Hide keyboard shortcuts

Hot-keys on this page

r m x p   toggle line displays

j k   next/prev highlighted chunk

0   (zero) top of page

1   (one) first highlighted chunk

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 

22 

23__all__ = ("Timespan", "TIMESPAN_FIELD_SPECS", "TIMESPAN_MIN", "TIMESPAN_MAX") 

24 

25import operator 

26from typing import Generic, Optional, TypeVar 

27 

28from . import ddl, time_utils 

29 

30 

31TIMESPAN_MIN = time_utils.EPOCH 

32TIMESPAN_MAX = time_utils.MAX_TIME 

33 

34T = TypeVar("T") 

35 

36 

37class Timespan(Generic[T], tuple): 

38 

39 def __new__(cls, begin: T, end: T): 

40 return tuple.__new__(cls, (begin, end)) 

41 

42 def overlaps(self, other, ops=operator): 

43 return ops.not_(ops.or_(self.end < other.begin, self.begin > other.end)) 

44 

45 def intersection(*args) -> Optional[Timespan]: 

46 if len(args) == 0: 

47 return None 

48 elif len(args) == 1: 

49 return args[0] 

50 else: 

51 begin = max(*[ts.begin for ts in args]) 

52 end = min(*[ts.end for ts in args]) 

53 if begin > end: 

54 return None 

55 return Timespan(begin=begin, end=end) 

56 

57 @property 

58 def begin(self) -> T: 

59 return self[0] 

60 

61 @property 

62 def end(self) -> T: 

63 return self[1] 

64 

65 def __getnewargs__(self) -> tuple: 

66 return (self.begin, self.end) 

67 

68 

69# For timestamps we use Unix time in nanoseconds in TAI scale which need 

70# 64-bit integer, 

71TIMESPAN_FIELD_SPECS = Timespan( 

72 begin=ddl.FieldSpec(name="datetime_begin", dtype=ddl.AstropyTimeNsecTai), 

73 end=ddl.FieldSpec(name="datetime_end", dtype=ddl.AstropyTimeNsecTai), 

74)