530 lines
20 KiB
C++
530 lines
20 KiB
C++
#ifndef LOCAL_TIME_LOCAL_DATE_TIME_HPP__
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#define LOCAL_TIME_LOCAL_DATE_TIME_HPP__
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/* Copyright (c) 2003-2005 CrystalClear Software, Inc.
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* Subject to the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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* Author: Jeff Garland, Bart Garst
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* $Date$
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*/
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#include <string>
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#include <iomanip>
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#include <sstream>
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#include <stdexcept>
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#include <boost/shared_ptr.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/date_time/time.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp> //todo remove?
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#include <boost/date_time/compiler_config.hpp>
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#include <boost/date_time/dst_rules.hpp>
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#include <boost/date_time/time_zone_base.hpp>
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#include <boost/date_time/special_defs.hpp>
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#include <boost/date_time/time_resolution_traits.hpp> // absolute_value
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namespace boost {
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namespace local_time {
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//! simple exception for reporting when STD or DST cannot be determined
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struct BOOST_SYMBOL_VISIBLE ambiguous_result : public std::logic_error
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{
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ambiguous_result (std::string const& msg = std::string()) :
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std::logic_error(std::string("Daylight Savings Results are ambiguous: " + msg)) {}
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};
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//! simple exception for when time label given cannot exist
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struct BOOST_SYMBOL_VISIBLE time_label_invalid : public std::logic_error
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{
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time_label_invalid (std::string const& msg = std::string()) :
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std::logic_error(std::string("Time label given is invalid: " + msg)) {}
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};
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struct BOOST_SYMBOL_VISIBLE dst_not_valid: public std::logic_error
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{
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dst_not_valid(std::string const& msg = std::string()) :
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std::logic_error(std::string("is_dst flag does not match resulting dst for time label given: " + msg)) {}
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};
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//TODO: I think these should be in local_date_time_base and not
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// necessarily brought into the namespace
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using date_time::time_is_dst_result;
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using date_time::is_in_dst;
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using date_time::is_not_in_dst;
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using date_time::ambiguous;
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using date_time::invalid_time_label;
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//! Representation of "wall-clock" time in a particular time zone
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/*! Representation of "wall-clock" time in a particular time zone
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* Local_date_time_base holds a time value (date and time offset from 00:00)
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* along with a time zone. The time value is stored as UTC and conversions
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* to wall clock time are made as needed. This approach allows for
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* operations between wall-clock times in different time zones, and
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* daylight savings time considerations, to be made. Time zones are
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* required to be in the form of a boost::shared_ptr<time_zone_base>.
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*/
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template<class utc_time_=posix_time::ptime,
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class tz_type=date_time::time_zone_base<utc_time_,char> >
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class BOOST_SYMBOL_VISIBLE local_date_time_base : public date_time::base_time<utc_time_,
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boost::posix_time::posix_time_system> {
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public:
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typedef utc_time_ utc_time_type;
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typedef typename utc_time_type::time_duration_type time_duration_type;
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typedef typename utc_time_type::date_type date_type;
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typedef typename date_type::duration_type date_duration_type;
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typedef typename utc_time_type::time_system_type time_system_type;
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/*! This constructor interprets the passed time as a UTC time.
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* So, for example, if the passed timezone is UTC-5 then the
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* time will be adjusted back 5 hours. The time zone allows for
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* automatic calculation of whether the particular time is adjusted for
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* daylight savings, etc.
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* If the time zone shared pointer is null then time stays unadjusted.
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*@param t A UTC time
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*@param tz Timezone for to adjust the UTC time to.
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*/
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local_date_time_base(utc_time_type t,
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boost::shared_ptr<tz_type> tz) :
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date_time::base_time<utc_time_type, time_system_type>(t),
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zone_(tz)
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{
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// param was already utc so nothing more to do
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}
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/*! This constructs a local time -- the passed time information
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* understood to be in the passed tz. The DST flag must be passed
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* to indicate whether the time is in daylight savings or not.
