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/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
libdcp is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libdcp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libdcp. If not, see <http://www.gnu.org/licenses/>.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations
including the two.
You must obey the GNU General Public License in all respects
for all of the code used other than OpenSSL. If you modify
file(s) with this exception, you may extend this exception to your
version of the file(s), but you are not obligated to do so. If you
do not wish to do so, delete this exception statement from your
version. If you delete this exception statement from all source
files in the program, then also delete it here.
*/
/** @file src/local_time.cc
* @brief LocalTime class.
*/
#include "local_time.h"
#include "exceptions.h"
#include "dcp_assert.h"
#include <boost/lexical_cast.hpp>
#include <boost/date_time/c_local_time_adjustor.hpp>
#include <cstdio>
using std::string;
using std::ostream;
using boost::lexical_cast;
using namespace dcp;
/** Construct a LocalTime from the current time */
LocalTime::LocalTime ()
{
time_t now = time (0);
struct tm* tm = localtime (&now);
_year = tm->tm_year + 1900;
_month = tm->tm_mon + 1;
_day = tm->tm_mday;
_hour = tm->tm_hour;
_minute = tm->tm_min;
_second = tm->tm_sec;
_millisecond = 0;
set_local_time_zone ();
}
/** Construct a LocalTime from a boost::posix_time::ptime using the local
* time zone.
*/
LocalTime::LocalTime (boost::posix_time::ptime t)
{
_year = t.date().year ();
_month = t.date().month ();
_day = t.date().day ();
_hour = t.time_of_day().hours ();
_minute = t.time_of_day().minutes ();
_second = t.time_of_day().seconds ();
_millisecond = t.time_of_day().fractional_seconds () / 1000;
DCP_ASSERT (_millisecond < 1000);
set_local_time_zone ();
}
/** Construct a LocalTime from a boost::posix_time::ptime and a time zone offset */
LocalTime::LocalTime (boost::posix_time::ptime t, int tz_hour, int tz_minute)
{
_year = t.date().year ();
_month = t.date().month ();
_day = t.date().day ();
_hour = t.time_of_day().hours ();
_minute = t.time_of_day().minutes ();
_second = t.time_of_day().seconds ();
_millisecond = t.time_of_day().fractional_seconds () / 1000;
DCP_ASSERT (_millisecond < 1000);
_tz_hour = tz_hour;
_tz_minute = tz_minute;
}
/** Set our UTC offset to be according to the local time zone */
void
LocalTime::set_local_time_zone ()
{
boost::posix_time::ptime const utc_now = boost::posix_time::second_clock::universal_time ();
boost::posix_time::ptime const now = boost::date_time::c_local_adjustor<boost::posix_time::ptime>::utc_to_local (utc_now);
boost::posix_time::time_duration offset = now - utc_now;
_tz_hour = offset.hours ();
_tz_minute = offset.minutes ();
}
/** @param s A string of the form 2013-01-05T18:06:59[.123]+04:00 */
LocalTime::LocalTime (string s)
{
/* 2013-01-05T18:06:59+04:00 or 2013-01-05T18:06:59.123+04:00 */
/* 0123456789012345678901234 or 01234567890123456789012345678 */
if (s.length() < 25) {
throw TimeFormatError (s);
}
/* Check incidental characters */
bool const common = s[4] == '-' && s[7] == '-' && s[10] == 'T' && s[13] == ':' && s[16] == ':';
bool const without_millisecond = common && s[22] == ':';
bool const with_millisecond = common && s[19] == '.' && s[26] == ':';
if (!with_millisecond && !without_millisecond) {
throw TimeFormatError (s);
}
_year = lexical_cast<int> (s.substr (0, 4));
_month = lexical_cast<int> (s.substr (5, 2));
_day = lexical_cast<int> (s.substr (8, 2));
_hour = lexical_cast<int> (s.substr (11, 2));
_minute = lexical_cast<int> (s.substr (14, 2));
_second = lexical_cast<int> (s.substr (17, 2));
if (without_millisecond) {
_millisecond = 0;
_tz_hour = lexical_cast<int> (s.substr (20, 2));
_tz_minute = lexical_cast<int> (s.substr (23, 2));
} else {
_millisecond = lexical_cast<int> (s.substr (20, 3));
_tz_hour = lexical_cast<int> (s.substr (24, 2));
_tz_minute = lexical_cast<int> (s.substr (27, 2));
}
int const plus_minus_position = with_millisecond ? 23 : 19;
if (s[plus_minus_position] == '-') {
_tz_hour = -_tz_hour;
} else if (s[plus_minus_position] != '+') {
throw TimeFormatError (s);
}
}
/** @return A string of the form 2013-01-05T18:06:59+04:00 or 2013-01-05T18:06:59.123+04:00 */
string
LocalTime::as_string (bool with_millisecond) const
{
char buffer[32];
snprintf (
buffer, sizeof (buffer),
"%sT%s%s%02d:%02d",
date().c_str(), time_of_day(with_millisecond).c_str(), (_tz_hour >= 0 ? "+" : "-"), abs (_tz_hour), _tz_minute
);
return buffer;
}
/** @return The date in the form YYYY-MM-DD */
string
LocalTime::date () const
{
char buffer[32];
snprintf (buffer, sizeof (buffer), "%04d-%02d-%02d", _year, _month, _day);
return buffer;
}
/** @return The time in the form HH:MM:SS or HH:MM:SS.mmm */
string
LocalTime::time_of_day (bool with_millisecond) const
{
char buffer[32];
if (with_millisecond) {
snprintf (buffer, sizeof (buffer), "%02d:%02d:%02d.%03d", _hour, _minute, _second, _millisecond);
} else {
snprintf (buffer, sizeof (buffer), "%02d:%02d:%02d", _hour, _minute, _second);
}
return buffer;
}
bool
LocalTime::operator== (LocalTime const & other) const
{
return _year == other._year && _month == other._month && _day == other._day &&
_hour == other._hour && _second == other._second && _millisecond == other._millisecond &&
_tz_hour == other._tz_hour && _tz_minute == other._tz_minute;
}
bool
LocalTime::operator!= (LocalTime const & other) const
{
return !(*this == other);
}
ostream&
dcp::operator<< (ostream& s, LocalTime const & t)
{
s << t.as_string ();
return s;
}
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