510 lines
16 KiB
C++
510 lines
16 KiB
C++
#ifndef DATE_TIME_DATE_GENERATORS_HPP__
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#define DATE_TIME_DATE_GENERATORS_HPP__
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/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
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* Use, modification and distribution is subject to the
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* Boost Software License, Version 1.0. (See accompanying
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* 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: 2012-09-22 15:33:33 -0700 (Sat, 22 Sep 2012) $
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*/
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/*! @file date_generators.hpp
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Definition and implementation of date algorithm templates
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*/
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#include <stdexcept>
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#include <sstream>
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#include <boost/throw_exception.hpp>
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#include <boost/date_time/date.hpp>
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#include <boost/date_time/compiler_config.hpp>
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namespace boost {
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namespace date_time {
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//! Base class for all generators that take a year and produce a date.
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/*! This class is a base class for polymorphic function objects that take
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a year and produce a concrete date.
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@param date_type The type representing a date. This type must
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export a calender_type which defines a year_type.
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*/
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template<class date_type>
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class year_based_generator
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::year_type year_type;
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year_based_generator() {}
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virtual ~year_based_generator() {}
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virtual date_type get_date(year_type y) const = 0;
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//! Returns a string for use in a POSIX time_zone string
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virtual std::string to_string() const =0;
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};
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//! Generates a date by applying the year to the given month and day.
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/*!
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Example usage:
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@code
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partial_date pd(1, Jan);
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partial_date pd2(70);
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date d = pd.get_date(2002); //2002-Jan-01
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date d2 = pd2.get_date(2002); //2002-Mar-10
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@endcode
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\ingroup date_alg
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*/
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template<class date_type>
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class partial_date : public year_based_generator<date_type>
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_type day_type;
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typedef typename calendar_type::month_type month_type;
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typedef typename calendar_type::year_type year_type;
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typedef typename date_type::duration_type duration_type;
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typedef typename duration_type::duration_rep duration_rep;
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partial_date(day_type d, month_type m) :
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day_(d),
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month_(m)
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{}
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//! Partial date created from number of days into year. Range 1-366
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/*! Allowable values range from 1 to 366. 1=Jan1, 366=Dec31. If argument
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* exceeds range, partial_date will be created with closest in-range value.
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* 60 will always be Feb29, if get_date() is called with a non-leap year
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* an exception will be thrown */
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partial_date(duration_rep days) :
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day_(1), // default values
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month_(1)
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{
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date_type d1(2000,1,1);
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if(days > 1) {
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if(days > 366) // prevents wrapping
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{
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days = 366;
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}
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days = days - 1;
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duration_type dd(days);
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d1 = d1 + dd;
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}
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day_ = d1.day();
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month_ = d1.month();
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}
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//! Return a concrete date when provided with a year specific year.
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/*! Will throw an 'invalid_argument' exception if a partial_date object,
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* instantiated with Feb-29, has get_date called with a non-leap year.
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* Example:
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* @code
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* partial_date pd(29, Feb);
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* pd.get_date(2003); // throws invalid_argument exception
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* pg.get_date(2000); // returns 2000-2-29
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* @endcode
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*/
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date_type get_date(year_type y) const
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{
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if((day_ == 29) && (month_ == 2) && !(calendar_type::is_leap_year(y))) {
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std::ostringstream ss;
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ss << "No Feb 29th in given year of " << y << ".";
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boost::throw_exception(std::invalid_argument(ss.str()));
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}
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return date_type(y, month_, day_);
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}
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date_type operator()(year_type y) const
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{
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return get_date(y);
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//return date_type(y, month_, day_);
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}
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bool operator==(const partial_date& rhs) const
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{
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return (month_ == rhs.month_) && (day_ == rhs.day_);
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}
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bool operator<(const partial_date& rhs) const
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{
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if (month_ < rhs.month_) return true;
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if (month_ > rhs.month_) return false;
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//months are equal
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return (day_ < rhs.day_);
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}
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// added for streaming purposes
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month_type month() const
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{
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return month_;
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}
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day_type day() const
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{
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return day_;
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}
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//! Returns string suitable for use in POSIX time zone string
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/*! Returns string formatted with up to 3 digits:
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* Jan-01 == "0"
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* Feb-29 == "58"
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* Dec-31 == "365" */
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virtual std::string to_string() const
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{
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std::ostringstream ss;
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date_type d(2004, month_, day_);
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unsigned short c = d.day_of_year();
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c--; // numbered 0-365 while day_of_year is 1 based...
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ss << c;
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return ss.str();
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}
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private:
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day_type day_;
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month_type month_;
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};
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//! Returns nth arg as string. 1 -> "first", 2 -> "second", max is 5.
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BOOST_DATE_TIME_DECL const char* nth_as_str(int n);
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//! Useful generator functor for finding holidays
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/*! Based on the idea in Cal. Calc. for finding holidays that are
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* the 'first Monday of September'. When instantiated with
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* 'fifth' kday of month, the result will be the last kday of month
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* which can be the fourth or fifth depending on the structure of
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* the month.
