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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 TIMEZONE_HH
#define TIMEZONE_HH
// This file is for timezone routines.
#include "Adaptor.hh"
#include <stdint.h>
#include <memory>
#include <stdexcept>
#include <string>
#include <vector>
namespace orc {
static const int64_t SECONDS_PER_HOUR = 60 * 60;
static const int64_t SECONDS_PER_DAY = SECONDS_PER_HOUR * 24;
/**
* A variant (eg. PST or PDT) of a timezone (eg. America/Los_Angeles).
*/
struct TimezoneVariant {
int64_t gmtOffset;
bool isDst;
std::string name;
bool hasSameTzRule(const TimezoneVariant& other) const {
return gmtOffset == other.gmtOffset && isDst == other.isDst;
}
std::string toString() const;
};
/**
* A region that shares the same legal rules for wall clock time and
* day light savings transitions. They are typically named for the largest
* city in the region (eg. America/Los_Angeles or America/Mexico_City).
*/
class Timezone {
public:
virtual ~Timezone();
/**
* Get the variant for the given time (time_t).
*/
virtual const TimezoneVariant& getVariant(int64_t clk) const = 0;
/**
* Get the number of seconds between the ORC epoch in this timezone
* and Unix epoch.
* ORC epoch is 1 Jan 2015 00:00:00 local.
* Unix epoch is 1 Jan 1970 00:00:00 UTC.
*/
virtual int64_t getEpoch() const = 0;
/**
* Print the timezone to the stream.
*/
virtual void print(std::ostream&) const = 0;
/**
* Get the version of the zone file.
*/
virtual uint64_t getVersion() const = 0;
/**
* Convert wall clock time of current timezone to UTC timezone
*/
virtual int64_t convertToUTC(int64_t clk) const = 0;
/**
* Convert UTC timezone to wall clock time of current timezone
*/
virtual int64_t convertFromUTC(int64_t clk) const = 0;
};
/**
* Get the local timezone.
* Results are cached.
*/
const Timezone& getLocalTimezone();
/**
* Get a timezone by name (eg. America/Los_Angeles).
* Results are cached.
*/
const Timezone& getTimezoneByName(const std::string& zone);
/**
* Parse a set of bytes as a timezone file as if they came from filename.
*/
std::unique_ptr<Timezone> getTimezone(const std::string& filename,
const std::vector<unsigned char>& b);
class TimezoneError : public std::runtime_error {
public:
explicit TimezoneError(const std::string& what);
explicit TimezoneError(const TimezoneError&);
~TimezoneError() noexcept override;
};
/**
* Represents the parsed POSIX timezone rule strings that are used to
* describe the future transitions, because they can go arbitrarily far into
* the future.
*/
class FutureRule {
public:
virtual ~FutureRule();
virtual bool isDefined() const = 0;
virtual const TimezoneVariant& getVariant(int64_t clk) const = 0;
virtual void print(std::ostream& out) const = 0;
};
/**
* Parse the POSIX TZ string.
*/
std::shared_ptr<FutureRule> parseFutureRule(const std::string& ruleString);
} // namespace orc
#endif
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