StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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120 lines
3.8 KiB
120 lines
3.8 KiB
# Copyright 2010-2015 MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tools for representing MongoDB internal Timestamps.
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"""
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import calendar
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import datetime
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from bson.py3compat import integer_types
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from bson.tz_util import utc
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UPPERBOUND = 4294967296
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class Timestamp(object):
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"""MongoDB internal timestamps used in the opLog.
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"""
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_type_marker = 17
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def __init__(self, time, inc):
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"""Create a new :class:`Timestamp`.
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This class is only for use with the MongoDB opLog. If you need
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to store a regular timestamp, please use a
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:class:`~datetime.datetime`.
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Raises :class:`TypeError` if `time` is not an instance of
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:class: `int` or :class:`~datetime.datetime`, or `inc` is not
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an instance of :class:`int`. Raises :class:`ValueError` if
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`time` or `inc` is not in [0, 2**32).
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:Parameters:
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- `time`: time in seconds since epoch UTC, or a naive UTC
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:class:`~datetime.datetime`, or an aware
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:class:`~datetime.datetime`
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- `inc`: the incrementing counter
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"""
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if isinstance(time, datetime.datetime):
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if time.utcoffset() is not None:
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time = time - time.utcoffset()
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time = int(calendar.timegm(time.timetuple()))
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if not isinstance(time, integer_types):
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raise TypeError("time must be an instance of int")
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if not isinstance(inc, integer_types):
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raise TypeError("inc must be an instance of int")
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if not 0 <= time < UPPERBOUND:
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raise ValueError("time must be contained in [0, 2**32)")
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if not 0 <= inc < UPPERBOUND:
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raise ValueError("inc must be contained in [0, 2**32)")
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self.__time = time
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self.__inc = inc
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@property
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def time(self):
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"""Get the time portion of this :class:`Timestamp`.
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"""
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return self.__time
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@property
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def inc(self):
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"""Get the inc portion of this :class:`Timestamp`.
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"""
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return self.__inc
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def __eq__(self, other):
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if isinstance(other, Timestamp):
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return (self.__time == other.time and self.__inc == other.inc)
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else:
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return NotImplemented
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def __hash__(self):
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return hash(self.time) ^ hash(self.inc)
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def __ne__(self, other):
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return not self == other
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def __lt__(self, other):
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if isinstance(other, Timestamp):
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return (self.time, self.inc) < (other.time, other.inc)
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return NotImplemented
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def __le__(self, other):
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if isinstance(other, Timestamp):
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return (self.time, self.inc) <= (other.time, other.inc)
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return NotImplemented
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def __gt__(self, other):
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if isinstance(other, Timestamp):
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return (self.time, self.inc) > (other.time, other.inc)
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return NotImplemented
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def __ge__(self, other):
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if isinstance(other, Timestamp):
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return (self.time, self.inc) >= (other.time, other.inc)
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return NotImplemented
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def __repr__(self):
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return "Timestamp(%s, %s)" % (self.__time, self.__inc)
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def as_datetime(self):
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"""Return a :class:`~datetime.datetime` instance corresponding
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to the time portion of this :class:`Timestamp`.
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The returned datetime's timezone is UTC.
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"""
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return datetime.datetime.fromtimestamp(self.__time, utc)
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