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*
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* The algorithm here basically guesses for the first
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* day of the month. Then finds the first day of the correct
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* type. That is, if the first of the month is a Tuesday
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* and it needs Wenesday then we simply increment by a day
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* and then we can add the length of a week until we get
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* to the 'nth kday'. There are probably more efficient
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* algorithms based on using a mod 7, but this one works
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* reasonably well for basic applications.
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* \ingroup date_alg
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*/
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template<class date_type>
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class nth_kday_of_month : public year_based_generator<date_type>
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_of_week_type day_of_week_type;
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typedef typename calendar_type::month_type month_type;
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typedef typename calendar_type::year_type year_type;
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typedef typename date_type::duration_type duration_type;
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enum week_num {first=1, second, third, fourth, fifth};
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nth_kday_of_month(week_num week_no,
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day_of_week_type dow,
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month_type m) :
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month_(m),
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wn_(week_no),
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dow_(dow)
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{}
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//! Return a concrete date when provided with a year specific year.
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date_type get_date(year_type y) const
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{
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date_type d(y, month_, 1); //first day of month
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duration_type one_day(1);
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duration_type one_week(7);
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while (dow_ != d.day_of_week()) {
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d = d + one_day;
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}
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int week = 1;
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while (week < wn_) {
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d = d + one_week;
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week++;
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}
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// remove wrapping to next month behavior
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if(d.month() != month_) {
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d = d - one_week;
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}
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return d;
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}
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// added for streaming
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month_type month() const
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{
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return month_;
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}
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week_num nth_week() const
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{
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return wn_;
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}
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day_of_week_type day_of_week() const
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{
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return dow_;
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}
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const char* nth_week_as_str() const
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{
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return nth_as_str(wn_);
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}
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//! Returns string suitable for use in POSIX time zone string
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/*! Returns a string formatted as "M4.3.0" ==> 3rd Sunday in April. */
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virtual std::string to_string() const
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{
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std::ostringstream ss;
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ss << 'M'
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<< static_cast<int>(month_) << '.'
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<< static_cast<int>(wn_) << '.'
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<< static_cast<int>(dow_);
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return ss.str();
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}
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private:
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month_type month_;
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week_num wn_;
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day_of_week_type dow_;
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};
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//! Useful generator functor for finding holidays and daylight savings
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/*! Similar to nth_kday_of_month, but requires less paramters
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* \ingroup date_alg
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*/
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template<class date_type>
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class first_kday_of_month : public year_based_generator<date_type>
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_of_week_type day_of_week_type;
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typedef typename calendar_type::month_type month_type;
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typedef typename calendar_type::year_type year_type;
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typedef typename date_type::duration_type duration_type;
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//!Specify the first 'Sunday' in 'April' spec
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/*!@param dow The day of week, eg: Sunday, Monday, etc
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* @param m The month of the year, eg: Jan, Feb, Mar, etc
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*/
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first_kday_of_month(day_of_week_type dow, month_type m) :
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month_(m),
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dow_(dow)
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{}
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//! Return a concrete date when provided with a year specific year.
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date_type get_date(year_type year) const
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{
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date_type d(year, month_,1);
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duration_type one_day(1);
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while (dow_ != d.day_of_week()) {
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d = d + one_day;
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}
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return d;
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}
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// added for streaming
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month_type month() const
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{
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return month_;
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}
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day_of_week_type day_of_week() const
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{
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return dow_;
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}
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//! Returns string suitable for use in POSIX time zone string
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/*! Returns a string formatted as "M4.1.0" ==> 1st Sunday in April. */
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virtual std::string to_string() const
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{
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std::ostringstream ss;
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ss << 'M'
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<< static_cast<int>(month_) << '.'
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<< 1 << '.'
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<< static_cast<int>(dow_);
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return ss.str();
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}
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private:
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month_type month_;
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day_of_week_type dow_;
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};
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//! Calculate something like Last Sunday of January
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/*! Useful generator functor for finding holidays and daylight savings
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* Get the last day of the month and then calculate the difference
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* to the last previous day.
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* @param date_type A date class that exports day_of_week, month_type, etc.
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* \ingroup date_alg
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*/
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template<class date_type>
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class last_kday_of_month : public year_based_generator<date_type>
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_of_week_type day_of_week_type;
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typedef typename calendar_type::month_type month_type;
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typedef typename calendar_type::year_type year_type;
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typedef typename date_type::duration_type duration_type;
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//!Specify the date spec like last 'Sunday' in 'April' spec
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/*!@param dow The day of week, eg: Sunday, Monday, etc
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* @param m The month of the year, eg: Jan, Feb, Mar, etc
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*/
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last_kday_of_month(day_of_week_type dow, month_type m) :
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month_(m),
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dow_(dow)
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{}
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//! Return a concrete date when provided with a year specific year.
