source: NonGTP/Boost/boost/date_time/local_time/time_zone.hpp @ 857

Revision 857, 5.9 KB checked in by igarcia, 19 years ago (diff)
Line 
1#ifndef LOCAL_TIME_TIME_ZONE_HPP__
2#define LOCAL_TIME_TIME_ZONE_HPP__
3
4/* Copyright (c) 2003-2005 CrystalClear Software, Inc.
5 * Subject to the Boost Software License, Version 1.0.
6 * (See accompanying file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
7 * Author: Jeff Garland, Bart Garst
8 * $Date: 2005/04/17 21:48:19 $
9 */
10
11#include "boost/date_time/time_zone_base.hpp"
12#include "boost/date_time/time_zone_names.hpp"
13#include "boost/date_time/posix_time/posix_time.hpp"
14#include "boost/date_time/local_time/dst_transition_day_rules.hpp"
15//#include "boost/date_time/special_defs.hpp"
16#include "boost/shared_ptr.hpp"
17
18namespace boost {
19namespace local_time {
20
21  typedef boost::date_time::time_zone_names time_zone_names;
22  typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets;
23  typedef boost::date_time::time_zone_base<boost::posix_time::ptime> time_zone_base;
24  typedef boost::shared_ptr<dst_calc_rule> dst_calc_rule_ptr;
25
26  //! A real time zone
27  class time_zone : public time_zone_base {
28  public:
29    typedef boost::posix_time::time_duration time_duration_type;
30    typedef time_zone_base base_type;
31    typedef base_type::string_type string_type;
32    typedef base_type::stringstream_type stringstream_type;
33    time_zone(const time_zone_names& zone_names,   
34              const time_duration_type& base_utc_offset,
35              const dst_adjustment_offsets& dst_offset,
36              boost::shared_ptr<dst_calc_rule> calc_rule) :
37      zone_names_(zone_names),
38      base_utc_offset_(base_utc_offset),
39      dst_offsets_(dst_offset),
40      dst_calc_rules_(calc_rule)
41    {};
42    virtual ~time_zone() {};
43    virtual std::string dst_zone_abbrev() const
44    {
45      return zone_names_.dst_zone_abbrev();
46    }
47    virtual std::string std_zone_abbrev() const
48    {
49      return zone_names_.std_zone_abbrev();
50    }
51    virtual std::string dst_zone_name() const
52    {
53      return zone_names_.dst_zone_name();
54    }
55    virtual std::string std_zone_name() const
56    {
57      return zone_names_.std_zone_name();
58    }
59    //! True if zone uses daylight savings adjustments
60    virtual bool has_dst() const
61    {
62      return (dst_calc_rules_); //if calc_rule is set the tz has dst
63    }
64    //! Local time that DST starts -- NADT if has_dst is false
65    virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y) const
66    {
67      gregorian::date d(gregorian::not_a_date_time);
68      if (dst_calc_rules_) {
69        d = dst_calc_rules_->start_day(y);
70      }
71      return posix_time::ptime(d, dst_offsets_.dst_start_offset_);
72    }
73    //! Local time that DST ends -- NADT if has_dst is false
74    virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y) const
75    {
76      gregorian::date d(gregorian::not_a_date_time);
77      if (dst_calc_rules_) {
78        d = dst_calc_rules_->end_day(y);
79      }
80      return posix_time::ptime(d, dst_offsets_.dst_end_offset_);
81    }
82    //! Base offset from UTC for zone (eg: -07:30:00)
83    virtual time_duration_type base_utc_offset() const
84    {
85      return base_utc_offset_;
86    }
87    //! Adjustment forward or back made while DST is in effect
88    virtual time_duration_type dst_offset() const
89    {
90      return dst_offsets_.dst_adjust_;
91    }
92    //! Returns a POSIX time_zone string for this object
93    virtual string_type to_posix_string() const
94    {
95      // std offset dst [offset],start[/time],end[/time] - w/o spaces
96      stringstream_type ss;
97      ss.fill('0');
98      boost::shared_ptr<dst_calc_rule> no_rules;
99      // std
100      ss << std_zone_abbrev();
101      // offset
102      if(base_utc_offset().is_negative()) {
103        // inverting the sign guarantees we get two digits
104        ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours();
105      }
106      else {
107        ss << '+' << std::setw(2) << base_utc_offset().hours();
108      }
109      if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) {
110        ss << ':' << std::setw(2) << base_utc_offset().minutes();
111        if(base_utc_offset().seconds() != 0) {
112          ss << ':' << std::setw(2) << base_utc_offset().seconds();
113        }
114      }
115      if(dst_calc_rules_ != no_rules) {
116        // dst
117        ss << dst_zone_abbrev();
118        // dst offset
119        if(dst_offset().is_negative()) {
120          // inverting the sign guarantees we get two digits
121          ss << '-' << std::setw(2) << dst_offset().invert_sign().hours();
122        }
123        else {
124          ss << '+' << std::setw(2) << dst_offset().hours();
125        }
126        if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) {
127          ss << ':' << std::setw(2) << dst_offset().minutes();
128          if(dst_offset().seconds() != 0) {
129            ss << ':' << std::setw(2) << dst_offset().seconds();
130          }
131        }
132        // start/time
133        ss << ',' << dst_calc_rules_->start_rule_as_string() << '/'
134           << std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':'
135           << std::setw(2) << dst_offsets_.dst_start_offset_.minutes();
136        if(dst_offsets_.dst_start_offset_.seconds() != 0) {
137          ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds();
138        }
139        // end/time
140        ss << ',' << dst_calc_rules_->end_rule_as_string() << '/'
141           << std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':'
142           << std::setw(2) << dst_offsets_.dst_end_offset_.minutes();
143        if(dst_offsets_.dst_end_offset_.seconds() != 0) {
144          ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds();
145        }
146      }
147
148      return ss.str();
149    }
150  private:
151    time_zone_names zone_names_;
152    bool has_dst_;
153    time_duration_type base_utc_offset_;
154    dst_adjustment_offsets dst_offsets_;
155    boost::shared_ptr<dst_calc_rule> dst_calc_rules_;
156  };
157
158} }//namespace
159
160
161
162#endif
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