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
|
/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/platform/basic.h"
#include "mongo/db/update/unset_node.h"
#include "mongo/db/update/storage_validation.h"
namespace mongo {
Status UnsetNode::init(BSONElement modExpr, const boost::intrusive_ptr<ExpressionContext>& expCtx) {
// Note that we don't need to store modExpr, because $unset does not do anything with its value.
invariant(modExpr.ok());
return Status::OK();
}
ModifierNode::ModifyResult UnsetNode::updateExistingElement(
mutablebson::Element* element, std::shared_ptr<FieldRef> elementPath) const {
auto parent = element->parent();
invariant(parent.ok());
if (!parent.isType(BSONType::Array)) {
invariant(element->remove());
} else {
// Special case: An $unset on an array element sets it to null instead of removing it from
// the array.
invariant(element->setValueNull());
}
return ModifyResult::kNormalUpdate;
}
void UnsetNode::validateUpdate(mutablebson::ConstElement updatedElement,
mutablebson::ConstElement leftSibling,
mutablebson::ConstElement rightSibling,
std::uint32_t recursionLevel,
ModifyResult modifyResult) const {
invariant(modifyResult == ModifyResult::kNormalUpdate);
// We only need to check the left and right sibling to see if the removed element was part of a
// now invalid DBRef.
const bool doRecursiveCheck = false;
const uint32_t recursionLevelForCheck = 0;
if (leftSibling.ok()) {
storage_validation::storageValid(leftSibling, doRecursiveCheck, recursionLevelForCheck);
}
if (rightSibling.ok()) {
storage_validation::storageValid(rightSibling, doRecursiveCheck, recursionLevelForCheck);
}
}
void UnsetNode::logUpdate(LogBuilder* logBuilder,
StringData pathTaken,
mutablebson::Element element,
ModifyResult modifyResult) const {
invariant(logBuilder);
invariant(modifyResult == ModifyResult::kNormalUpdate);
uassertStatusOK(logBuilder->addToUnsets(pathTaken));
}
} // namespace mongo
|
