date.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2012 Vincent Lachenal
 
  This file is part of ANCH Framework.
 
  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
 
  ANCH Framework is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <memory>
#include <mutex>
#include <chrono>
#include <ctime>
 
 
namespace anch::date {
 
  class DateFormatter;
  namespace formatter {
    class IDatePartFormatter;
  }

  class Date {
 
    friend class formatter::IDatePartFormatter;
    friend class DateFormatter;
 
    // Attributes +
  protected:
    static std::mutex _mutex;

    std::int64_t _timestamp;

    int32_t _years = 0;

    uint16_t _months = 0;

    uint16_t _ydays = 0;

    uint16_t _mdays = 0;

    uint16_t _wdays = 0;

    uint16_t _hours = 0;

    uint16_t _minutes = 0;

    uint16_t _seconds = 0;

    uint16_t _milliseconds = 0;

    uint16_t _microseconds = 0;

    uint16_t _nanoseconds = 0;
    // Attributes -
 
    // Constructors +
  public:
    Date(bool init = true);

    Date(const std::time_t& time);

    Date(const std::tm* const time);

    Date(const std::timespec& time);
    // Constructors -
 
    // Destructor +
  public:
    virtual ~Date();
    // Destructor -
 
    // Methods +
  private:
    template<typename R, typename P>
    void initialize(const std::chrono::duration<R,P>& duration) noexcept {
      _nanoseconds = static_cast<uint16_t>(std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 1000);
      _microseconds = static_cast<uint16_t>(std::chrono::duration_cast<std::chrono::microseconds>(duration).count() % 1000);
      _milliseconds = static_cast<uint16_t>(std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() % 1000);
    }

    void initialize(const std::tm* const time);

    void computeTimestamp();

    void computeTm(std::tm& time) const;
 
  public:
    bool after(const Date& date) const noexcept;

    bool before(const Date& date) const noexcept;

    bool equals(const Date& date) const noexcept;
    // Methods -
 
 
    // Operators +
  public:
    bool operator > (const Date& date) const noexcept;

    bool operator >= (const Date& date) const noexcept;

    bool operator < (const Date& date) const noexcept;

    bool operator <= (const Date& date) const noexcept;

    bool operator == (const Date& date) const noexcept;

    bool operator != (const Date& date) const noexcept;

    operator std::time_t() const noexcept;

    operator std::tm() const noexcept;

    operator std::timespec() const noexcept;
    // Operators -
 
  };
 
  inline void Date::computeTm(std::tm& time) const {
    time.tm_sec = _seconds;
    time.tm_min = _minutes;
    time.tm_hour = _hours;
    time.tm_mday = _mdays;
    time.tm_mon = _months;
    time.tm_year = _years - 1900;
  }
 
  inline bool Date::after(const Date& date) const noexcept {
    return _timestamp > date._timestamp;
  }
 
  inline bool Date::before(const Date& date) const noexcept {
    return _timestamp < date._timestamp;
  }
 
  inline bool Date::equals(const Date& date) const noexcept {
    return _timestamp == date._timestamp;
  }
 
  inline bool Date::operator > (const Date& date) const noexcept {
    return after(date);
  }
 
  inline bool Date::operator >= (const Date& date) const noexcept {
    return (after(date) || equals(date));
  }
 
  inline bool Date::operator < (const Date& date) const noexcept {
    return before(date);
  }
 
  inline bool Date::operator <= (const Date& date) const noexcept {
    return (before(date) || equals(date));
  }
 
  inline bool Date::operator == (const Date& date) const noexcept {
    return equals(date);
  }
 
  inline bool Date::operator != (const Date& date) const noexcept {
    return !equals(date);
  }
 
  inline Date::operator std::time_t() const noexcept {
    std::tm time;
    computeTm(time);
    return std::mktime(&time);
  }
 
  inline Date::operator std::tm() const noexcept {
    std::tm time;
    computeTm(time);
    return time;
  }
 
 
  inline Date::operator std::timespec() const noexcept {
    std::timespec time;
    std::tm cal;
    computeTm(cal);
    time.tv_sec = std::mktime(&cal);
    time.tv_nsec = _nanoseconds + 1000 * _microseconds + 1000000 * _milliseconds;
    return time;
  }
 
}