64 lines
2.0 KiB
Python
64 lines
2.0 KiB
Python
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from .base import Column
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from .util import get_inner_spec, get_inner_columns_with_types
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class TupleColumn(Column):
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py_types = (list, tuple)
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def __init__(self, names, nested_columns, **kwargs):
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self.names = names
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self.nested_columns = nested_columns
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client_settings = kwargs['context'].client_settings
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settings = kwargs['context'].settings
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self.namedtuple_as_json = (
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settings.get('allow_experimental_object_type', False) and
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client_settings.get('namedtuple_as_json', True)
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)
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super(TupleColumn, self).__init__(**kwargs)
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self.null_value = tuple(x.null_value for x in nested_columns)
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def write_data(self, items, buf):
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items = self.prepare_items(items)
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items = list(zip(*items))
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for i, x in enumerate(self.nested_columns):
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x.write_data(list(items[i]), buf)
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def write_items(self, items, buf):
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return self.write_data(items, buf)
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def read_data(self, n_items, buf):
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rv = [x.read_data(n_items, buf) for x in self.nested_columns]
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rv = list(zip(*rv))
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if self.names[0] and self.namedtuple_as_json:
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return [dict(zip(self.names, x)) for x in rv]
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else:
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return rv
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def read_items(self, n_items, buf):
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return self.read_data(n_items, buf)
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def read_state_prefix(self, buf):
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super(TupleColumn, self).read_state_prefix(buf)
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for x in self.nested_columns:
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x.read_state_prefix(buf)
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def write_state_prefix(self, buf):
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super(TupleColumn, self).write_state_prefix(buf)
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for x in self.nested_columns:
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x.write_state_prefix(buf)
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def create_tuple_column(spec, column_by_spec_getter, column_options):
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inner_spec = get_inner_spec('Tuple', spec)
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columns_with_types = get_inner_columns_with_types(inner_spec)
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names, types = zip(*columns_with_types)
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return TupleColumn(names, [column_by_spec_getter(x) for x in types],
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**column_options)
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