forked from googleapis/python-spanner
/
data_types.py
56 lines (44 loc) · 1.65 KB
/
data_types.py
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# Copyright 2021 Google LLC
#
# Licensed 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.
"""Custom data types for spanner."""
import json
class JsonObject(dict):
"""
JsonObject type help format Django JSONField to compatible Cloud Spanner's
JSON type. Before making queries, it'll help differentiate between
normal parameters and JSON parameters.
"""
def __init__(self, *args, **kwargs):
self._is_null = (args, kwargs) == ((), {}) or args == (None,)
if not self._is_null:
super(JsonObject, self).__init__(*args, **kwargs)
@classmethod
def from_str(cls, str_repr):
"""Initiate an object from its `str` representation.
Args:
str_repr (str): JSON text representation.
Returns:
JsonObject: JSON object.
"""
if str_repr == "null":
return cls()
return cls(json.loads(str_repr))
def serialize(self):
"""Return the object text representation.
Returns:
str: JSON object text representation.
"""
if self._is_null:
return None
return json.dumps(self, sort_keys=True, separators=(",", ":"))