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* @throws -- time_label_invalid if the time passed does not exist in
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* the given locale. The non-existent case occurs typically
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* during the shift-back from daylight savings time. When
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* the clock is shifted forward a range of times
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* (2 am to 3 am in the US) is skipped and hence is invalid.
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* @throws -- dst_not_valid if the DST flag is passed for a period
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* where DST is not active.
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*/
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local_date_time_base(date_type d,
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time_duration_type td,
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boost::shared_ptr<tz_type> tz,
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bool dst_flag) : //necessary for constr_adj()
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date_time::base_time<utc_time_type,time_system_type>(construction_adjustment(utc_time_type(d, td), tz, dst_flag)),
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zone_(tz)
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{
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if(tz != boost::shared_ptr<tz_type>() && tz->has_dst()){
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// d & td are already local so we use them
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time_is_dst_result result = check_dst(d, td, tz);
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bool in_dst = (result == is_in_dst); // less processing than is_dst()
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// ambig occurs at end, invalid at start
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if(result == invalid_time_label){
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// Ex: 2:15am local on trans-in day in nyc, dst_flag irrelevant
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std::ostringstream ss;
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ss << "time given: " << d << ' ' << td;
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boost::throw_exception(time_label_invalid(ss.str()));
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}
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else if(result != ambiguous && in_dst != dst_flag){
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// is dst_flag accurate?
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// Ex: false flag in NYC in June
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std::ostringstream ss;
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ss.setf(std::ios_base::boolalpha);
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ss << "flag given: dst=" << dst_flag << ", dst calculated: dst=" << in_dst;
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boost::throw_exception(dst_not_valid(ss.str()));
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}
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// everything checks out and conversion to utc already done
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}
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}
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//TODO maybe not the right set...Ignore the last 2 for now...
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enum DST_CALC_OPTIONS { EXCEPTION_ON_ERROR, NOT_DATE_TIME_ON_ERROR };
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//ASSUME_DST_ON_ERROR, ASSUME_NOT_DST_ON_ERROR };
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/*! This constructs a local time -- the passed time information
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* understood to be in the passed tz. The DST flag is calculated
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* according to the specified rule.
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*/
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local_date_time_base(date_type d,
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time_duration_type td,
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boost::shared_ptr<tz_type> tz,
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DST_CALC_OPTIONS calc_option) :
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// dummy value - time_ is set in constructor code
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date_time::base_time<utc_time_type,time_system_type>(utc_time_type(d,td)),
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zone_(tz)
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{
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time_is_dst_result result = check_dst(d, td, tz);
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if(result == ambiguous) {
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if(calc_option == EXCEPTION_ON_ERROR){
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std::ostringstream ss;
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ss << "time given: " << d << ' ' << td;
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boost::throw_exception(ambiguous_result(ss.str()));
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}
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else{ // NADT on error
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this->time_ = posix_time::posix_time_system::get_time_rep(date_type(date_time::not_a_date_time), time_duration_type(date_time::not_a_date_time));
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}
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}
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else if(result == invalid_time_label){
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if(calc_option == EXCEPTION_ON_ERROR){
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std::ostringstream ss;
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ss << "time given: " << d << ' ' << td;
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boost::throw_exception(time_label_invalid(ss.str()));
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}
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else{ // NADT on error
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this->time_ = posix_time::posix_time_system::get_time_rep(date_type(date_time::not_a_date_time), time_duration_type(date_time::not_a_date_time));
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}
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}
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else if(result == is_in_dst){
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utc_time_type t =
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construction_adjustment(utc_time_type(d, td), tz, true);
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this->time_ = posix_time::posix_time_system::get_time_rep(t.date(),
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t.time_of_day());
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}
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else{
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utc_time_type t =
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construction_adjustment(utc_time_type(d, td), tz, false);
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this->time_ = posix_time::posix_time_system::get_time_rep(t.date(),
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t.time_of_day());
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}
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}
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//! Determines if given time label is in daylight savings for given zone
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/*! Determines if given time label is in daylight savings for given zone.
