Coverage for python/lsst/daf/butler/queries/_dimension_record_query_results.py: 49%

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1# This file is part of daf_butler. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This software is dual licensed under the GNU General Public License and also 

10# under a 3-clause BSD license. Recipients may choose which of these licenses 

11# to use; please see the files gpl-3.0.txt and/or bsd_license.txt, 

12# respectively. If you choose the GPL option then the following text applies 

13# (but note that there is still no warranty even if you opt for BSD instead): 

14# 

15# This program is free software: you can redistribute it and/or modify 

16# it under the terms of the GNU General Public License as published by 

17# the Free Software Foundation, either version 3 of the License, or 

18# (at your option) any later version. 

19# 

20# This program is distributed in the hope that it will be useful, 

21# but WITHOUT ANY WARRANTY; without even the implied warranty of 

22# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

23# GNU General Public License for more details. 

24# 

25# You should have received a copy of the GNU General Public License 

26# along with this program. If not, see <http://www.gnu.org/licenses/>. 

27 

28from __future__ import annotations 

29 

30__all__ = ("DimensionRecordQueryResults",) 

31 

32from collections.abc import Iterator 

33from typing import Any, final 

34 

35from ..dimensions import ( 

36 DimensionElement, 

37 DimensionGroup, 

38 DimensionRecord, 

39 DimensionRecordSet, 

40 DimensionRecordTable, 

41) 

42from ._base import QueryResultsBase 

43from .driver import QueryDriver 

44from .result_specs import DimensionRecordResultSpec 

45from .tree import QueryTree 

46 

47 

48@final 

49class DimensionRecordQueryResults(QueryResultsBase): 

50 """A query for `DimensionRecord` results. 

51 

52 Parameters 

53 ---------- 

54 driver : `QueryDriver` 

55 Implementation object that knows how to actually execute queries. 

56 tree : `QueryTree` 

57 Description of the query as a tree of joins and column expressions. 

58 The instance returned directly by the `Butler._query` entry point 

59 should be constructed via `make_unit_query_tree`. 

60 spec : `DimensionRecordResultSpec` 

61 Specification of the query result rows, including output columns, 

62 ordering, and slicing. 

63 

64 Notes 

65 ----- 

66 This class should never be constructed directly by users; use 

67 `Query.dimension_records` instead. 

68 """ 

69 

70 def __init__(self, driver: QueryDriver, tree: QueryTree, spec: DimensionRecordResultSpec): 

71 spec.validate_tree(tree) 

72 super().__init__(driver, tree) 

73 self._spec = spec 

74 

75 def __iter__(self) -> Iterator[DimensionRecord]: 

76 page = self._driver.execute(self._spec, self._tree) 

77 yield from page.rows 

78 while page.next_key is not None: 

79 page = self._driver.fetch_next_page(self._spec, page.next_key) 

80 yield from page.rows 

81 

82 def iter_table_pages(self) -> Iterator[DimensionRecordTable]: 

83 """Return an iterator over individual pages of results as table-backed 

84 collections. 

85 

86 Yields 

87 ------ 

88 table : `DimensionRecordTable` 

89 A table-backed collection of dimension records. 

90 """ 

91 page = self._driver.execute(self._spec, self._tree) 

92 yield page.as_table() 

93 while page.next_key is not None: 

94 page = self._driver.fetch_next_page(self._spec, page.next_key) 

95 yield page.as_table() 

96 

97 def iter_set_pages(self) -> Iterator[DimensionRecordSet]: 

98 """Return an iterator over individual pages of results as set-backed 

99 collections. 

100 

101 Yields 

102 ------ 

103 table : `DimensionRecordSet` 

104 A set-backed collection of dimension records. 

105 """ 

106 page = self._driver.execute(self._spec, self._tree) 

107 yield page.as_set() 

108 while page.next_key is not None: 

109 page = self._driver.fetch_next_page(self._spec, page.next_key) 

110 yield page.as_set() 

111 

112 @property 

113 def element(self) -> DimensionElement: 

114 # Docstring inherited. 

115 return self._spec.element 

116 

117 @property 

118 def dimensions(self) -> DimensionGroup: 

119 # Docstring inherited 

120 return self._spec.dimensions 

121 

122 def count(self, *, exact: bool = True, discard: bool = False) -> int: 

123 # Docstring inherited. 

124 return self._driver.count(self._tree, self._spec, exact=exact, discard=discard) 

125 

126 def _copy(self, tree: QueryTree, **kwargs: Any) -> DimensionRecordQueryResults: 

127 # Docstring inherited. 

128 return DimensionRecordQueryResults(self._driver, tree, self._spec.model_copy(update=kwargs)) 

129 

130 def _get_datasets(self) -> frozenset[str]: 

131 # Docstring inherited. 

132 return frozenset()