Coverage for python/lsst/daf/butler/core/timespan.py : 41%

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1# This file is part of daf_butler.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (http://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <http://www.gnu.org/licenses/>.
21from __future__ import annotations
23__all__ = ("Timespan", "TIMESPAN_FIELD_SPECS")
25import operator
26from typing import Generic, Optional, TypeVar
28from sqlalchemy import DateTime
30from . import ddl
33T = TypeVar("T")
36class Timespan(Generic[T], tuple):
38 def __new__(cls, begin: T, end: T):
39 return tuple.__new__(cls, (begin, end))
41 def overlaps(self, other, ops=operator):
42 return ops.not_(ops.or_(self.end < other.begin, self.begin > other.end))
44 def intersection(*args) -> Optional[Timespan]:
45 if len(args) == 0:
46 return None
47 elif len(args) == 1:
48 return args[0]
49 else:
50 begin = max(*[ts.begin for ts in args])
51 end = min(*[ts.end for ts in args])
52 if begin > end:
53 return None
54 return Timespan(begin=begin, end=end)
56 @property
57 def begin(self) -> T:
58 return self[0]
60 @property
61 def end(self) -> T:
62 return self[1]
64 def __getnewargs__(self) -> tuple:
65 return (self.begin, self.end)
68TIMESPAN_FIELD_SPECS = Timespan(
69 begin=ddl.FieldSpec(name="datetime_begin", dtype=DateTime),
70 end=ddl.FieldSpec(name="datetime_end", dtype=DateTime),
71)