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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 | ||
78288f58 | 28 | class QueryExecutor(object._SharedObject): |
2f16a6a2 PP |
29 | _get_ref = staticmethod(native_bt.query_executor_get_ref) |
30 | _put_ref = staticmethod(native_bt.query_executor_put_ref) | |
601c0026 | 31 | |
c7eee084 | 32 | def _handle_status(self, status, gen_error_msg): |
601c0026 | 33 | if status == native_bt.QUERY_EXECUTOR_STATUS_AGAIN: |
c7eee084 | 34 | raise bt2.TryAgain |
601c0026 | 35 | elif status == native_bt.QUERY_EXECUTOR_STATUS_CANCELED: |
c7eee084 | 36 | raise bt2.QueryExecutorCanceled |
601c0026 | 37 | elif status == native_bt.QUERY_EXECUTOR_STATUS_INVALID_OBJECT: |
c7eee084 | 38 | raise bt2.InvalidQueryObject |
601c0026 | 39 | elif status == native_bt.QUERY_EXECUTOR_STATUS_INVALID_PARAMS: |
c7eee084 PP |
40 | raise bt2.InvalidQueryParams |
41 | elif status < 0: | |
42 | raise bt2.Error(gen_error_msg) | |
43 | ||
44 | def __init__(self): | |
45 | ptr = native_bt.query_executor_create() | |
46 | ||
47 | if ptr is None: | |
48 | raise bt2.CreationError('cannot create query executor object') | |
49 | ||
50 | super().__init__(ptr) | |
51 | ||
52 | def cancel(self): | |
53 | status = native_bt.query_executor_cancel(self._ptr) | |
54 | self._handle_status(status, 'cannot cancel query executor object') | |
55 | ||
56 | @property | |
57 | def is_canceled(self): | |
58 | is_canceled = native_bt.query_executor_is_canceled(self._ptr) | |
59 | assert(is_canceled >= 0) | |
60 | return is_canceled > 0 | |
61 | ||
62 | def query(self, component_class, object, params=None): | |
1d765120 SM |
63 | if self.is_canceled: |
64 | raise bt2.QueryExecutorCanceled | |
65 | ||
c7eee084 PP |
66 | if not isinstance(component_class, bt2.component._GenericComponentClass): |
67 | err = False | |
68 | ||
69 | try: | |
70 | if not issubclass(component_class, bt2.component._UserComponent): | |
71 | err = True | |
72 | except TypeError: | |
73 | err = True | |
74 | ||
75 | if err: | |
76 | o = component_class | |
77 | raise TypeError("'{}' is not a component class object".format(o)) | |
78 | ||
79 | utils._check_str(object) | |
80 | ||
81 | if params is None: | |
82 | params_ptr = native_bt.value_null | |
83 | else: | |
84 | params = bt2.create_value(params) | |
85 | params_ptr = params._ptr | |
86 | ||
601c0026 | 87 | cc_ptr = component_class._component_class_ptr() |
c7eee084 PP |
88 | |
89 | status, result_ptr = native_bt.query_executor_query(self._ptr, cc_ptr, | |
90 | object, params_ptr) | |
91 | self._handle_status(status, 'cannot query component class') | |
92 | assert(result_ptr) | |
c4239792 | 93 | return bt2.value._create_from_ptr(result_ptr) |