2009-05-28 18:19:51 +00:00
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#include <Yandex/DateLUT.h>
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2014-07-08 23:52:53 +00:00
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#include <Poco/Exception.h>
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2015-06-26 17:57:49 +00:00
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2015-06-26 15:11:31 +00:00
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#include <unicode/timezone.h>
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#include <unicode/unistr.h>
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2015-06-26 17:57:49 +00:00
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#include <memory>
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2009-05-28 18:19:51 +00:00
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2015-06-26 15:11:31 +00:00
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std::string DateLUT::default_time_zone;
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2009-05-28 18:19:51 +00:00
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2013-08-11 03:40:14 +00:00
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DateLUT::DateLUT()
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2009-05-28 18:19:51 +00:00
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{
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2015-06-26 15:11:31 +00:00
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using namespace icu;
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2014-11-06 02:39:48 +00:00
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2015-06-26 15:11:31 +00:00
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std::unique_ptr<TimeZone> tz(TimeZone::createDefault());
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if (tz == nullptr)
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throw Poco::Exception("Failed to query the host time zone.");
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2014-11-06 02:39:48 +00:00
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2015-06-26 15:11:31 +00:00
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UnicodeString u_out;
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tz->getID(u_out);
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u_out.toUTF8String(default_time_zone);
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2014-11-06 02:39:48 +00:00
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2015-06-26 15:11:31 +00:00
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std::unique_ptr<StringEnumeration> time_zone_ids(TimeZone::createEnumeration());
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if (time_zone_ids == nullptr)
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throw Poco::Exception("Failed to query the list of time zones.");
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2013-08-11 03:40:14 +00:00
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2015-06-26 15:11:31 +00:00
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UErrorCode status = U_ZERO_ERROR;
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const UnicodeString * zone_id = time_zone_ids->snext(status);
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if (zone_id == nullptr)
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throw Poco::Exception("No time zone available.");
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2013-08-11 03:40:14 +00:00
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2015-06-26 17:57:49 +00:00
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std::vector<UnicodeString> time_zones;
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while ((zone_id != nullptr) && (status == U_ZERO_ERROR))
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{
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2015-06-26 17:57:49 +00:00
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time_zones.push_back(*zone_id);
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2015-06-26 15:11:31 +00:00
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zone_id = time_zone_ids->snext(status);
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}
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2015-06-26 17:57:49 +00:00
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for (const auto & time_zone : time_zones)
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{
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auto count = TimeZone::countEquivalentIDs(time_zone);
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const UnicodeString & u_group_id = TimeZone::getEquivalentID(time_zone, 0);
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std::string group_id;
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u_group_id.toUTF8String(group_id);
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auto it = time_zone_to_group.find(group_id);
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if (it == time_zone_to_group.end())
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{
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for (auto i = 1; i < count; ++i)
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{
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const UnicodeString & u_equivalent_id = TimeZone::getEquivalentID(time_zone, i);
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std::string equivalent_id;
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u_equivalent_id.toUTF8String(equivalent_id);
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time_zone_to_group.insert(std::make_pair(equivalent_id, group_id));
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}
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}
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date_lut_impl_list.emplace(std::piecewise_construct, std::forward_as_tuple(group_id), std::forward_as_tuple(nullptr));
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}
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2015-06-26 15:11:31 +00:00
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}
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2013-08-11 03:40:14 +00:00
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2015-06-26 15:11:31 +00:00
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DateLUTImpl & DateLUT::instance(const std::string & time_zone)
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{
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auto & date_lut = Singleton<DateLUT>::instance();
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return date_lut.get(time_zone);
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}
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2013-08-11 03:40:14 +00:00
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2015-06-26 15:11:31 +00:00
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DateLUTImpl & DateLUT::get(const std::string & time_zone)
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{
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2015-06-26 17:57:49 +00:00
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auto it = time_zone_to_group.find(time_zone);
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if (it == time_zone_to_group.end())
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2015-06-26 15:11:31 +00:00
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throw Poco::Exception("Invalid time zone " + time_zone);
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2015-06-26 17:57:49 +00:00
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const auto & group_id = it->second;
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auto it2 = date_lut_impl_list.find(group_id);
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if (it2 == date_lut_impl_list.end())
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throw Poco::Exception("Invalid group of equivalent time zones.");
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2013-08-11 03:40:14 +00:00
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2015-06-26 17:57:49 +00:00
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auto & wrapper = it2->second;
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2013-08-11 03:40:14 +00:00
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2015-06-26 15:11:31 +00:00
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DateLUTImpl * tmp = wrapper.load(std::memory_order_acquire);
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if (tmp == nullptr)
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2013-08-11 03:40:14 +00:00
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{
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2015-06-26 17:57:49 +00:00
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std::lock_guard<std::mutex> guard(mutex);
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2015-06-26 15:11:31 +00:00
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tmp = wrapper.load(std::memory_order_acquire);
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if (tmp == nullptr)
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{
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tmp = new DateLUTImpl(time_zone);
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wrapper.store(tmp, std::memory_order_release);
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}
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2013-08-11 03:40:14 +00:00
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}
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2015-06-26 15:11:31 +00:00
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return *tmp;
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2009-05-28 18:19:51 +00:00
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}
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2015-06-26 15:11:31 +00:00
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