import datetime

class FitFileDataProcessor(object):

# TODO: Document API

#def process_type_<type_name> (field_data)

#def process_field_<field_name> (field_data) -- can be unknown_DD but NOT recommended

#def process_message_<mesg_name / mesg_type_num> (data_message)

def process_type_bool(self, field_data):

if field_data.value is not None:

field_data.value = bool(field_data.value)

def process_type_date_time(self, field_data):

value = field_data.value

if value is not None and value >= 0x10000000:

field_data.value = datetime.datetime.utcfromtimestamp(631065600 + value)

field_data.units = None # Units were 's', set to None

def process_type_local_date_time(self, field_data):

if field_data.value is not None:

field_data.value = datetime.datetime.fromtimestamp(631065600 + field_data.value)

field_data.units = None

class StandardUnitsDataProcessor(FitFileDataProcessor):

# Example use case

def process_field_distance(self, field_data):

if field_data.value is not None:

field_data.value /= 1000.0

field_data.units = 'km'

def process_field_speed(self, field_data):

if field_data.value is not None:

field_data.value *= 60.0 * 60.0 / 1000.0

field_data.units = 'km/h'

def process_units_semicircles(self, field_data):

if field_data.value is not None:

field_data.value *= 180.0 / (2 ** 31)

field_data.units = 'deg'