Abseil Common Libraries (C++) (grcp 依赖)
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90 lines
3.2 KiB
90 lines
3.2 KiB
// Copyright 2016 Google Inc. All Rights Reserved. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_ |
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#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_ |
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#include <memory> |
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#include <string> |
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#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
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#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
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#include "time_zone_if.h" |
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#include "time_zone_info.h" |
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namespace absl { |
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namespace time_internal { |
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namespace cctz { |
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// time_zone::Impl is the internal object referenced by a cctz::time_zone. |
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class time_zone::Impl { |
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public: |
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// The UTC time zone. Also used for other time zones that fail to load. |
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static time_zone UTC(); |
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// Load a named time zone. Returns false if the name is invalid, or if |
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// some other kind of error occurs. Note that loading "UTC" never fails. |
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static bool LoadTimeZone(const std::string& name, time_zone* tz); |
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// Clears the map of cached time zones. Primarily for use in benchmarks |
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// that gauge the performance of loading/parsing the time-zone data. |
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static void ClearTimeZoneMapTestOnly(); |
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// The primary key is the time-zone ID (e.g., "America/New_York"). |
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const std::string& Name() const { |
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// TODO: It would nice if the zoneinfo data included the zone name. |
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return name_; |
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} |
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// Breaks a time_point down to civil-time components in this time zone. |
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time_zone::absolute_lookup BreakTime(const time_point<seconds>& tp) const { |
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return zone_->BreakTime(tp); |
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} |
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// Converts the civil-time components in this time zone into a time_point. |
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// That is, the opposite of BreakTime(). The requested civil time may be |
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// ambiguous or illegal due to a change of UTC offset. |
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time_zone::civil_lookup MakeTime(const civil_second& cs) const { |
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return zone_->MakeTime(cs); |
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} |
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// Finds the time of the next/previous offset change in this time zone. |
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bool NextTransition(const time_point<seconds>& tp, |
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time_zone::civil_transition* trans) const { |
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return zone_->NextTransition(tp, trans); |
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} |
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bool PrevTransition(const time_point<seconds>& tp, |
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time_zone::civil_transition* trans) const { |
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return zone_->PrevTransition(tp, trans); |
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} |
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// Returns an implementation-defined version std::string for this time zone. |
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std::string Version() const { return zone_->Version(); } |
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// Returns an implementation-defined description of this time zone. |
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std::string Description() const { return zone_->Description(); } |
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private: |
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explicit Impl(const std::string& name); |
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static const Impl* UTCImpl(); |
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const std::string name_; |
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std::unique_ptr<TimeZoneIf> zone_; |
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}; |
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} // namespace cctz |
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} // namespace time_internal |
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} // namespace absl |
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#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
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