def _build_criterion_expression(
self, operator_: str, left: Term,
right: Term) -> Union[BasicCriterion, Not, NullCriterion]:
if operator_ == "equals":
return left.eq(right)
elif operator_ == "not-equals":
return left.ne(right)
elif operator_ == 'empty':
return left.isnull()
elif operator_ == 'not-empty':
return left.notnull()
elif operator_ == "more":
return left.gt(right)
elif operator_ == "more-equals":
return left.gte(right)
elif operator_ == "less":
return left.lt(right)
elif operator_ == "less-equals":
return left.lte(right)
elif operator_ == 'in':
return left.isin(right)
elif operator_ == 'not-in':
return left.notin(right)
else:
# TODO more operator support
raise NotImplementedError("filter operator is not supported")
def not_equal(field: Term, value: Any) -> Criterion:
return field.ne(value) | field.isnull()