time_serialize.hpp

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#ifndef POSIX_TIME_SERIALIZE_HPP___
#define POSIX_TIME_SERIALIZE_HPP___

/* Copyright (c) 2004-2005 CrystalClear Software, Inc.
 * Use, modification and distribution is subject to the 
 * Boost Software License, Version 1.0. (See accompanying
 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
 * Author: Jeff Garland, Bart Garst
 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
 */

#include "boost/date_time/posix_time/posix_time.hpp"
#include "boost/date_time/gregorian/greg_serialize.hpp"
#include "boost/serialization/split_free.hpp"


// macros to split serialize functions into save & load functions
// NOTE: these macros define template functions in the boost::serialization namespace.
// They must be expanded *outside* of any namespace
BOOST_SERIALIZATION_SPLIT_FREE(boost::posix_time::ptime)
BOOST_SERIALIZATION_SPLIT_FREE(boost::posix_time::time_duration)
BOOST_SERIALIZATION_SPLIT_FREE(boost::posix_time::time_period)

namespace boost {
namespace serialization {


/*** time_duration ***/

//! Function to save posix_time::time_duration objects using serialization lib
/*! time_duration objects are broken down into 4 parts for serialization:
 * types are hour_type, min_type, sec_type, and fractional_seconds_type
 * as defined in the time_duration class
 */
template<class Archive>
void save(Archive & ar, 
          const posix_time::time_duration& td, 
          unsigned int /*version*/)
{
  // serialize a bool so we know how to read this back in later
  bool is_special = td.is_special();
  ar & make_nvp("is_special", is_special);
  if(is_special) {
    std::string s = to_simple_string(td);
    ar & make_nvp("sv_time_duration", s);
  }
  else {
    typename posix_time::time_duration::hour_type h = td.hours();
    typename posix_time::time_duration::min_type m = td.minutes();
    typename posix_time::time_duration::sec_type s = td.seconds();
    typename posix_time::time_duration::fractional_seconds_type fs = td.fractional_seconds();
    ar & make_nvp("time_duration_hours", h);
    ar & make_nvp("time_duration_minutes", m);
    ar & make_nvp("time_duration_seconds", s);
    ar & make_nvp("time_duration_fractional_seconds", fs);
  }
}

//! Function to load posix_time::time_duration objects using serialization lib
/*! time_duration objects are broken down into 4 parts for serialization:
 * types are hour_type, min_type, sec_type, and fractional_seconds_type
 * as defined in the time_duration class
 */
template<class Archive>
void load(Archive & ar, 
          posix_time::time_duration & td, 
          unsigned int /*version*/)
{
  bool is_special = false;
  ar & make_nvp("is_special", is_special);
  if(is_special) {
    std::string s;
    ar & make_nvp("sv_time_duration", s);
    posix_time::special_values sv = gregorian::special_value_from_string(s);
    td = posix_time::time_duration(sv);
  }
  else {
    typename posix_time::time_duration::hour_type h(0);
    typename posix_time::time_duration::min_type m(0);
    typename posix_time::time_duration::sec_type s(0);
    typename posix_time::time_duration::fractional_seconds_type fs(0);
    ar & make_nvp("time_duration_hours", h);
    ar & make_nvp("time_duration_minutes", m);
    ar & make_nvp("time_duration_seconds", s);
    ar & make_nvp("time_duration_fractional_seconds", fs);
    td = posix_time::time_duration(h,m,s,fs);
  }
}

// no load_construct_data function provided as time_duration provides a
// default constructor

/*** ptime ***/

//! Function to save posix_time::ptime objects using serialization lib
/*! ptime objects are broken down into 2 parts for serialization:
 * a date object and a time_duration onject
 */
template<class Archive>
void save(Archive & ar, 
          const posix_time::ptime& pt, 
          unsigned int /*version*/)
{
  // from_iso_string does not include fractional seconds
  // therefore date and time_duration are used
  typename posix_time::ptime::date_type d = pt.date();
  ar & make_nvp("ptime_date", d);
  if(!pt.is_special()) {
    typename posix_time::ptime::time_duration_type td = pt.time_of_day();
    ar & make_nvp("ptime_time_duration", td);
  }
}

//! Function to load posix_time::ptime objects using serialization lib
/*! ptime objects are broken down into 2 parts for serialization:
 * a date object and a time_duration onject
 */
template<class Archive>
void load(Archive & ar, 
          posix_time::ptime & pt, 
          unsigned int /*version*/)
{
  // from_iso_string does not include fractional seconds
  // therefore date and time_duration are used
  typename posix_time::ptime::date_type d(posix_time::not_a_date_time);
  typename posix_time::ptime::time_duration_type td;
  ar & make_nvp("ptime_date", d);
  if(!d.is_special()) {
    ar & make_nvp("ptime_time_duration", td);
    pt = boost::posix_time::ptime(d,td);
  }
  else {
    pt = boost::posix_time::ptime(d.as_special());
  }
    
}

//!override needed b/c no default constructor
template<class Archive>
inline void load_construct_data(Archive & ar, 
                                posix_time::ptime* pt, 
                                const unsigned int /*file_version*/)
{
  // retrieve data from archive required to construct new 
  // invoke inplace constructor to initialize instance of date
  new(pt) boost::posix_time::ptime(boost::posix_time::not_a_date_time);
}

/*** time_period ***/

//! Function to save posix_time::time_period objects using serialization lib
/*! time_period objects are broken down into 2 parts for serialization:
 * a begining ptime object and an ending ptime object
 */
template<class Archive>
void save(Archive & ar, 
          const posix_time::time_period& tp, 
          unsigned int /*version*/)
{
  posix_time::ptime beg(tp.begin().date(), tp.begin().time_of_day());
  posix_time::ptime end(tp.end().date(), tp.end().time_of_day());
  ar & make_nvp("time_period_begin", beg);
  ar & make_nvp("time_period_end", end);
}

//! Function to load posix_time::time_period objects using serialization lib
/*! time_period objects are broken down into 2 parts for serialization:
 * a begining ptime object and an ending ptime object
 */
template<class Archive>
void load(Archive & ar, 
          boost::posix_time::time_period & tp, 
          unsigned int /*version*/)
{
  posix_time::time_duration td(1,0,0);
  gregorian::date d(gregorian::not_a_date_time);
  posix_time::ptime beg(d,td);
  posix_time::ptime end(d,td);
  ar & make_nvp("time_period_begin", beg);
  ar & make_nvp("time_period_end", end);
  tp = boost::posix_time::time_period(beg, end);
}

//!override needed b/c no default constructor
template<class Archive>
inline void load_construct_data(Archive & ar, 
                                boost::posix_time::time_period* tp, 
                                const unsigned int /*file_version*/)
{
  posix_time::time_duration td(1,0,0);
  gregorian::date d(gregorian::not_a_date_time);
  posix_time::ptime beg(d,td);
  posix_time::ptime end(d,td);
  new(tp) boost::posix_time::time_period(beg,end);
}

} // namespace serialization
} // namespace boost

#endif