How to use the statistics.FileStats.update function in statistics

be true if the files have been successfully updated (this is
		always false for un-changed files).

		"""
		if not changed or success:
			if source_rorp: self.statfileobj.add_source_file(source_rorp)
			if dest_rorp: self.statfileobj.add_dest_file(dest_rorp)
		if success == 0: metadata_rorp = dest_rorp
		elif success == 1 or success == 2:
			self.statfileobj.add_changed(source_rorp, dest_rorp)
			metadata_rorp = source_rorp
		else: metadata_rorp = None
		if metadata_rorp and metadata_rorp.lstat():
			metadata.WriteMetadata(metadata_rorp)
		if Globals.file_statistics:
			statistics.FileStats.update(source_rorp, dest_rorp, changed, inc)

if success == 0: metadata_rorp = dest_rorp
		elif success == 1: metadata_rorp = source_rorp
		else: metadata_rorp = None # in case deleted because of ListError
		if success == 1 or success == 2: 
			self.statfileobj.add_changed(source_rorp, dest_rorp)

		if metadata_rorp and metadata_rorp.lstat():
			metadata.MetadataFile.write_object(metadata_rorp)
			if Globals.eas_active and not metadata_rorp.get_ea().empty():
				eas_acls.ExtendedAttributesFile.write_object(
					metadata_rorp.get_ea())
			if Globals.acls_active and not metadata_rorp.get_acl().is_basic():
				eas_acls.AccessControlListFile.write_object(
					metadata_rorp.get_acl())
		if Globals.file_statistics:
			statistics.FileStats.update(source_rorp, dest_rorp, changed, inc)