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c7eee084 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 | ||
23 | from bt2 import native_bt, object, utils | |
24 | import bt2.component | |
25 | import bt2 | |
26 | ||
27 | ||
28 | class QueryExecutor(object._Object): | |
29 | def _handle_status(self, status, gen_error_msg): | |
30 | if status == native_bt.QUERY_STATUS_AGAIN: | |
31 | raise bt2.TryAgain | |
32 | elif status == native_bt.QUERY_STATUS_EXECUTOR_CANCELED: | |
33 | raise bt2.QueryExecutorCanceled | |
34 | elif status == native_bt.QUERY_STATUS_INVALID_OBJECT: | |
35 | raise bt2.InvalidQueryObject | |
36 | elif status == native_bt.QUERY_STATUS_INVALID_PARAMS: | |
37 | raise bt2.InvalidQueryParams | |
38 | elif status < 0: | |
39 | raise bt2.Error(gen_error_msg) | |
40 | ||
41 | def __init__(self): | |
42 | ptr = native_bt.query_executor_create() | |
43 | ||
44 | if ptr is None: | |
45 | raise bt2.CreationError('cannot create query executor object') | |
46 | ||
47 | super().__init__(ptr) | |
48 | ||
49 | def cancel(self): | |
50 | status = native_bt.query_executor_cancel(self._ptr) | |
51 | self._handle_status(status, 'cannot cancel query executor object') | |
52 | ||
53 | @property | |
54 | def is_canceled(self): | |
55 | is_canceled = native_bt.query_executor_is_canceled(self._ptr) | |
56 | assert(is_canceled >= 0) | |
57 | return is_canceled > 0 | |
58 | ||
59 | def query(self, component_class, object, params=None): | |
60 | if not isinstance(component_class, bt2.component._GenericComponentClass): | |
61 | err = False | |
62 | ||
63 | try: | |
64 | if not issubclass(component_class, bt2.component._UserComponent): | |
65 | err = True | |
66 | except TypeError: | |
67 | err = True | |
68 | ||
69 | if err: | |
70 | o = component_class | |
71 | raise TypeError("'{}' is not a component class object".format(o)) | |
72 | ||
73 | utils._check_str(object) | |
74 | ||
75 | if params is None: | |
76 | params_ptr = native_bt.value_null | |
77 | else: | |
78 | params = bt2.create_value(params) | |
79 | params_ptr = params._ptr | |
80 | ||
81 | if isinstance(component_class, bt2.component._GenericComponentClass): | |
82 | cc_ptr = component_class._ptr | |
83 | else: | |
84 | cc_ptr = component_class._cc_ptr | |
85 | ||
86 | status, result_ptr = native_bt.query_executor_query(self._ptr, cc_ptr, | |
87 | object, params_ptr) | |
88 | self._handle_status(status, 'cannot query component class') | |
89 | assert(result_ptr) | |
90 | return bt2.values._create_from_ptr(result_ptr) | |
91 | ||
92 | def __eq__(self, other): | |
93 | if type(other) is not type(self): | |
94 | return False | |
95 | ||
96 | return self.addr == other.addr |