# Copyright 2020 Axis Communications AB.
#
# For a full list of individual contributors, please see the commit history.
#
# 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.
"""From datastructure."""
from .datastructure import DataStructure
# pylint:disable=too-few-public-methods
[docs]class From(DataStructure):
"""From datastructure.
Example::
{
"hello" {
"$from": {
"item": {
"value": "something",
"text": "world"
},
"get": "text"
}
}
}
# {"hello": "world"}
"""
[docs] def execute(self):
"""Execute the $from datastructure.
:return: Key and the value(s) found.
:rtype: tuple
"""
self.dataset.add("item", self.data.get("item"))
query = self.data.get("get")
if query is None:
return self.jsonkey, None
if not query.startswith("$item."):
query = "$item.{}".format(query)
_, value = self.dataset.lookup(query, {})
return None, value