Duration.py
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"""Duration module."""
import operator
from matplotlib import cbook
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.
"""
cbook._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 __eq__(self, rhs):
return self._cmp(rhs, operator.eq)
def __ne__(self, rhs):
return self._cmp(rhs, operator.ne)
def __lt__(self, rhs):
return self._cmp(rhs, operator.lt)
def __le__(self, rhs):
return self._cmp(rhs, operator.le)
def __gt__(self, rhs):
return self._cmp(rhs, operator.gt)
def __ge__(self, rhs):
return self._cmp(rhs, operator.ge)
def _cmp(self, rhs, op):
"""
Compare two Durations.
= INPUT VARIABLES
- rhs The Duration to compare against.
- op The function to do the comparison
= RETURN VALUE
- Returns op(self, rhs)
"""
self.checkSameFrame(rhs, "compare")
return op(self._seconds, rhs._seconds)
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))
def __rmul__(self, lhs):
"""
Scale a Duration by a value.
= INPUT VARIABLES
- lhs The scalar to multiply by.
= RETURN VALUE
- Returns the scaled Duration.
"""
return Duration(self._frame, self._seconds * float(lhs))
def __str__(self):
"""Print the Duration."""
return "%g %s" % (self._seconds, self._frame)
def __repr__(self):
"""Print the Duration."""
return "Duration('%s', %g)" % (self._frame, self._seconds)
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}")