject, IApprover)
  protected
    FSuccessor: IApprover;
  public
    procedure SetSuccessor(successor: IApprover);
    procedure ProcessRequest(purchase: TPurchase); virtual; abstract;
  end;

  TDirector = class(TApprover)
    procedure ProcessRequest(purchase: TPurchase); override;
  end;

  TVicePresident = class(TApprover)
    procedure ProcessRequest(purchase: TPurchase); override;
  end;

  TPresident = class(TApprover)
    procedure ProcessRequest(purchase: TPurchase); override;
  end;

implementation

{ TApprover }

procedure TApprover.SetSuccessor(successor: IApprover);
begin
  FSuccessor := successor;
end;

{ TDirector }

procedure TDirector.ProcessRequest(purchase: TPurchase);
begin
  if purchase.Amount < 10000.0 then
    WriteLn(Format('Director approved request # %d', [purchase.Number]))
  else if FSuccessor <> nil then
    FSuccessor.ProcessRequest(purchase);
end;

{ TVicePresident }

procedure TVicePresident.ProcessRequest(purchase: TPurchase);
begin
  if purchase.Amount < 25000.0 then
    WriteLn(Format('VicePresident approved request # %d', [purchase.Number]))
  else if FSuccessor <> nil then
    FSuccessor.ProcessRequest(purchase);
end;

{ TPresident }

procedure TPresident.ProcessRequest(purchase: TPurchase);
begin
  if purchase.Amount < 100000.0 then
    WriteLn(Format('President approved request # %d', [purchase.Number]))
  else
    WriteLn(Format('Request# %d requires an executive meeting!', [purchase.Number]))
end;

{ TPurchase }

constructor TPurchase.Create(num: integer; am: Double; pur: string);
begin
  Number := num;
  Amount := am;
  Purpose := pur;
end;

end.

//______________________________________________________________________

program Behavioral.ChainOfResponsibility.Pattern;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  Pattern in 'Pattern.pas';

var
  Director: IApprover;
  VicePresident: IApprover;
  President: IApprover;
  Purchase: TPurchase;

begin
  ReportMemoryLeaksOnShutDown := DebugHook <> 0;
  try
    Director := TDirector.Create;
    VicePresident := TVicePresident.Create;
    President := TPresident.Create;

    try
      Director.SetSuccessor(VicePresident);
      VicePresident.SetSuccessor(President);

      Purchase := TPurchase.Create(2034, 350.00, 'Supplies');
      Director.ProcessRequest(Purchase);

      Purchase.Free;
      Purchase := TPurchase.Create(2035, 32590.10, 'Project X');
      Director.ProcessRequest(Purchase);

      Purchase.Free;
      Purchase := TPurchase.Create(2036, 122100.00, 'Project Y');
      Director.ProcessRequest(Purchase);

      ReadLn;
    finally
      Purchase.Free;
    end;
  except
    on E:Exception do
      Writeln(E.Classname, ': ', E.Message);
  end;
end.

namespace ChainOfResponsibility {

    abstract class Logger {

        const ERR = 3;
        const NOTICE = 5;
        const DEBUG = 7;

        protected $mask;
        // Следующий элемент в цепочке обязанностей
        protected $next;

        public function __construct($mask) {
            $this->mask = $mask;
        }

        public function setNext(Logger $log) {
            $this->next = $log;
            return $log;
        }

        public function message($msg, $priority) {
            if ($priority <= $this->mask) {
                $this->writeMessage($msg);
            }

            if ($this->next != null) {
                $this->next->message($msg, $priority);
            }
        }

        protected abstract function writeMessage($msg);
    }

    class StdoutLogger extends Logger {

        protected function writeMessage($msg) {
            echo sprintf("Writing to stdout:%s\n", $msg);
        }

    }

    class EmailLogger extends Logger {

        protected function writeMessage($msg) {
            echo sprintf("Sending via email:%s\n", $msg);
        }

    }

    class StderrLogger extends Logger {

        protected function writeMessage($msg) {
            echo sprintf("Sending to stderr:%s\n", $msg);
        }

    }

    //цепочка обязанностей
    class ChainOfResponsibilityExample {
        public function run() {

            // строим цепочку обязанностей
            $logger = new StdoutLogger(Logger::DEBUG);
            $logger1 = $logger->setNext(new EmailLogger(Logger::NOTICE));
            $logger2 = $logger1->setNext(new StderrLogger(Logger::ERR));

            // Handled by StdoutLogger
            $logger->message("Entering function y.", Logger::DEBUG);

            // Handled by StdoutLogger and EmailLogger
            $logger->message("Step1 completed.", Logger::NOTICE);

