169 lines
6.1 KiB
C++
169 lines
6.1 KiB
C++
#ifndef LOCAL_TIME_CUSTOM_TIME_ZONE_HPP__
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#define LOCAL_TIME_CUSTOM_TIME_ZONE_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 "boost/date_time/time_zone_base.hpp"
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#include "boost/date_time/time_zone_names.hpp"
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#include "boost/date_time/posix_time/posix_time.hpp"
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#include "boost/date_time/local_time/dst_transition_day_rules.hpp"
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#include "boost/date_time/string_convert.hpp"
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//#include "boost/date_time/special_defs.hpp"
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#include "boost/shared_ptr.hpp"
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namespace boost {
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namespace local_time {
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//typedef boost::date_time::time_zone_names time_zone_names;
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typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets;
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//typedef boost::date_time::time_zone_base<boost::posix_time::ptime> time_zone;
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typedef boost::shared_ptr<dst_calc_rule> dst_calc_rule_ptr;
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//! A real time zone
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template<class CharT>
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class custom_time_zone_base : public date_time::time_zone_base<posix_time::ptime,CharT> {
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public:
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typedef boost::posix_time::time_duration time_duration_type;
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typedef date_time::time_zone_base<posix_time::ptime,CharT> base_type;
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typedef typename base_type::string_type string_type;
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typedef typename base_type::stringstream_type stringstream_type;
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typedef date_time::time_zone_names_base<CharT> time_zone_names;
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typedef CharT char_type;
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custom_time_zone_base(const time_zone_names& zone_names,
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const time_duration_type& utc_offset,
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const dst_adjustment_offsets& dst_shift,
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boost::shared_ptr<dst_calc_rule> calc_rule) :
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zone_names_(zone_names),
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base_utc_offset_(utc_offset),
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dst_offsets_(dst_shift),
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dst_calc_rules_(calc_rule)
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{}
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virtual ~custom_time_zone_base() {}
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virtual string_type dst_zone_abbrev() const
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{
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return zone_names_.dst_zone_abbrev();
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}
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virtual string_type std_zone_abbrev() const
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{
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return zone_names_.std_zone_abbrev();
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}
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virtual string_type dst_zone_name() const
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{
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return zone_names_.dst_zone_name();
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}
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virtual string_type std_zone_name() const
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{
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return zone_names_.std_zone_name();
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}
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//! True if zone uses daylight savings adjustments
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virtual bool has_dst() const
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{
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return (bool) dst_calc_rules_; //if calc_rule is set the tz has dst
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}
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//! Local time that DST starts -- NADT if has_dst is false
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virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y) const
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{
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gregorian::date d(gregorian::not_a_date_time);
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if (dst_calc_rules_) {
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d = dst_calc_rules_->start_day(y);
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}
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return posix_time::ptime(d, dst_offsets_.dst_start_offset_);
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}
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//! Local time that DST ends -- NADT if has_dst is false
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virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y) const
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{
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gregorian::date d(gregorian::not_a_date_time);
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if (dst_calc_rules_) {
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d = dst_calc_rules_->end_day(y);
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}
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return posix_time::ptime(d, dst_offsets_.dst_end_offset_);
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}
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//! Base offset from UTC for zone (eg: -07:30:00)
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virtual time_duration_type base_utc_offset() const
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{
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return base_utc_offset_;
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}
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//! Adjustment forward or back made while DST is in effect
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virtual time_duration_type dst_offset() const
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{
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return dst_offsets_.dst_adjust_;
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}
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//! Returns a POSIX time_zone string for this object
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virtual string_type to_posix_string() const
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{
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// std offset dst [offset],start[/time],end[/time] - w/o spaces
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stringstream_type ss;
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ss.fill('0');
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boost::shared_ptr<dst_calc_rule> no_rules;
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// std
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ss << std_zone_abbrev();
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// offset
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if(base_utc_offset().is_negative()) {
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// inverting the sign guarantees we get two digits
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ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours();
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}
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else {
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ss << '+' << std::setw(2) << base_utc_offset().hours();
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}
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if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << base_utc_offset().minutes();
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if(base_utc_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << base_utc_offset().seconds();
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}
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}
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if(dst_calc_rules_ != no_rules) {
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// dst
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ss << dst_zone_abbrev();
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// dst offset
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if(dst_offset().is_negative()) {
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// inverting the sign guarantees we get two digits
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ss << '-' << std::setw(2) << dst_offset().invert_sign().hours();
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}
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else {
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ss << '+' << std::setw(2) << dst_offset().hours();
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}
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if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offset().minutes();
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if(dst_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offset().seconds();
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}
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}
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// start/time
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ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->start_rule_as_string()) << '/'
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<< std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':'
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<< std::setw(2) << dst_offsets_.dst_start_offset_.minutes();
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if(dst_offsets_.dst_start_offset_.seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds();
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}
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// end/time
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ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->end_rule_as_string()) << '/'
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<< std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':'
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<< std::setw(2) << dst_offsets_.dst_end_offset_.minutes();
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if(dst_offsets_.dst_end_offset_.seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds();
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}
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}
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return ss.str();
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}
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private:
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time_zone_names zone_names_;
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time_duration_type base_utc_offset_;
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dst_adjustment_offsets dst_offsets_;
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boost::shared_ptr<dst_calc_rule> dst_calc_rules_;
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};
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typedef custom_time_zone_base<char> custom_time_zone;
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} }//namespace
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#endif
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