1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/update/pattern_cmp.h"
#include "mongo/db/bson/dotted_path_support.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/db/exec/document_value/value_comparator.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/jsobj.h"
namespace mongo {
namespace pattern_cmp {
Status checkSortClause(const BSONObj& sortObject) {
if (sortObject.isEmpty()) {
return Status(ErrorCodes::BadValue,
"The sort pattern is empty when it should be a set of fields.");
}
for (auto&& patternElement : sortObject) {
double orderVal = patternElement.isNumber() ? patternElement.Number() : 0;
if (orderVal != -1 && orderVal != 1) {
return Status(ErrorCodes::BadValue, "The sort element value must be either 1 or -1");
}
FieldRef sortField(patternElement.fieldName());
if (sortField.numParts() == 0) {
return Status(ErrorCodes::BadValue, "The sort field cannot be empty");
}
for (size_t i = 0; i < sortField.numParts(); ++i) {
if (sortField.getPart(i).size() == 0) {
return Status(ErrorCodes::BadValue,
str::stream() << "The sort field is a dotted field "
"but has an empty part: "
<< sortField.dottedField());
}
}
}
return Status::OK();
}
} // namespace pattern_cmp
PatternElementCmp::PatternElementCmp() = default;
PatternElementCmp::PatternElementCmp(const BSONObj& pattern, const CollatorInterface* collator)
: sortPattern(pattern.copy()), useWholeValue(sortPattern.hasField("")), collator(collator) {}
bool PatternElementCmp::operator()(const mutablebson::Element& lhs,
const mutablebson::Element& rhs) const {
namespace dps = ::mongo::dotted_path_support;
if (useWholeValue) {
const int comparedValue = lhs.compareWithElement(rhs, collator, false);
const bool reversed = (sortPattern.firstElement().number() < 0);
return (reversed ? comparedValue > 0 : comparedValue < 0);
} else {
BSONObj lhsObj = lhs.getType() == Object ? lhs.getValueObject() : lhs.getValue().wrap("");
BSONObj rhsObj = rhs.getType() == Object ? rhs.getValueObject() : rhs.getValue().wrap("");
BSONObj lhsKey = dps::extractElementsBasedOnTemplate(lhsObj, sortPattern, true);
BSONObj rhsKey = dps::extractElementsBasedOnTemplate(rhsObj, sortPattern, true);
return lhsKey.woCompare(rhsKey, sortPattern, false, collator) < 0;
}
}
PatternValueCmp::PatternValueCmp() = default;
PatternValueCmp::PatternValueCmp(const BSONObj& pattern,
const BSONElement& originalElement,
const CollatorInterface* collator)
: sortPattern(pattern.copy()),
useWholeValue(sortPattern.hasField("")),
originalObj(BSONObj().addField(originalElement).copy()),
collator(collator) {}
bool PatternValueCmp::operator()(const Value& lhs, const Value& rhs) const {
namespace dps = ::mongo::dotted_path_support;
if (useWholeValue) {
const bool descending = (sortPattern.firstElement().number() < 0);
return (descending ? ValueComparator(collator).getLessThan()(rhs, lhs)
: ValueComparator(collator).getLessThan()(lhs, rhs));
} else {
BSONObj lhsObj = lhs.isObject() ? lhs.getDocument().toBson() : lhs.wrap("");
BSONObj rhsObj = rhs.isObject() ? rhs.getDocument().toBson() : rhs.wrap("");
BSONObj lhsKey = dps::extractElementsBasedOnTemplate(lhsObj, sortPattern, true);
BSONObj rhsKey = dps::extractElementsBasedOnTemplate(rhsObj, sortPattern, true);
return lhsKey.woCompare(rhsKey, sortPattern, false, collator) < 0;
}
}
// Returns the original element passed into the PatternValueCmp constructor.
BSONElement PatternValueCmp::getOriginalElement() const {
return originalObj.firstElement();
}
} // namespace mongo
|
