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       1                 :             : /********************************************************************\
       2                 :             :  * gnc-timezone.cpp - Retrieve timezone information from OS.        *
       3                 :             :  * Copyright 2014 John Ralls <jralls@ceridwen.us>                   *
       4                 :             :  * Based on work done with Arnel Borja for GLib's gtimezone in 2012.*
       5                 :             :  * This program is free software; you can redistribute it and/or    *
       6                 :             :  * modify it under the terms of the GNU General Public License as   *
       7                 :             :  * published by the Free Software Foundation; either version 2 of   *
       8                 :             :  * the License, or (at your option) any later version.              *
       9                 :             :  *                                                                  *
      10                 :             :  * This program is distributed in the hope that it will be useful,  *
      11                 :             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of   *
      12                 :             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
      13                 :             :  * GNU General Public License for more details.                     *
      14                 :             :  *                                                                  *
      15                 :             :  * You should have received a copy of the GNU General Public License*
      16                 :             :  * along with this program; if not, contact:                        *
      17                 :             :  *                                                                  *
      18                 :             :  * Free Software Foundation           Voice:  +1-617-542-5942       *
      19                 :             :  * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652       *
      20                 :             :  * Boston, MA  02110-1301,  USA       gnu@gnu.org                   *
      21                 :             : \********************************************************************/
      22                 :             : 
      23                 :             : #ifndef __GNC_TIMEZONE_HPP__
      24                 :             : #define __GNC_TIMEZONE_HPP__
      25                 :             : 
      26                 :             : #include <platform.h>
      27                 :             : #if PLATFORM(WINDOWS)
      28                 :             : #include <windows.h>
      29                 :             : #endif
      30                 :             : 
      31                 :             : #define BOOST_ERROR_CODE_HEADER_ONLY
      32                 :             : #include <boost/date_time/local_time/local_time.hpp>
      33                 :             : 
      34                 :             : namespace gnc
      35                 :             : {
      36                 :             :     namespace date
      37                 :             :     {}
      38                 :             : }// Move these later
      39                 :             : using TZ = boost::local_time::time_zone;
      40                 :             : using TZ_Ptr = boost::local_time::time_zone_ptr;
      41                 :             : using TZ_Entry = std::pair<int, TZ_Ptr>;
      42                 :             : using TZ_Vector = std::vector<TZ_Entry>;
      43                 :             : using time_zone_names = boost::local_time::time_zone_names;
      44                 :             : 
      45                 :             : class TimeZoneProvider
      46                 :             : {
      47                 :             : public:
      48                 :             :     // The default constructor provides the time zone for the current locale
      49                 :         342 :     TimeZoneProvider() : TimeZoneProvider (static_cast<std::string>("")) {}
      50                 :             :     TimeZoneProvider(const std::string& tzname); //create a provider for a specified TZ.
      51                 :             :     TimeZoneProvider(const TimeZoneProvider&) = delete;
      52                 :             :     TimeZoneProvider(const TimeZoneProvider&&) = delete;
      53                 :             :     TimeZoneProvider operator=(const TimeZoneProvider&) = delete;
      54                 :             :     TimeZoneProvider operator=(const TimeZoneProvider&&) = delete;
      55                 :             :     TZ_Ptr get (int year) const noexcept;
      56                 :             :     void dump() const noexcept;
      57                 :             :     static const unsigned int min_year; //1400
      58                 :             :     static const unsigned int max_year; //9999
      59                 :             : private:
      60                 :             :     void parse_file(const std::string& tzname);
      61                 :             :     bool construct(const std::string& tzname);
      62                 :             :     TZ_Vector m_zone_vector;
      63                 :             : #if PLATFORM(WINDOWS)
      64                 :             :     void load_windows_dynamic_tz(HKEY, time_zone_names);
      65                 :             :     void load_windows_classic_tz(HKEY, time_zone_names);
      66                 :             :     void load_windows_default_tz(void);
      67                 :             : #endif
      68                 :             : };
      69                 :             : 
      70                 :             : #endif //__GCN_TIMEZONE_HPP__