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f865c2aa PP |
1 | # The MIT License (MIT) |
2 | # | |
3 | # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> | |
4 | # | |
5 | # Permission is hereby granted, free of charge, to any person obtaining a copy | |
6 | # of this software and associated documentation files (the "Software"), to deal | |
7 | # in the Software without restriction, including without limitation the rights | |
8 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
9 | # copies of the Software, and to permit persons to whom the Software is | |
10 | # furnished to do so, subject to the following conditions: | |
11 | # | |
12 | # The above copyright notice and this permission notice shall be included in | |
13 | # all copies or substantial portions of the Software. | |
14 | # | |
15 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
18 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
21 | # THE SOFTWARE. | |
22 | ||
6a4dbecc | 23 | from bt2 import native_bt |
f865c2aa PP |
24 | from bt2 import component as bt2_component |
25 | import bt2 | |
26 | ||
27 | ||
28 | def _is_source_comp_cls(comp_cls): | |
29 | if isinstance(comp_cls, bt2_component._SourceComponentClass): | |
30 | return True | |
31 | ||
32 | try: | |
33 | return issubclass(comp_cls, bt2_component._UserSourceComponent) | |
4c4935bf | 34 | except Exception: |
f865c2aa PP |
35 | return False |
36 | ||
37 | ||
38 | def _is_filter_comp_cls(comp_cls): | |
39 | if isinstance(comp_cls, bt2_component._FilterComponentClass): | |
40 | return True | |
41 | ||
42 | try: | |
43 | return issubclass(comp_cls, bt2_component._UserFilterComponent) | |
4c4935bf | 44 | except Exception: |
f865c2aa PP |
45 | return False |
46 | ||
47 | ||
48 | def _is_sink_comp_cls(comp_cls): | |
49 | if isinstance(comp_cls, bt2_component._SinkComponentClass): | |
50 | return True | |
51 | ||
52 | try: | |
53 | return issubclass(comp_cls, bt2_component._UserSinkComponent) | |
4c4935bf | 54 | except Exception: |
f865c2aa PP |
55 | return False |
56 | ||
57 | ||
58 | class ComponentDescriptor: | |
59 | def __init__(self, component_class, params=None, obj=None): | |
60 | if ( | |
61 | not _is_source_comp_cls(component_class) | |
62 | and not _is_filter_comp_cls(component_class) | |
63 | and not _is_sink_comp_cls(component_class) | |
64 | ): | |
65 | raise TypeError( | |
66 | "'{}' is not a component class".format( | |
67 | component_class.__class__.__name__ | |
68 | ) | |
69 | ) | |
70 | ||
71 | base_cc_ptr = component_class._bt_component_class_ptr() | |
72 | ||
73 | if obj is not None and not native_bt.bt2_is_python_component_class(base_cc_ptr): | |
74 | raise ValueError('cannot pass a Python object to a non-Python component') | |
75 | ||
76 | self._comp_cls = component_class | |
77 | self._params = bt2.create_value(params) | |
78 | self._obj = obj | |
79 | ||
80 | @property | |
81 | def component_class(self): | |
82 | return self._comp_cls | |
83 | ||
84 | @property | |
85 | def params(self): | |
86 | return self._params | |
87 | ||
88 | @property | |
89 | def obj(self): | |
90 | return self._obj |