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* Takes a date and time_duration representing a local time, along
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* with time zone, and returns a time_is_dst_result object as result.
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*/
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static time_is_dst_result check_dst(date_type d,
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time_duration_type td,
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boost::shared_ptr<tz_type> tz)
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{
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if(tz != boost::shared_ptr<tz_type>() && tz->has_dst()) {
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typedef typename date_time::dst_calculator<date_type, time_duration_type> dst_calculator;
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return dst_calculator::local_is_dst(
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d, td,
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tz->dst_local_start_time(d.year()).date(),
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tz->dst_local_start_time(d.year()).time_of_day(),
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tz->dst_local_end_time(d.year()).date(),
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tz->dst_local_end_time(d.year()).time_of_day(),
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tz->dst_offset()
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);
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}
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else{
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return is_not_in_dst;
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}
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}
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//! Simple destructor, releases time zone if last referrer
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~local_date_time_base() {}
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//! Copy constructor
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local_date_time_base(const local_date_time_base& rhs) :
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date_time::base_time<utc_time_type, time_system_type>(rhs),
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zone_(rhs.zone_)
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{}
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//! Special values constructor
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explicit local_date_time_base(const boost::date_time::special_values sv,
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boost::shared_ptr<tz_type> tz = boost::shared_ptr<tz_type>()) :
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date_time::base_time<utc_time_type, time_system_type>(utc_time_type(sv)),
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zone_(tz)
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{}
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//! returns time zone associated with calling instance
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boost::shared_ptr<tz_type> zone() const
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{
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return zone_;
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}
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//! returns false is time_zone is NULL and if time value is a special_value
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bool is_dst() const
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{
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if(zone_ != boost::shared_ptr<tz_type>() && zone_->has_dst() && !this->is_special()) {
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// check_dst takes a local time, *this is utc
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utc_time_type lt(this->time_);
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lt += zone_->base_utc_offset();
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// dst_offset only needs to be considered with ambiguous time labels
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// make that adjustment there
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switch(check_dst(lt.date(), lt.time_of_day(), zone_)){
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case is_not_in_dst:
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return false;
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case is_in_dst:
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return true;
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case ambiguous:
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if(lt + zone_->dst_offset() < zone_->dst_local_end_time(lt.date().year())) {
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return true;
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}
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break;
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case invalid_time_label:
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if(lt >= zone_->dst_local_start_time(lt.date().year())) {
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return true;
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}
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break;
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}
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}
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return false;
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}
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//! Returns object's time value as a utc representation
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utc_time_type utc_time() const
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{
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return utc_time_type(this->time_);
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}
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//! Returns object's time value as a local representation
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utc_time_type local_time() const
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{
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if(zone_ != boost::shared_ptr<tz_type>()){
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utc_time_type lt = this->utc_time() + zone_->base_utc_offset();
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if (is_dst()) {
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lt += zone_->dst_offset();
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}
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return lt;
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}
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return utc_time_type(this->time_);
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}
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//! Returns string in the form "2003-Aug-20 05:00:00 EDT"
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/*! Returns string in the form "2003-Aug-20 05:00:00 EDT". If
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* time_zone is NULL the time zone abbreviation will be "UTC". The time
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* zone abbrev will not be included if calling object is a special_value*/
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std::string to_string() const
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{
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//TODO is this a temporary function ???
