Observer_Class.h

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#pragma once
#ifndef __OBSERVER_CLASS_H__
#define __OBSERVER_CLASS_H__
 
#include <iostream>
#include <string>
 
#include "helpers/argumentnull_error.h"
#include "helpers/formatstring.h"
#include "helpers/uint32_to_binary.h"
 
#include "ObserverSubject_NumberProducer.h"
 
namespace DesignPatternExamples_cpp
{
 
    class ObserverForDecimal : public IObserverNumberChanged
    {
    private:
        INumberProducer::shared_ptr_t _numberProducer;
 
    public:
        ObserverForDecimal(INumberProducer::shared_ptr_t numberProducer)
            : _numberProducer(numberProducer)
        {
            if (!numberProducer)
            {
                throw Helpers::argumentnull_error("numberProducer",
                    "The ObserverForDecimal constructor requires a valid INumberProducer object.");
            }
        }
 
        void NumberChanged()
        {
            uint32_t number = _numberProducer->FetchNumber();
            std::cout << Helpers::formatstring("    Decimal    : %u", number) << std::endl;
        }
    };
 
 
    //########################################################################
    //########################################################################
 
 
    class ObserverForHexaDecimal : public IObserverNumberChanged
    {
    private:
        INumberProducer::shared_ptr_t _numberProducer;
 
    public:
        ObserverForHexaDecimal(INumberProducer::shared_ptr_t numberProducer)
            : _numberProducer(numberProducer)
        {
            if (!numberProducer)
            {
                throw Helpers::argumentnull_error("numberProducer", "The ObserverForHexaDecimal constructor requires a valid INumberProducer object.");
            }
        }
 
 
        void NumberChanged()
        {
            uint32_t number = _numberProducer->FetchNumber();
            std::cout << Helpers::formatstring("    Hexadecimal: %#08X", number) << std::endl;
        }
    };
 
 
    //########################################################################
    //########################################################################
 
 
    class ObserverForBinary : public IObserverNumberChanged
    {
    private:
        INumberProducer::shared_ptr_t _numberProducer;
 
    public:
        ObserverForBinary(INumberProducer::shared_ptr_t numberProducer)
            : _numberProducer(numberProducer)
        {
            if (!numberProducer)
            {
                throw Helpers::argumentnull_error("numberProducer", "The ObserverForBinary constructor requires a valid INumberProducer object.");
            }
        }
 
 
        void NumberChanged()
        {
            uint32_t number = _numberProducer->FetchNumber();
            std::string binary = Helpers::uint32_to_binary(number);
            std::cout << Helpers::formatstring("    Binary     : %s", binary.c_str())
                      << std::endl;
        }
    };
 
} // end namespace
 
#endif // __OBSERVER_CLASS_H__