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 extern "C"
26 {
27 #include <platform.h>
28 #if PLATFORM(WINDOWS)
29 #include <windows.h>
30 #endif
31 }
32 
33 #define BOOST_ERROR_CODE_HEADER_ONLY
34 #include <boost/date_time/local_time/local_time.hpp>
35 
36 namespace gnc
37 {
38     namespace date
39     {}
40 }// Move these later
41 using TZ = boost::local_time::time_zone;
42 using TZ_Ptr = boost::local_time::time_zone_ptr;
43 using TZ_Entry = std::pair<int, TZ_Ptr>;
44 using TZ_Vector = std::vector<TZ_Entry>;
45 using time_zone_names = boost::local_time::time_zone_names;
46 
47 class TimeZoneProvider
48 {
49 public:
50     // The default constructor provides the time zone for the current locale
TimeZoneProvider()51     TimeZoneProvider() : TimeZoneProvider (static_cast<std::string>("")) {}
52     TimeZoneProvider(const std::string& tzname); //create a provider for a specified TZ.
53     TimeZoneProvider(const TimeZoneProvider&) = delete;
54     TimeZoneProvider(const TimeZoneProvider&&) = delete;
55     TimeZoneProvider operator=(const TimeZoneProvider&) = delete;
56     TimeZoneProvider operator=(const TimeZoneProvider&&) = delete;
57     TZ_Ptr get (int year) const noexcept;
58     void dump() const noexcept;
59     static const unsigned int min_year; //1400
60     static const unsigned int max_year; //9999
61 private:
62     void parse_file(const std::string& tzname);
63     bool construct(const std::string& tzname);
64     TZ_Vector m_zone_vector;
65 #if PLATFORM(WINDOWS)
66     void load_windows_dynamic_tz(HKEY, time_zone_names);
67     void load_windows_classic_tz(HKEY, time_zone_names);
68     void load_windows_default_tz(void);
69 #endif
70 };
71 
72 #endif //__GCN_TIMEZONE_HPP__
73