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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+#include "time_zone_if.h"
+#include "time_zone_info.h"
+
+namespace absl {
+namespace time_internal {
+namespace cctz {
+
+// time_zone::Impl is the internal object referenced by a cctz::time_zone.
+class time_zone::Impl {
+ public:
+ // The UTC time zone. Also used for other time zones that fail to load.
+ static time_zone UTC();
+
+ // Load a named time zone. Returns false if the name is invalid, or if
+ // some other kind of error occurs. Note that loading "UTC" never fails.
+ static bool LoadTimeZone(const std::string& name, time_zone* tz);
+
+ // Dereferences the time_zone to obtain its Impl.
+ static const time_zone::Impl& get(const time_zone& tz);
+
+ // Clears the map of cached time zones. Primarily for use in benchmarks
+ // that gauge the performance of loading/parsing the time-zone data.
+ static void ClearTimeZoneMapTestOnly();
+
+ // The primary key is the time-zone ID (e.g., "America/New_York").
+ const std::string& name() const { return name_; }
+
+ // Breaks a time_point down to civil-time components in this time zone.
+ time_zone::absolute_lookup BreakTime(
+ const time_point<sys_seconds>& tp) const {
+ return zone_->BreakTime(tp);
+ }
+
+ // Converts the civil-time components in this time zone into a time_point.
+ // That is, the opposite of BreakTime(). The requested civil time may be
+ // ambiguous or illegal due to a change of UTC offset.
+ time_zone::civil_lookup MakeTime(const civil_second& cs) const {
+ return zone_->MakeTime(cs);
+ }
+
+ // Returns an implementation-specific description of this time zone.
+ std::string Description() const { return zone_->Description(); }
+
+ // Finds the time of the next/previous offset change in this time zone.
+ //
+ // By definition, NextTransition(&tp) returns false when tp has its
+ // maximum value, and PrevTransition(&tp) returns false when tp has its
+ // mimimum value. If the zone has no transitions, the result will also
+ // be false no matter what the argument.
+ //
+ // Otherwise, when tp has its mimimum value, NextTransition(&tp) returns
+ // true and sets tp to the first recorded transition. Chains of calls
+ // to NextTransition()/PrevTransition() will eventually return false,
+ // but it is unspecified exactly when NextTransition(&tp) jumps to false,
+ // or what time is set by PrevTransition(&tp) for a very distant tp.
+ bool NextTransition(time_point<sys_seconds>* tp) const {
+ return zone_->NextTransition(tp);
+ }
+ bool PrevTransition(time_point<sys_seconds>* tp) const {
+ return zone_->PrevTransition(tp);
+ }
+
+ private:
+ explicit Impl(const std::string& name);
+ static const Impl* UTCImpl();
+
+ const std::string name_;
+ std::unique_ptr<TimeZoneIf> zone_;
+};
+
+} // namespace cctz
+} // namespace time_internal
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_