def extract_data(self, timestamp, data, offset):
"""Extract the data from the feature's raw data.
Args:
timestamp (int): Data's timestamp.
data (str): The data read from the feature.
offset (int): Offset where to start reading data.
Returns:
:class:`blue_st_sdk.feature.ExtractedData`: Container of the number
of bytes read and the extracted data.
Raises:
:exc:`blue_st_sdk.utils.blue_st_exceptions.BlueSTInvalidDataException`
if the data array has not enough data to read.
"""
if len(data) - offset < self.DATA_LENGTH_BYTES:
raise BlueSTInvalidDataException(
'There is no %s byte available to read.' \
% (self.DATA_LENGTH_BYTES))
if len(data) - offset == self.DATA_LENGTH_BYTES:
# Extract the activity from the feature's raw data.
sample = Sample(
[NumberConversion.byte_to_uint8(data, offset),
datetime.now()], self.get_fields_description(), timestamp)
return ExtractedData(sample, self.DATA_LENGTH_BYTES)
else:
# Extract the activity and the algorithm from the feature's raw data.
sample = Sample([
NumberConversion.byte_to_uint8(data, offset),
datetime.now(),
NumberConversion.byte_to_uint8(data, offset + 1)
], self.get_fields_description(), timestamp)
return ExtractedData(sample, self.DATA_LENGTH_BYTES + 1)
def extract_data(self, timestamp, data, offset):
"""Extract the data from the feature's raw data.
Args:
timestamp (int): Data's timestamp.
data (str): The data read from the feature.
offset (int): Offset where to start reading data.
Returns:
:class:`blue_st_sdk.feature.ExtractedData`: Container of the number
of bytes read and the extracted data.
Raises:
:exc:`Exception` if the data array has not enough data to read.
"""
if len(data) - offset < self.DATA_LENGTH_BYTES:
raise Exception('There are no %d bytes available to read.' \
% (self.DATA_LENGTH_BYTES))
sample = Sample([NumberConversion.byteToUInt8(data, offset)],
self.get_fields_description(), timestamp)
return ExtractedData(sample, self.DATA_LENGTH_BYTES)