src/bindings/python/bt2/bt2/field_path.py

   1 # SPDX-License-Identifier: MIT
   2 #
   3 # Copyright (c) 2018 Francis Deslauriers <francis.deslauriers@efficios.com>
   4
   5 import collections
   6 from bt2 import native_bt, object
   7
   8
   9 class FieldPathScope:
  10     PACKET_CONTEXT = native_bt.FIELD_PATH_SCOPE_PACKET_CONTEXT
  11     EVENT_COMMON_CONTEXT = native_bt.FIELD_PATH_SCOPE_EVENT_COMMON_CONTEXT
  12     EVENT_SPECIFIC_CONTEXT = native_bt.FIELD_PATH_SCOPE_EVENT_SPECIFIC_CONTEXT
  13     EVENT_PAYLOAD = native_bt.FIELD_PATH_SCOPE_EVENT_PAYLOAD
  14
  15
  16 class _FieldPathItem:
  17     pass
  18
  19
  20 class _IndexFieldPathItem(_FieldPathItem):
  21     def __init__(self, index):
  22         self._index = index
  23
  24     @property
  25     def index(self):
  26         return self._index
  27
  28
  29 class _CurrentArrayElementFieldPathItem(_FieldPathItem):
  30     pass
  31
  32
  33 class _CurrentOptionContentFieldPathItem(_FieldPathItem):
  34     pass
  35
  36
  37 class _FieldPathConst(object._SharedObject, collections.abc.Iterable):
  38     _get_ref = staticmethod(native_bt.field_path_get_ref)
  39     _put_ref = staticmethod(native_bt.field_path_put_ref)
  40
  41     @property
  42     def root_scope(self):
  43         scope = native_bt.field_path_get_root_scope(self._ptr)
  44         return _SCOPE_TO_OBJ[scope]
  45
  46     def __len__(self):
  47         return native_bt.field_path_get_item_count(self._ptr)
  48
  49     def __iter__(self):
  50         for idx in range(len(self)):
  51             item_ptr = native_bt.field_path_borrow_item_by_index_const(self._ptr, idx)
  52             assert item_ptr is not None
  53             item_type = native_bt.field_path_item_get_type(item_ptr)
  54             if item_type == native_bt.FIELD_PATH_ITEM_TYPE_INDEX:
  55                 idx = native_bt.field_path_item_index_get_index(item_ptr)
  56                 yield _IndexFieldPathItem(idx)
  57             elif item_type == native_bt.FIELD_PATH_ITEM_TYPE_CURRENT_ARRAY_ELEMENT:
  58                 yield _CurrentArrayElementFieldPathItem()
  59             elif item_type == native_bt.FIELD_PATH_ITEM_TYPE_CURRENT_OPTION_CONTENT:
  60                 yield _CurrentOptionContentFieldPathItem()
  61             else:
  62                 assert False
  63
  64
  65 _SCOPE_TO_OBJ = {
  66     native_bt.FIELD_PATH_SCOPE_PACKET_CONTEXT: FieldPathScope.PACKET_CONTEXT,
  67     native_bt.FIELD_PATH_SCOPE_EVENT_COMMON_CONTEXT: FieldPathScope.EVENT_COMMON_CONTEXT,
  68     native_bt.FIELD_PATH_SCOPE_EVENT_SPECIFIC_CONTEXT: FieldPathScope.EVENT_SPECIFIC_CONTEXT,
  69     native_bt.FIELD_PATH_SCOPE_EVENT_PAYLOAD: FieldPathScope.EVENT_PAYLOAD,
  70 }