lib: make can_seek_ns_from_origin logic use `can_seek_forward` property of iterator

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

diff --git a/src/bindings/python/bt2/bt2/message_iterator.py b/src/bindings/python/bt2/bt2/message_iterator.py
index 3a3a2a430681608688e68d2f79921ae63c03f398..253fbcc73c4c9cdd63488fd381dc2fc671274e3f 100644 (file)
--- a/src/bindings/python/bt2/bt2/message_iterator.py
+++ b/src/bindings/python/bt2/bt2/message_iterator.py
@@ -85,6 +85,50 @@ class _UserComponentInputPortMessageIterator(object._SharedObject, _MessageItera
         )
         utils._handle_func_status(status, 'cannot seek message iterator beginning')
 
+    def can_seek_ns_from_origin(self, ns_from_origin):
+        utils._check_int64(ns_from_origin)
+        status, res = native_bt.self_component_port_input_message_iterator_can_seek_ns_from_origin(
+            self._ptr, ns_from_origin
+        )
+        utils._handle_func_status(
+            status,
+            'cannot check whether or not message iterator can seek given ns from origin',
+        )
+        return res != 0
+
+    def seek_ns_from_origin(self, ns_from_origin):
+        utils._check_int64(ns_from_origin)
+
+        # Forget about buffered messages, they won't be valid after seeking.
+        self._current_msgs.clear()
+        self._at = 0
+
+        status = native_bt.self_component_port_input_message_iterator_seek_ns_from_origin(
+            self._ptr, ns_from_origin
+        )
+        utils._handle_func_status(
+            status, 'message iterator cannot seek given ns from origin'
+        )
+
+    @property
+    def can_seek_forward(self):
+        return native_bt.self_component_port_input_message_iterator_can_seek_forward(
+            self._ptr
+        )
+
+
+class _MessageIteratorConfiguration:
+    def __init__(self, ptr):
+        self._ptr = ptr
+
+    def can_seek_forward(self, value):
+        utils._check_bool(value)
+        native_bt.self_message_iterator_configuration_set_can_seek_forward(
+            self._ptr, value
+        )
+
+    can_seek_forward = property(fset=can_seek_forward)
+
 
 # This is extended by the user to implement component classes in Python.  It
 # is created for a given output port when an input port message iterator is
@@ -109,13 +153,14 @@ class _UserMessageIterator(_MessageIterator):
         self._bt_ptr = ptr
         return self
 
-    def _bt_init_from_native(self, self_output_port_ptr):
+    def _bt_init_from_native(self, config_ptr, self_output_port_ptr):
         self_output_port = bt2_port._create_self_from_ptr_and_get_ref(
             self_output_port_ptr, native_bt.PORT_TYPE_OUTPUT
         )
-        self.__init__(self_output_port)
+        config = _MessageIteratorConfiguration(config_ptr)
+        self.__init__(config, self_output_port)
 
-    def __init__(self, output_port):
+    def __init__(self, config, self_output_port):
         pass
 
     @property
@@ -178,6 +223,26 @@ class _UserMessageIterator(_MessageIterator):
     def _bt_seek_beginning_from_native(self):
         self._user_seek_beginning()
 
+    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_input_port_message_iterator(self, input_port):
         utils._check_type(input_port, bt2_port._UserComponentInputPort)