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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_
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