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std::ostringstream ss;
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if(this->is_special()){
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ss << utc_time();
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return ss.str();
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}
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if(zone_ == boost::shared_ptr<tz_type>()) {
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ss << utc_time() << " UTC";
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return ss.str();
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}
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bool is_dst_ = is_dst();
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utc_time_type lt = this->utc_time() + zone_->base_utc_offset();
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if (is_dst_) {
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lt += zone_->dst_offset();
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}
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ss << local_time() << " ";
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if (is_dst()) {
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ss << zone_->dst_zone_abbrev();
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}
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else {
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ss << zone_->std_zone_abbrev();
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}
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return ss.str();
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}
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/*! returns a local_date_time_base in the given time zone with the
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* optional time_duration added. */
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local_date_time_base local_time_in(boost::shared_ptr<tz_type> new_tz,
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time_duration_type td=time_duration_type(0,0,0)) const
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{
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return local_date_time_base(utc_time_type(this->time_) + td, new_tz);
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}
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//! Returns name of associated time zone or "Coordinated Universal Time".
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/*! Optional bool parameter will return time zone as an offset
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* (ie "+07:00" extended ISO 8601 format). Empty string is returned for
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* classes that do not use a time_zone */
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std::string zone_name(bool as_offset=false) const
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{
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if(zone_ == boost::shared_ptr<tz_type>()) {
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if(as_offset) {
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return std::string("Z");
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}
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else {
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return std::string("Coordinated Universal Time");
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}
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}
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if (is_dst()) {
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if(as_offset) {
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time_duration_type td = zone_->base_utc_offset();
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td += zone_->dst_offset();
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return zone_as_offset(td, ":");
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}
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else {
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return zone_->dst_zone_name();
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}
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}
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else {
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if(as_offset) {
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time_duration_type td = zone_->base_utc_offset();
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return zone_as_offset(td, ":");
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}
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else {
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return zone_->std_zone_name();
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}
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}
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}
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//! Returns abbreviation of associated time zone or "UTC".
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/*! Optional bool parameter will return time zone as an offset
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* (ie "+0700" ISO 8601 format). Empty string is returned for classes
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* that do not use a time_zone */
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std::string zone_abbrev(bool as_offset=false) const
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{
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if(zone_ == boost::shared_ptr<tz_type>()) {
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if(as_offset) {
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return std::string("Z");
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}
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else {
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return std::string("UTC");
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}
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}
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if (is_dst()) {
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if(as_offset) {
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time_duration_type td = zone_->base_utc_offset();
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td += zone_->dst_offset();
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return zone_as_offset(td, "");
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}
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else {
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return zone_->dst_zone_abbrev();
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}
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}
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else {
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if(as_offset) {
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time_duration_type td = zone_->base_utc_offset();
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return zone_as_offset(td, "");
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}
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else {
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return zone_->std_zone_abbrev();
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}
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}
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}
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//! returns a posix_time_zone string for the associated time_zone. If no time_zone, "UTC+00" is returned.
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std::string zone_as_posix_string() const
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{
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if(zone_ == shared_ptr<tz_type>()) {
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return std::string("UTC+00");
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}
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return zone_->to_posix_string();
