+# The MIT License (MIT)
+#
+# Copyright (c) 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
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from bt2 import native_bt, object, utils
+from bt2 import component as bt2_component
+import bt2
+
+
+def _is_source_comp_cls(comp_cls):
+ if isinstance(comp_cls, bt2_component._SourceComponentClass):
+ return True
+
+ try:
+ return issubclass(comp_cls, bt2_component._UserSourceComponent)
+ except:
+ return False
+
+
+def _is_filter_comp_cls(comp_cls):
+ if isinstance(comp_cls, bt2_component._FilterComponentClass):
+ return True
+
+ try:
+ return issubclass(comp_cls, bt2_component._UserFilterComponent)
+ except:
+ return False
+
+
+def _is_sink_comp_cls(comp_cls):
+ if isinstance(comp_cls, bt2_component._SinkComponentClass):
+ return True
+
+ try:
+ return issubclass(comp_cls, bt2_component._UserSinkComponent)
+ except:
+ return False
+
+
+class ComponentDescriptor:
+ def __init__(self, component_class, params=None, obj=None):
+ if (
+ not _is_source_comp_cls(component_class)
+ and not _is_filter_comp_cls(component_class)
+ and not _is_sink_comp_cls(component_class)
+ ):
+ raise TypeError(
+ "'{}' is not a component class".format(
+ component_class.__class__.__name__
+ )
+ )
+
+ base_cc_ptr = component_class._bt_component_class_ptr()
+
+ if obj is not None and not native_bt.bt2_is_python_component_class(base_cc_ptr):
+ raise ValueError('cannot pass a Python object to a non-Python component')
+
+ self._comp_cls = component_class
+ self._params = bt2.create_value(params)
+ self._obj = obj
+
+ @property
+ def component_class(self):
+ return self._comp_cls
+
+ @property
+ def params(self):
+ return self._params
+
+ @property
+ def obj(self):
+ return self._obj