| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| from ...utils.collections import deepcopy_with_locators |
| |
| |
| class Null(object): |
| """ |
| Represents an explicit null value provided by the user, which is different from |
| not supplying a value at all. |
| |
| It is a singleton. |
| """ |
| |
| @property |
| def as_raw(self): |
| return None |
| |
| NULL = Null() |
| |
| |
| def none_to_null(value): |
| """ |
| Convert ``None`` to ``NULL``, recursively. |
| """ |
| |
| if value is None: |
| return NULL |
| if isinstance(value, list): |
| value = deepcopy_with_locators(value) |
| for i, _ in enumerate(value): |
| value[i] = none_to_null(value[i]) |
| elif isinstance(value, dict): |
| value = deepcopy_with_locators(value) |
| for k, v in value.iteritems(): |
| value[k] = none_to_null(v) |
| return value |
| |
| |
| def null_to_none(value): |
| """ |
| Convert ``NULL`` to ``None``, recursively. |
| """ |
| |
| if value is NULL: |
| return None |
| if isinstance(value, list): |
| value = deepcopy_with_locators(value) |
| for i, _ in enumerate(value): |
| value[i] = none_to_null(value[i]) |
| elif isinstance(value, dict): |
| value = deepcopy_with_locators(value) |
| for k, v in value.iteritems(): |
| value[k] = none_to_null(v) |
| return value |