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# 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
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