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# The MIT License (MIT)
# Copyright (c) 2017 Microsoft Corporation
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
"""Internal class for aggregation queries implementation in the Azure Cosmos database service.
"""
from abc import abstractmethod, ABCMeta
from azure.cosmos.execution_context.document_producer import _OrderByHelper
class _Aggregator(object):
__metaclass__ = ABCMeta
@abstractmethod
def aggregate(self, other):
pass
@abstractmethod
def get_result(self):
pass
class _AverageAggregator(_Aggregator):
def __init__(self):
self.sum = None
self.count = None
def aggregate(self, other):
if other is None or not 'sum' in other:
return
if self.sum is None:
self.sum = 0.0
self.count = 0
self.sum += other['sum']
self.count += other['count']
def get_result(self):
if self.sum is None or self.count is None or self.count <= 0:
return None
return self.sum / self.count
class _CountAggregator(_Aggregator):
def __init__(self):
self.count = 0
def aggregate(self, other):
self.count += other
def get_result(self):
return self.count
class _MinAggregator(_Aggregator):
def __init__(self):
self.value = None
def aggregate(self, other):
if self.value is None:
self.value = other
else:
if (_OrderByHelper.compare({'item': other}, {'item': self.value}) < 0):
self.value = other
def get_result(self):
return self.value
class _MaxAggregator(_Aggregator):
def __init__(self):
self.value = None
def aggregate(self, other):
if self.value is None:
self.value = other
else:
if (_OrderByHelper.compare({'item': other}, {'item': self.value}) > 0):
self.value = other
def get_result(self):
return self.value
class _SumAggregator(_Aggregator):
def __init__(self):
self.sum = None
def aggregate(self, other):
if other is None:
return
if self.sum is None:
self.sum = other
else:
self.sum += other
def get_result(self):
return self.sum
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