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date_type get_date(year_type year) const
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{
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date_type d(year, month_, calendar_type::end_of_month_day(year,month_));
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duration_type one_day(1);
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while (dow_ != d.day_of_week()) {
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d = d - one_day;
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}
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return d;
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}
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// added for streaming
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month_type month() const
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{
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return month_;
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}
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day_of_week_type day_of_week() const
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{
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return dow_;
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}
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//! Returns string suitable for use in POSIX time zone string
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/*! Returns a string formatted as "M4.5.0" ==> last Sunday in April. */
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virtual std::string to_string() const
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{
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std::ostringstream ss;
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ss << 'M'
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<< static_cast<int>(month_) << '.'
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<< 5 << '.'
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<< static_cast<int>(dow_);
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return ss.str();
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}
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private:
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month_type month_;
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day_of_week_type dow_;
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};
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//! Calculate something like "First Sunday after Jan 1,2002
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/*! Date generator that takes a date and finds kday after
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*@code
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typedef boost::date_time::first_kday_after<date> firstkdayafter;
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firstkdayafter fkaf(Monday);
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fkaf.get_date(date(2002,Feb,1));
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@endcode
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* \ingroup date_alg
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*/
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template<class date_type>
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class first_kday_after
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_of_week_type day_of_week_type;
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typedef typename date_type::duration_type duration_type;
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first_kday_after(day_of_week_type dow) :
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dow_(dow)
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{}
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//! Return next kday given.
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date_type get_date(date_type start_day) const
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{
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duration_type one_day(1);
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date_type d = start_day + one_day;
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while (dow_ != d.day_of_week()) {
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d = d + one_day;
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}
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return d;
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}
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// added for streaming
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day_of_week_type day_of_week() const
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{
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return dow_;
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}
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private:
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day_of_week_type dow_;
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};
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//! Calculate something like "First Sunday before Jan 1,2002
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/*! Date generator that takes a date and finds kday after
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*@code
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typedef boost::date_time::first_kday_before<date> firstkdaybefore;
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firstkdaybefore fkbf(Monday);
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fkbf.get_date(date(2002,Feb,1));
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@endcode
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* \ingroup date_alg
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*/
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template<class date_type>
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class first_kday_before
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{
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public:
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typedef typename date_type::calendar_type calendar_type;
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typedef typename calendar_type::day_of_week_type day_of_week_type;
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typedef typename date_type::duration_type duration_type;
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first_kday_before(day_of_week_type dow) :
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dow_(dow)
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{}
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//! Return next kday given.
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date_type get_date(date_type start_day) const
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{
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duration_type one_day(1);
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date_type d = start_day - one_day;
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while (dow_ != d.day_of_week()) {
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d = d - one_day;
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}
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return d;
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}
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// added for streaming
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day_of_week_type day_of_week() const
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{
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return dow_;
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}
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private:
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day_of_week_type dow_;
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};
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//! Calculates the number of days until the next weekday
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/*! Calculates the number of days until the next weekday.
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* If the date given falls on a Sunday and the given weekday
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* is Tuesday the result will be 2 days */
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template<typename date_type, class weekday_type>
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inline
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typename date_type::duration_type days_until_weekday(const date_type& d, const weekday_type& wd)
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{
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typedef typename date_type::duration_type duration_type;
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duration_type wks(0);
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duration_type dd(wd.as_number() - d.day_of_week().as_number());
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if(dd.is_negative()){
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wks = duration_type(7);
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}
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return dd + wks;
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}
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//! Calculates the number of days since the previous weekday
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/*! Calculates the number of days since the previous weekday
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* If the date given falls on a Sunday and the given weekday
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* is Tuesday the result will be 5 days. The answer will be a positive
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* number because Tuesday is 5 days before Sunday, not -5 days before. */
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template<typename date_type, class weekday_type>
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inline
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typename date_type::duration_type days_before_weekday(const date_type& d, const weekday_type& wd)
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{
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typedef typename date_type::duration_type duration_type;
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duration_type wks(0);
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duration_type dd(wd.as_number() - d.day_of_week().as_number());
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if(dd.days() > 0){
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wks = duration_type(7);
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}
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// we want a number of days, not an offset. The value returned must
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// be zero or larger.
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return (-dd + wks);
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}
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//! Generates a date object representing the date of the following weekday from the given date
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/*! Generates a date object representing the date of the following
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* weekday from the given date. If the date given is 2004-May-9
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* (a Sunday) and the given weekday is Tuesday then the resulting date
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* will be 2004-May-11. */
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template<class date_type, class weekday_type>
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inline
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date_type next_weekday(const date_type& d, const weekday_type& wd)
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{
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return d + days_until_weekday(d, wd);
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}
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//! Generates a date object representing the date of the previous weekday from the given date
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/*! Generates a date object representing the date of the previous
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* weekday from the given date. If the date given is 2004-May-9
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* (a Sunday) and the given weekday is Tuesday then the resulting date
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* will be 2004-May-4. */
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template<class date_type, class weekday_type>
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inline
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date_type previous_weekday(const date_type& d, const weekday_type& wd)
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{
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return d - days_before_weekday(d, wd);
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}
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} } //namespace date_time
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#endif
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