            // Handled by all three loggers
            $logger->message("An error has occurred.", Logger::ERR);
        }
    }

    $chain = new ChainOfResponsibilityExample();
    $chain->run();

}

package chainofresp;

abstract class Logger {
    public static int ERR = 3;
    public static int NOTICE = 5;
    public static int DEBUG = 7;
    protected int mask;

    // The next element in the chain of responsibility
    protected Logger next;

    public Logger setNext(Logger log) {
        next = log;
        return log;
    }

    public void message(String msg, int priority) {
        if (priority <= mask) {
            writeMessage(msg);
        }
        if (next != null) {
            next.message(msg, priority);
        }
    }

    abstract protected void writeMessage(String msg);
}

class StdoutLogger extends Logger {
    public StdoutLogger(int mask) { 
        this.mask = mask;
    }

    protected void writeMessage(String msg) {
        System.out.println("Writing to stdout: " + msg);
    }
}

class EmailLogger extends Logger {
    public EmailLogger(int mask) {
        this.mask = mask;
    }

    protected void writeMessage(String msg) {
        System.out.println("Sending via email: " + msg);
    }
}

class StderrLogger extends Logger {
    public StderrLogger(int mask) {
        this.mask = mask;
    }

    protected void writeMessage(String msg) {
        System.out.println("Sending to stderr: " + msg);
    }
}

public class ChainOfResponsibilityExample {
    public static void main(String[] args) {
        // Build the chain of responsibility
        Logger logger, logger1,logger2;
        logger = new StdoutLogger(Logger.DEBUG);
        logger1 = logger.setNext(new EmailLogger(Logger.NOTICE));
        logger2 = logger1.setNext(new StderrLogger(Logger.ERR));

        // Handled by StdoutLogger
        logger.message("Entering function y.", Logger.DEBUG);

        // Handled by StdoutLogger and EmailLogger
        logger.message("Step1 completed.", Logger.NOTICE);

        // Handled by all three loggers
        logger.message("An error has occurred.", Logger.ERR);
    }
}
/*
The output is:
   Writing to stdout:   Entering function y.
   Writing to stdout:   Step1 completed.
   Sending via e-mail:  Step1 completed.
   Writing to stdout:   An error has occurred.
   Sending via e-mail:  An error has occurred.
   Writing to stderr:   An error has occurred.
*/

// Chain of Responsibility pattern -- Structural example

using System;

namespace DoFactory.GangOfFour.Chain.Structural
{
  /// <summary>
  /// MainApp startup class for Structural
  /// Chain of Responsibility Design Pattern.
  /// </summary>
  class MainApp
  {
    /// <summary>
    /// Entry point into console application.
    /// </summary>
    static void Main()
    {
      // Setup Chain of Responsibility
      Handler h1 = new ConcreteHandler1();
      Handler h2 = new ConcreteHandler2();
      Handler h3 = new ConcreteHandler3();
      h1.SetSuccessor(h2);
      h2.SetSuccessor(h3);

      // Generate and process request
      int[] requests = { 2, 5, 14, 22, 18, 3, 27, 20 };

      foreach (int request in requests)
      {
        h1.HandleRequest(request);
      }

      // Wait for user
      Console.ReadKey();
    }
  }

  /// <summary>
  /// The 'Handler' abstract class
  /// </summary>
  abstract class Handler
  {
    protected Handler successor;

    public void SetSuccessor(Handler successor)
    {
      this.successor = successor;
    }

    public abstract void HandleRequest(int request);
  }

  /// <summary>
  /// The 'ConcreteHandler1' class
  /// </summary>
  class ConcreteHandler1 : Handler
  {
    public override void HandleRequest(int request)
    {
      if (request >= 0 && request < 10)
      {
        Console.WriteLine("{0} handled request {1}",
          this.GetType().Name, request);
      }
      else if (successor != null)
      {
        successor.HandleRequest(request);
      }
    }
  }

  /// <summary>
  /// The 'ConcreteHandler2' class
  /// </summary>
  class ConcreteHandler2 : Handler
  {
    public override void HandleRequest(int request)
    {
      if (request >= 10 && request < 20)
      {
        Console.WriteLine("{0} handled request {1}",
          this.GetType().Name, request);
      }
      else if (successor != null)
      {
        successor.HandleRequest(request);
      }
    }
  }

  /// <summary>
  /// The 'ConcreteHandler3' class
  /// </summary>
  class ConcreteHandler3 : Handler
  {
    public override void HandleRequest(int request)
    {
      if (request >= 20 && request < 30)
      {
        Console.WriteLine("{0} handled request {1}",
          this.GetType().Name, request);
      }
      else if (successor != null)
      {
        successor.HandleRequest(request);
      }
    }
  }
}

