class Channel(BaseFile):
DataFileName = "data"
SegmentMaxLength = 512 * 60 * 3
"""Represents a session experiment of a subject in the sense of BIF.
Why use uniqueID instead of channel name as a ID reference?
Because in some experiments, the experimenter could have more than one data
over the same channel in the same session. So, to avoid create a new channel,
it would be better to assign a uniqueID reference. Obviously, this is an
akward situation. But, the file format need to be standard
"""
def __init__(self, metadata={}):
super(Channel, self).__init__(metadata)
self.session = None
self.data = None
def setData(self, data):
if self.data is None:
self.data = SegmentedData(self.SegmentMaxLength, self, self.pathname + [self.DataFileName])
self.data.set(data)
def getData(self, start=0, end=None):
if self.data is None:
self.data = SegmentedData(self.SegmentMaxLength, self, self.pathname + [self.DataFileName])
return self.data.get(start, end)
def write(self):
"""Write the content inside the archive provide."""
super(Channel, self).write()
self.writeMetadata()
def remove(self):
"""Removes the content inside the archive provide."""
super(Channel, self).remove()
self.writeMetadata()
def updateHash(self):
self.objectHash = self.data.objectHash
def defaultMetadataValues(self):
"""Fills the minimum neccesary metadata values."""
super(Subject, self).defaultMetadataValues()
self.metadata.setdefault("manufacturer", "?")
self.metadata.setdefault("label", "?")
self.metadata.setdefault("unit", "?")
self.metadata.setdefault("time-offset", 0)
self.metadata.setdefault("impedance", 0)
self.metadata.setdefault("sampling-rate", 0)
self.metadata.setdefault("filters", [])
@property
def archiver(self):
return self.session.archiver
@property
def pathname(self):
return self.session.pathname + ["CHANNEL-" + self.uniqueID]
def getData(self, start=0, end=None):
if self.data is None:
self.data = SegmentedData(self.SegmentMaxLength, self, self.pathname + [self.DataFileName])
return self.data.get(start, end)
def setData(self, data):
if self.data is None:
self.data = SegmentedData(self.SegmentMaxLength, self, self.pathname + [self.DataFileName])
self.data.set(data)
