# SimQN: a discrete-event simulator for the quantum networks
# Copyright (C) 2021-2022 Lutong Chen, Jian Li, Kaiping Xue
# University of Science and Technology of China, USTC.
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
from typing import Union
default_accuracy = 1000000 # {default_accuracy} time slots per second
[docs]class Time(object):
def __init__(self, time_slot: int = 0, sec: float = 0.0, accuracy: int = default_accuracy):
'''
Time: the time slot used in the simulator
Args:
time_slot (int): the time slot
sec (float): the timestamp in second
accuracy: time slots per second
'''
self.accuracy = default_accuracy
if time_slot != 0:
self.time_slot = time_slot
else:
if sec is None:
sec = 0
self.time_slot = int(sec * self.accuracy)
@property
def sec(self) -> float:
'''
Returns:
the timestamp in second
'''
return self.time_slot / self.accuracy
def __eq__(self, other: object) -> bool:
return self.time_slot == other.time_slot
def __lt__(self, other: object) -> bool:
return self.time_slot < other.time_slot
def __le__(self, other: object) -> bool:
return self < other or self == other
def __gt__(self, other: object) -> bool:
return not (self < other or self == other)
def __ge__(self, other: object) -> bool:
return not (self < other)
def __ne__(self, other: object) -> bool:
return not self == other
def __add__(self, ts: Union["Time", float]) -> "Time":
"""
Add an offset to the Time object
Args:
ts (Union["Time", float]): a Time object or a float indicating time in second
"""
tn = Time(time_slot=self.time_slot, accuracy=self.accuracy)
if isinstance(ts, float):
ts = Time(sec=ts, accuracy=self.accuracy)
tn.time_slot += ts.time_slot
return tn
def __repr__(self) -> str:
return str(self.sec)