Output
ConcreteHandler1 handled request 2
ConcreteHandler1 handled request 5
ConcreteHandler2 handled request 14
ConcreteHandler3 handled request 22
ConcreteHandler2 handled request 18
ConcreteHandler1 handled request 3
ConcreteHandler3 handled request 27
ConcreteHandler3 handled request 20

#include <iostream>

/**
 * Вспомогательный класс, описывающий некоторое преступление
 */
class CriminalAction {

    friend class Policeman;     // Полицейские имеют доступ к материалам следствия

    int complexity;             // Сложность дела

    const char* description;    // Краткое описание преступления

public:
    CriminalAction(int complexity, const char* description): complexity(complexity), description(description) {}

};

/**
 * Абстрактный полицейский, который может заниматься расследованием преступлений
 */
class Policeman {

protected:

    int deduction;      // дедукция (умение распутывать сложные дела) у данного полицейского

    Policeman* next;    // более умелый полицейский, который получит дело, если для текущего оно слишком сложное

    virtual void investigateConcrete(const char* description) {}    // собственно расследование

public:

    Policeman(int deduction): deduction(deduction) {}

    virtual ~Policeman() {
        if (next) {
            delete next;
        }
    }

    /**
     * Добавляет в цепочку ответственности более опытного полицейского, который сможет принять на себя
     * расследование, если текущий не справится
     */
    Policeman* setNext(Policeman* policeman) {
        next = policeman;
        return next;
    }

    /**
     * Полицейский начинает расследование или, если дело слишком сложное, передает ее более опытному коллеге
     */
    void investigate(CriminalAction* criminalAction) {
        if (deduction < criminalAction->complexity) {
            if (next) {
                next->investigate(criminalAction);
            } else {
                std::cout << "Это дело не раскрыть никому." << std::endl;
            }
        } else {
            investigateConcrete(criminalAction->description);
        }
    }
};

class MartinRiggs: public Policeman {

protected:

    void investigateConcrete(const char* description) {
        std::cout << "Расследование по делу \"" << description << "\" ведет сержант Мартин Риггс" << std::endl;
    }

public:

    MartinRiggs(int deduction): Policeman(deduction) {}
};

class JohnMcClane: public Policeman {

protected:

    void investigateConcrete(const char* description) {
        std::cout << "Расследование по делу \"" << description << "\" ведет детектив Джон Макклейн" << std::endl;
    }

public:
    JohnMcClane(int deduction): Policeman(deduction) {}
};

class VincentHanna: public Policeman {

protected:

    void investigateConcrete(const char* description) {
        std::cout << "Расследование по делу \"" << description << "\" ведет лейтенант Винсент Ханна" << std::endl;
    }

public:
    VincentHanna(int deduction): Policeman(deduction) {}
};

int main() {
    std::cout << "OUTPUT:" << std::endl;
    Policeman* policeman = new MartinRiggs(3);  // полицейский с наименьшим навыком ведения расследований
    policeman
            ->setNext(new JohnMcClane(5))
            ->setNext(new VincentHanna(8));     // добавляем ему двух опытных коллег
    policeman->investigate(new CriminalAction(2, "Торговля наркотиками из Вьетнама"));
    policeman->investigate(new CriminalAction(7, "Дерзкое ограбление банка в центре Лос-Анджелеса"));
    policeman->investigate(new CriminalAction(5, "Серия взрывов в центре Нью-Йорка"));
    return 0;
}

/**
 * OUTPUT:
 * Расследование по делу "Торговля наркотиками из Вьетнама" ведет сержант Мартин Риггс
 * Расследование по делу "Дерзкое ограбление банка в центре Лос-Анджелеса" ведет лейтенант Винсент Ханна
 * Расследование по делу "Серия взрывов в центре Нью-Йорка" ведет детектив Джон Макклейн
 */

class Car:
    def __init__(self):
        self.name = None
        self.km = 11100
        self.fuel = 5
        self.oil = 5

def handle_fuel(car):
    if car.fuel < 10:
        print "added fuel"
        car.fuel = 100

def handle_km(car):
    if car.km > 10000:
        print "made a car test."
        car.km = 0

def handle_oil(car):
    if car.oil < 10:
        print "Added oil"
        car.oil = 100

class Garage:
    def __init__(self):
        self.handlers = []

    def add_handler(self, handler):
        self.handlers.append(handler)

    def handle_car(self, car):
        for handler in self.handlers:
            handler(car)

if __name__ == '__main__':
    handlers = [handle_fuel, handle_km, handle_oil]
    garage = Garage()

    for handle in handlers:
        garage.add_handler(handle)
    garage.handle_car(Car())