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
|
/**
* Copyright (C) 2018-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/platform/basic.h"
#include "mongo/db/pipeline/document_source_replace_root.h"
#include <boost/smart_ptr/intrusive_ptr.hpp>
#include <fmt/format.h>
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/pipeline/document_source_replace_root_gen.h"
#include "mongo/db/pipeline/lite_parsed_document_source.h"
namespace mongo {
using boost::intrusive_ptr;
Document ReplaceRootTransformation::applyTransformation(const Document& input) {
// Extract subdocument in the form of a Value.
Value newRoot = _newRoot->evaluate(input, &_expCtx->variables);
// The newRoot expression, if it exists, must evaluate to an object.
uassert(40228,
fmt::format(kErrorTemplate.rawData(),
_errMsgContextForNonObject,
newRoot.toString(),
typeName(newRoot.getType()),
input.toString()),
newRoot.getType() == BSONType::Object);
// Turn the value into a document.
MutableDocument newDoc(newRoot.getDocument());
newDoc.copyMetaDataFrom(input);
return newDoc.freeze();
}
REGISTER_DOCUMENT_SOURCE(replaceRoot,
LiteParsedDocumentSourceDefault::parse,
DocumentSourceReplaceRoot::createFromBson,
AllowedWithApiStrict::kAlways);
REGISTER_DOCUMENT_SOURCE(replaceWith,
LiteParsedDocumentSourceDefault::parse,
DocumentSourceReplaceRoot::createFromBson,
AllowedWithApiStrict::kAlways);
intrusive_ptr<DocumentSource> DocumentSourceReplaceRoot::createFromBson(
BSONElement elem, const intrusive_ptr<ExpressionContext>& expCtx) {
const auto stageName = elem.fieldNameStringData();
auto newRootExpression = [&]() {
if (stageName == kAliasNameReplaceWith) {
return Expression::parseOperand(expCtx.get(), elem, expCtx->variablesParseState);
}
invariant(
stageName == kStageName,
str::stream() << "Unexpected stage registered with DocumentSourceReplaceRoot parser: "
<< stageName);
uassert(40229,
str::stream() << "expected an object as specification for " << kStageName
<< " stage, got " << typeName(elem.type()),
elem.type() == Object);
auto spec = ReplaceRootSpec::parse(IDLParserContext(kStageName), elem.embeddedObject());
// The IDL doesn't give us back the type we need to feed into the expression parser, and
// the expression parser needs the extra state in 'vps' and 'expCtx', so for now we have
// to adapt the two.
BSONObj parsingBson = BSON("newRoot" << spec.getNewRoot());
return Expression::parseOperand(
expCtx.get(), parsingBson.firstElement(), expCtx->variablesParseState);
}();
// Whether this was specified as $replaceWith or $replaceRoot, always use the name $replaceRoot
// to simplify the serialization process.
const bool isIndependentOfAnyCollection = false;
return new DocumentSourceSingleDocumentTransformation(
expCtx,
std::make_unique<ReplaceRootTransformation>(
expCtx,
newRootExpression,
(stageName == kStageName) ? "'newRoot' expression " : "'replacement document' "),
kStageName.rawData(),
isIndependentOfAnyCollection);
}
boost::intrusive_ptr<DocumentSource> DocumentSourceReplaceRoot::create(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const boost::intrusive_ptr<Expression>& newRootExpression,
std::string errMsgContextForNonObjects) {
const bool isIndependentOfAnyCollection = false;
return new DocumentSourceSingleDocumentTransformation(
expCtx,
std::make_unique<ReplaceRootTransformation>(
expCtx, newRootExpression, std::move(errMsgContextForNonObjects)),
kStageName.rawData(),
isIndependentOfAnyCollection);
}
} // namespace mongo
|
