bt2: stream.py: add `trace` property to _Stream

[babeltrace.git] / src / bindings / python / bt2 / bt2 / stream.py

# The MIT License (MIT)
#
# Copyright (c) 2016-2017 Philippe Proulx <pproulx@efficios.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.

from bt2 import native_bt, utils
from bt2 import object as bt2_object
from bt2 import packet as bt2_packet
from bt2 import event as bt2_event
from bt2 import trace as bt2_trace
from bt2 import stream_class as bt2_stream_class
import bt2


class _Stream(bt2_object._SharedObject):
    _get_ref = staticmethod(native_bt.stream_get_ref)
    _put_ref = staticmethod(native_bt.stream_put_ref)

    @property
    def cls(self):
        stream_class_ptr = native_bt.stream_borrow_class(self._ptr)
        assert stream_class_ptr is not None
        return bt2_stream_class._StreamClass._create_from_ptr_and_get_ref(
            stream_class_ptr
        )

    @property
    def name(self):
        return native_bt.stream_get_name(self._ptr)

    def _name(self, name):
        utils._check_str(name)
        native_bt.stream_set_name(self._ptr, name)

    _name = property(fset=_name)

    @property
    def id(self):
        id = native_bt.stream_get_id(self._ptr)
        return id if id >= 0 else None

    def create_packet(self):
        if not self.cls.supports_packets:
            raise ValueError(
                'cannot create packet: stream class does not support packets'
            )

        packet_ptr = native_bt.packet_create(self._ptr)

        if packet_ptr is None:
            raise bt2._MemoryError('cannot create packet object')

        return bt2_packet._Packet._create_from_ptr(packet_ptr)

    @property
    def trace(self):
        trace_ptr = native_bt.stream_borrow_trace(self._ptr)
        assert trace_ptr is not None
        return bt2_trace._Trace._create_from_ptr_and_get_ref(trace_ptr)