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}
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//! Equality comparison operator
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/*bool operator==(const date_time::base_time<boost::posix_time::ptime,boost::posix_time::posix_time_system>& rhs) const
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{ // fails due to rhs.time_ being protected
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return date_time::base_time<boost::posix_time::ptime,boost::posix_time::posix_time_system>::operator==(rhs);
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//return this->time_ == rhs.time_;
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}*/
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//! Equality comparison operator
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bool operator==(const local_date_time_base& rhs) const
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{
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return time_system_type::is_equal(this->time_, rhs.time_);
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}
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//! Non-Equality comparison operator
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bool operator!=(const local_date_time_base& rhs) const
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{
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return !(*this == rhs);
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}
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//! Less than comparison operator
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bool operator<(const local_date_time_base& rhs) const
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{
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return time_system_type::is_less(this->time_, rhs.time_);
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}
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//! Less than or equal to comparison operator
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bool operator<=(const local_date_time_base& rhs) const
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{
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return (*this < rhs || *this == rhs);
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}
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//! Greater than comparison operator
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bool operator>(const local_date_time_base& rhs) const
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{
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return !(*this <= rhs);
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}
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//! Greater than or equal to comparison operator
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bool operator>=(const local_date_time_base& rhs) const
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{
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return (*this > rhs || *this == rhs);
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}
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//! Local_date_time + date_duration
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local_date_time_base operator+(const date_duration_type& dd) const
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{
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return local_date_time_base(time_system_type::add_days(this->time_,dd), zone_);
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}
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//! Local_date_time += date_duration
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local_date_time_base operator+=(const date_duration_type& dd)
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{
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this->time_ = time_system_type::add_days(this->time_,dd);
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return *this;
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}
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//! Local_date_time - date_duration
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local_date_time_base operator-(const date_duration_type& dd) const
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{
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return local_date_time_base(time_system_type::subtract_days(this->time_,dd), zone_);
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}
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//! Local_date_time -= date_duration
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local_date_time_base operator-=(const date_duration_type& dd)
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{
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this->time_ = time_system_type::subtract_days(this->time_,dd);
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return *this;
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}
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//! Local_date_time + time_duration
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local_date_time_base operator+(const time_duration_type& td) const
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{
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return local_date_time_base(time_system_type::add_time_duration(this->time_,td), zone_);
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}
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//! Local_date_time += time_duration
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local_date_time_base operator+=(const time_duration_type& td)
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{
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this->time_ = time_system_type::add_time_duration(this->time_,td);
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return *this;
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|
}
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|
//! Local_date_time - time_duration
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|
local_date_time_base operator-(const time_duration_type& td) const
|
|
{
|
|
return local_date_time_base(time_system_type::subtract_time_duration(this->time_,td), zone_);
|
|
}
|
|
//! Local_date_time -= time_duration
|
|
local_date_time_base operator-=(const time_duration_type& td)
|
|
{
|
|
this->time_ = time_system_type::subtract_time_duration(this->time_,td);
|
|
return *this;
|
|
}
|
|
//! local_date_time -= local_date_time --> time_duration_type
|
|
time_duration_type operator-(const local_date_time_base& rhs) const
|
|
{
|
|
return utc_time_type(this->time_) - utc_time_type(rhs.time_);
|
|
}
|
|
private:
|
|
boost::shared_ptr<tz_type> zone_;
|
|
//bool is_dst_;
|
|
|
|
/*! Adjust the passed in time to UTC?
|
|
*/
|
|
utc_time_type construction_adjustment(utc_time_type t,
|
|
boost::shared_ptr<tz_type> z,
|
|
bool dst_flag)
|
|
{
|
|
if(z != boost::shared_ptr<tz_type>()) {
|
|
if(dst_flag && z->has_dst()) {
|
|
t -= z->dst_offset();
|
|
} // else no adjust
|
|
t -= z->base_utc_offset();
|
|
}
|
|
return t;
|
|
}
|
|
|
|
/*! Simple formatting code -- todo remove this?
|
|
*/
|
|
std::string zone_as_offset(const time_duration_type& td,
|
|
const std::string& separator) const
|
|
{
|
|
std::ostringstream ss;
|
|
if(td.is_negative()) {
|
|
// a negative duration is represented as "-[h]h:mm"
|
|
// we require two digits for the hour. A positive duration
|
|
// with the %H flag will always give two digits
|
|
ss << "-";
|
|
}
|
|
else {
|
|
ss << "+";
|
|
}
|
|
ss << std::setw(2) << std::setfill('0')
|
|
<< date_time::absolute_value(td.hours())
|
|
<< separator
|
|
<< std::setw(2) << std::setfill('0')
|
|
<< date_time::absolute_value(td.minutes());
|
|
return ss.str();
|
|
}
|
|
};
|
|
|
|
//!Use the default parameters to define local_date_time
|
|
typedef local_date_time_base<> local_date_time;
|
|
|
|
} }
|
|
|
|
|
|
#endif
|