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from datetime import date, timedelta
from .base import FormatColumn
epoch_start = date(1970, 1, 1)
epoch_end = date(2149, 6, 6)
epoch_start_date32 = date(1925, 1, 1)
epoch_end_date32 = date(2283, 11, 11)
class DateColumn(FormatColumn):
ch_type = 'Date'
py_types = (date, )
format = 'H'
min_value = epoch_start
max_value = epoch_end
date_lut_days = (epoch_end - epoch_start).days + 1
date_lut = {x: epoch_start + timedelta(x) for x in range(date_lut_days)}
date_lut_reverse = {value: key for key, value in date_lut.items()}
def before_write_items(self, items, nulls_map=None):
null_value = self.null_value
date_lut_reverse = self.date_lut_reverse
min_value = self.min_value
max_value = self.max_value
for i, item in enumerate(items):
if nulls_map and nulls_map[i]:
items[i] = null_value
continue
if type(item) != date:
item = date(item.year, item.month, item.day)
if min_value <= item <= max_value:
items[i] = date_lut_reverse[item]
else:
items[i] = 0
def after_read_items(self, items, nulls_map=None):
date_lut = self.date_lut
if nulls_map is None:
return tuple(date_lut[item] for item in items)
else:
return tuple(
(None if is_null else date_lut[items[i]])
for i, is_null in enumerate(nulls_map)
)
class Date32Column(DateColumn):
ch_type = 'Date32'
format = 'i'
min_value = epoch_start_date32
max_value = epoch_end_date32
date_lut_days = (epoch_end_date32 - epoch_start).days + 1
date_lut = {
x: epoch_start + timedelta(x)
for x in range((epoch_start_date32 - epoch_start).days, date_lut_days)
}
date_lut_reverse = {value: key for key, value in date_lut.items()}
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