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import numpy as np
from .base import NumpyColumn
from ..util import get_inner_spec, get_inner_columns
class TupleColumn(NumpyColumn):
def __init__(self, nested_columns, **kwargs):
self.nested_columns = nested_columns
super(TupleColumn, self).__init__(**kwargs)
def write_data(self, items, buf):
names = items.dtype.names
for i, (x, name) in enumerate(zip(self.nested_columns, names)):
x.write_data(items[name], buf)
def write_items(self, items, buf):
return self.write_data(items, buf)
def read_data(self, n_items, buf):
data = [x.read_data(n_items, buf) for x in self.nested_columns]
dtype = [('f{}'.format(i), x.dtype) for i, x in enumerate(data)]
rv = np.empty(n_items, dtype=dtype)
for i, x in enumerate(data):
rv['f{}'.format(i)] = x
return rv
def read_items(self, n_items, buf):
return self.read_data(n_items, buf)
def create_tuple_column(spec, column_by_spec_getter, column_options):
inner_spec = get_inner_spec('Tuple', spec)
columns = get_inner_columns(inner_spec)
return TupleColumn([column_by_spec_getter(x) for x in columns],
**column_options)
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