+ def _bt_can_seek_ns_from_origin_from_native(self, ns_from_origin):
+ # Return whether the iterator can seek ns from origin using the
+ # user-implemented seek_ns_from_origin method. We mimic the behavior
+ # of the C API:
+ #
+ # - If the iterator has a _user_can_seek_ns_from_origin method,
+ # call it and use its return value.
+ # - Otherwise, if there is a `_user_seek_ns_from_origin` method,
+ # we presume it's possible.
+
+ if hasattr(self, "_user_can_seek_ns_from_origin"):
+ can_seek_ns_from_origin = self._user_can_seek_ns_from_origin(ns_from_origin)
+ utils._check_bool(can_seek_ns_from_origin)
+ return can_seek_ns_from_origin
+ else:
+ return hasattr(self, "_user_seek_ns_from_origin")
+
+ def _bt_seek_ns_from_origin_from_native(self, ns_from_origin):
+ self._user_seek_ns_from_origin(ns_from_origin)
+
+ def _create_message_iterator(self, input_port):
+ utils._check_type(input_port, bt2_port._UserComponentInputPort)
+
+ if not input_port.is_connected:
+ raise ValueError("input port is not connected")
+
+ (
+ status,
+ msg_iter_ptr,
+ ) = native_bt.bt2_message_iterator_create_from_message_iterator(
+ self._bt_ptr, input_port._ptr
+ )
+ utils._handle_func_status(status, "cannot create message iterator object")
+ assert msg_iter_ptr is not None
+
+ return _UserComponentInputPortMessageIterator(msg_iter_ptr)
+
+ def _create_event_message(self, event_class, parent, default_clock_snapshot=None):
+ utils._check_type(event_class, bt2_event_class._EventClass)
+
+ if event_class.stream_class.supports_packets:
+ utils._check_type(parent, bt2_packet._Packet)
+ else:
+ utils._check_type(parent, bt2_stream._Stream)