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+# Copyright (c) 2018 Cisco and/or its affiliates.
+# 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.
+
+"""Module holding BitCountingMetadataFactory class."""
+
+import math
+
+from AvgStdevMetadata import AvgStdevMetadata
+from AvgStdevMetadataFactory import AvgStdevMetadataFactory
+from BitCountingMetadata import BitCountingMetadata
+
+
+class BitCountingMetadataFactory(object):
+ """Class for factory which creates bit counting metadata from data.
+
+ TODO: Summarize the methods?
+ """
+
+ @staticmethod
+ def find_max_value(values):
+ """Return the max value.
+
+ This is a separate helper method,
+ because the whole set of values is usually larger than in from_data().
+
+ :param values: Run values to be processed.
+ :type values: Iterable of float
+ :returns: 0.0 or the biggest value found.
+ :rtype: float
+ """
+ max_value = 0.0
+ for value in values:
+ if isinstance(value, AvgStdevMetadata):
+ value = value.avg
+ if value > max_value:
+ max_value = value
+ return max_value
+
+ def __init__(self, max_value, prev_avg=None):
+ """Construct the factory instance with given arguments.
+
+ :param max_value: Maximal expected value.
+ :param prev_avg: Population average of the previous group.
+ If None, no previous average is taken into account.
+ If not None, the given previous average is used to discourage
+ consecutive groups with similar averages
+ (opposite triangle distribution is assumed).
+ :type max_value: float
+ :type prev_avg: float or None
+ """
+ self.max_value = max_value
+ self.prev_avg = prev_avg
+
+ def from_avg_stdev_metadata(self, metadata):
+ """Return new metadata object by adding bits to existing metadata.
+
+ :param metadata: Metadata to count bits for.
+ :type metadata: AvgStdevMetadata
+ :returns: The metadata with bits counted.
+ :rtype: BitCountingMetadata
+ """
+ return BitCountingMetadata(
+ max_value=self.max_value, size=metadata.size,
+ avg=metadata.avg, stdev=metadata.stdev, prev_avg=self.prev_avg)
+
+ def from_data(self, values):
+ """Return new metadata object fitting the values.
+
+ :param values: Run values to be processed.
+ :type values: Iterable of float or of AvgStdevMetadata
+ :returns: The metadata matching the values.
+ :rtype: BitCountingMetadata
+ """
+ metadata = AvgStdevMetadataFactory.from_data(values)
+ return self.from_avg_stdev_metadata(metadata)