File size: 3,966 Bytes
f9eec05 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | """Duration module."""
import functools
import operator
from matplotlib import _api
class Duration:
"""Class Duration in development."""
allowed = ["ET", "UTC"]
def __init__(self, frame, seconds):
"""
Create a new Duration object.
= ERROR CONDITIONS
- If the input frame is not in the allowed list, an error is thrown.
= INPUT VARIABLES
- frame The frame of the duration. Must be 'ET' or 'UTC'
- seconds The number of seconds in the Duration.
"""
_api.check_in_list(self.allowed, frame=frame)
self._frame = frame
self._seconds = seconds
def frame(self):
"""Return the frame the duration is in."""
return self._frame
def __abs__(self):
"""Return the absolute value of the duration."""
return Duration(self._frame, abs(self._seconds))
def __neg__(self):
"""Return the negative value of this Duration."""
return Duration(self._frame, -self._seconds)
def seconds(self):
"""Return the number of seconds in the Duration."""
return self._seconds
def __bool__(self):
return self._seconds != 0
def _cmp(self, op, rhs):
"""
Check that *self* and *rhs* share frames; compare them using *op*.
"""
self.checkSameFrame(rhs, "compare")
return op(self._seconds, rhs._seconds)
__eq__ = functools.partialmethod(_cmp, operator.eq)
__ne__ = functools.partialmethod(_cmp, operator.ne)
__lt__ = functools.partialmethod(_cmp, operator.lt)
__le__ = functools.partialmethod(_cmp, operator.le)
__gt__ = functools.partialmethod(_cmp, operator.gt)
__ge__ = functools.partialmethod(_cmp, operator.ge)
def __add__(self, rhs):
"""
Add two Durations.
= ERROR CONDITIONS
- If the input rhs is not in the same frame, an error is thrown.
= INPUT VARIABLES
- rhs The Duration to add.
= RETURN VALUE
- Returns the sum of ourselves and the input Duration.
"""
# Delay-load due to circular dependencies.
import matplotlib.testing.jpl_units as U
if isinstance(rhs, U.Epoch):
return rhs + self
self.checkSameFrame(rhs, "add")
return Duration(self._frame, self._seconds + rhs._seconds)
def __sub__(self, rhs):
"""
Subtract two Durations.
= ERROR CONDITIONS
- If the input rhs is not in the same frame, an error is thrown.
= INPUT VARIABLES
- rhs The Duration to subtract.
= RETURN VALUE
- Returns the difference of ourselves and the input Duration.
"""
self.checkSameFrame(rhs, "sub")
return Duration(self._frame, self._seconds - rhs._seconds)
def __mul__(self, rhs):
"""
Scale a UnitDbl by a value.
= INPUT VARIABLES
- rhs The scalar to multiply by.
= RETURN VALUE
- Returns the scaled Duration.
"""
return Duration(self._frame, self._seconds * float(rhs))
__rmul__ = __mul__
def __str__(self):
"""Print the Duration."""
return f"{self._seconds:g} {self._frame}"
def __repr__(self):
"""Print the Duration."""
return f"Duration('{self._frame}', {self._seconds:g})"
def checkSameFrame(self, rhs, func):
"""
Check to see if frames are the same.
= ERROR CONDITIONS
- If the frame of the rhs Duration is not the same as our frame,
an error is thrown.
= INPUT VARIABLES
- rhs The Duration to check for the same frame
- func The name of the function doing the check.
"""
if self._frame != rhs._frame:
raise ValueError(
f"Cannot {func} Durations with different frames.\n"
f"LHS: {self._frame}\n"
f"RHS: {rhs._frame}")
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