def __init__(self, Table, **config):
'''Private constructor for a View object - use the Table.view() method to create Views.
A View object represents a specific transform (configuration or pivot,
filter, sort, etc) configuration on an underlying Table. A View
receives all updates from the Table from which it is derived, and
can be serialized to JSON or trigger a callback when it is updated.
View objects are immutable, and will remain in memory and actively process
updates until its delete() method is called.
'''
self._name = "py_" + str(random())
self._table = Table
self._config = ViewConfig(**config)
self._sides = self.sides()
date_validator = self._table._accessor._date_validator
if self._sides == 0:
self._view = make_view_zero(self._table._table, self._name,
COLUMN_SEPARATOR_STRING, self._config,
date_validator)
elif self._sides == 1:
self._view = make_view_one(self._table._table, self._name,
COLUMN_SEPARATOR_STRING, self._config,
date_validator)
else:
self._view = make_view_two(self._table._table, self._name,
COLUMN_SEPARATOR_STRING, self._config,
date_validator)
self._column_only = self._view.is_column_only()
self._callbacks = self._table._callbacks
self._delete_callbacks = _PerspectiveCallBackCache()
def test_make_view_zero(self):
accessor = _PerspectiveAccessor([{"a": 1, "b": 2}, {"a": 3, "b": 4}])
view_config = ViewConfig({})
tbl = make_table(None, accessor, None, 4294967295, '', t_op.OP_INSERT,
False, False)
view = make_view_zero(tbl, "view0", "|", view_config,
accessor._date_validator)
assert view.num_rows() == 2