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1 | #ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___ |
2 | #define _DATE_TIME_ADJUST_FUNCTORS_HPP___ | |
3 | ||
4 | /* Copyright (c) 2002,2003 CrystalClear Software, Inc. | |
5 | * Use, modification and distribution is subject to the | |
6 | * Boost Software License, Version 1.0. (See accompanying | |
7 | * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) | |
8 | * Author: Jeff Garland, Bart Garst | |
9 | * $Date$ | |
10 | */ | |
11 | ||
12 | #include "boost/date_time/date.hpp" | |
13 | #include "boost/date_time/wrapping_int.hpp" | |
14 | ||
15 | namespace boost { | |
16 | namespace date_time { | |
17 | ||
18 | ||
19 | //! Functor to iterate a fixed number of days | |
20 | template<class date_type> | |
21 | class day_functor | |
22 | { | |
23 | public: | |
24 | typedef typename date_type::duration_type duration_type; | |
25 | day_functor(int f) : f_(f) {} | |
26 | duration_type get_offset(const date_type& d) const | |
27 | { | |
28 | // why is 'd' a parameter??? | |
29 | // fix compiler warnings | |
30 | d.year(); | |
31 | return duration_type(f_); | |
32 | } | |
33 | duration_type get_neg_offset(const date_type& d) const | |
34 | { | |
35 | // fix compiler warnings | |
36 | d.year(); | |
37 | return duration_type(-f_); | |
38 | } | |
39 | private: | |
40 | int f_; | |
41 | }; | |
42 | ||
43 | ||
44 | //! Provides calculation to find next nth month given a date | |
45 | /*! This adjustment function provides the logic for 'month-based' | |
46 | * advancement on a ymd based calendar. The policy it uses | |
47 | * to handle the non existant end of month days is to back | |
48 | * up to the last day of the month. Also, if the starting | |
49 | * date is the last day of a month, this functor will attempt | |
50 | * to adjust to the end of the month. | |
51 | ||
52 | */ | |
53 | template<class date_type> | |
54 | class month_functor | |
55 | { | |
56 | public: | |
57 | typedef typename date_type::duration_type duration_type; | |
58 | typedef typename date_type::calendar_type cal_type; | |
59 | typedef typename cal_type::ymd_type ymd_type; | |
60 | typedef typename cal_type::day_type day_type; | |
61 | ||
62 | month_functor(int f) : f_(f), origDayOfMonth_(0) {} | |
63 | duration_type get_offset(const date_type& d) const | |
64 | { | |
65 | ymd_type ymd(d.year_month_day()); | |
66 | if (origDayOfMonth_ == 0) { | |
67 | origDayOfMonth_ = ymd.day; | |
68 | day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); | |
69 | if (endOfMonthDay == ymd.day) { | |
70 | origDayOfMonth_ = -1; //force the value to the end of month | |
71 | } | |
72 | } | |
73 | typedef date_time::wrapping_int2<short,1,12> wrap_int2; | |
74 | typedef typename wrap_int2::int_type int_type; | |
75 | wrap_int2 wi(ymd.month); | |
76 | //calc the year wrap around, add() returns 0 or 1 if wrapped | |
77 | int_type year = wi.add(static_cast<int_type>(f_)); | |
78 | year = static_cast<int_type>(year + ymd.year); //calculate resulting year | |
79 | // std::cout << "trace wi: " << wi.as_int() << std::endl; | |
80 | // std::cout << "trace year: " << year << std::endl; | |
81 | //find the last day for the new month | |
82 | day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); | |
83 | //original was the end of month -- force to last day of month | |
84 | if (origDayOfMonth_ == -1) { | |
85 | return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; | |
86 | } | |
87 | day_type dayOfMonth = origDayOfMonth_; | |
88 | if (dayOfMonth > resultingEndOfMonthDay) { | |
89 | dayOfMonth = resultingEndOfMonthDay; | |
90 | } | |
91 | return date_type(year, wi.as_int(), dayOfMonth) - d; | |
92 | } | |
93 | //! Returns a negative duration_type | |
94 | duration_type get_neg_offset(const date_type& d) const | |
95 | { | |
96 | ymd_type ymd(d.year_month_day()); | |
97 | if (origDayOfMonth_ == 0) { | |
98 | origDayOfMonth_ = ymd.day; | |
99 | day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); | |
100 | if (endOfMonthDay == ymd.day) { | |
101 | origDayOfMonth_ = -1; //force the value to the end of month | |
102 | } | |
103 | } | |
104 | typedef date_time::wrapping_int2<short,1,12> wrap_int2; | |
105 | typedef typename wrap_int2::int_type int_type; | |
106 | wrap_int2 wi(ymd.month); | |
107 | //calc the year wrap around, add() returns 0 or 1 if wrapped | |
108 | int_type year = wi.subtract(static_cast<int_type>(f_)); | |
109 | year = static_cast<int_type>(year + ymd.year); //calculate resulting year | |
110 | //find the last day for the new month | |
111 | day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); | |
112 | //original was the end of month -- force to last day of month | |
113 | if (origDayOfMonth_ == -1) { | |
114 | return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; | |
115 | } | |
116 | day_type dayOfMonth = origDayOfMonth_; | |
117 | if (dayOfMonth > resultingEndOfMonthDay) { | |
118 | dayOfMonth = resultingEndOfMonthDay; | |
119 | } | |
120 | return date_type(year, wi.as_int(), dayOfMonth) - d; | |
121 | } | |
122 | private: | |
123 | int f_; | |
124 | mutable short origDayOfMonth_; | |
125 | }; | |
126 | ||
127 | ||
128 | //! Functor to iterate a over weeks | |
129 | template<class date_type> | |
130 | class week_functor | |
131 | { | |
132 | public: | |
133 | typedef typename date_type::duration_type duration_type; | |
134 | typedef typename date_type::calendar_type calendar_type; | |
135 | week_functor(int f) : f_(f) {} | |
136 | duration_type get_offset(const date_type& d) const | |
137 | { | |
138 | // why is 'd' a parameter??? | |
139 | // fix compiler warnings | |
140 | d.year(); | |
141 | return duration_type(f_*calendar_type::days_in_week()); | |
142 | } | |
143 | duration_type get_neg_offset(const date_type& d) const | |
144 | { | |
145 | // fix compiler warnings | |
146 | d.year(); | |
147 | return duration_type(-f_*calendar_type::days_in_week()); | |
148 | } | |
149 | private: | |
150 | int f_; | |
151 | }; | |
152 | ||
153 | //! Functor to iterate by a year adjusting for leap years | |
154 | template<class date_type> | |
155 | class year_functor | |
156 | { | |
157 | public: | |
158 | //typedef typename date_type::year_type year_type; | |
159 | typedef typename date_type::duration_type duration_type; | |
160 | year_functor(int f) : _mf(f * 12) {} | |
161 | duration_type get_offset(const date_type& d) const | |
162 | { | |
163 | return _mf.get_offset(d); | |
164 | } | |
165 | duration_type get_neg_offset(const date_type& d) const | |
166 | { | |
167 | return _mf.get_neg_offset(d); | |
168 | } | |
169 | private: | |
170 | month_functor<date_type> _mf; | |
171 | }; | |
172 | ||
173 | ||
174 | } }//namespace date_time | |
175 | ||
176 | ||
177 | #endif | |
178 |