def _read(cls, h5_group, memo) -> "TimeField":
"""Read a TimeField from a HDF5 data source"""
name = h5_group.attrs["fieldname"]
if name in memo:
time = memo[name]
else:
time = TimeArray._read(h5_group, memo)
return cls(num_obs=len(time), name=name.split(".")[-1], val=time)
def _extend(self, other_field, memo) -> None:
"""Add observations from another field"""
if other_field.data.ndim != self.data.ndim:
raise ValueError(
f"Field '{self.name}' cannot be extended. Dimensions must be equal. ({other_field.data.ndim} != {self.data.ndim})"
)
self.data = TimeArray.insert(self.data, self.num_obs, other_field.data,
memo)
def _append_empty(self, num_obs, memo):
# Use datetime.min as "empty" value
empty = Time([datetime.min] * num_obs, scale="utc", fmt="datetime")
empty_id = id(empty)
self.data = TimeArray.insert(self.data, self.num_obs, empty, memo)
memo.pop(empty_id, None)