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
|
/**
* Copyright (c) 2011 10gen 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/>.
*/
#include "pch.h"
#include "db/pipeline/field_path.h"
#include "util/mongoutils/str.h"
namespace mongo {
using namespace mongoutils;
FieldPath::~FieldPath() {
}
FieldPath::FieldPath():
vFieldName() {
}
FieldPath::FieldPath(const string &fieldPath):
vFieldName() {
/*
The field path could be using dot notation.
Break the field path up by peeling off successive pieces.
*/
size_t startpos = 0;
while(true) {
/* find the next dot */
const size_t dotpos = fieldPath.find('.', startpos);
/* if there are no more dots, use the remainder of the string */
if (dotpos == fieldPath.npos) {
vFieldName.push_back(fieldPath.substr(startpos, dotpos));
break;
}
/* use the string up to the dot */
const size_t length = dotpos - startpos;
uassert(15998, str::stream() <<
"field names cannot be zero length (in path \"" <<
fieldPath << "\")",
length > 0);
vFieldName.push_back(fieldPath.substr(startpos, length));
/* next time, search starting one spot after that */
startpos = dotpos + 1;
}
}
string FieldPath::getPath(bool fieldPrefix) const {
stringstream ss;
writePath(ss, fieldPrefix);
return ss.str();
}
void FieldPath::writePath(ostream &outStream, bool fieldPrefix) const {
if (fieldPrefix)
outStream << "$";
outStream << vFieldName[0];
const size_t n = vFieldName.size();
for(size_t i = 1; i < n; ++i)
outStream << "." << vFieldName[i];
}
FieldPath &FieldPath::operator=(const FieldPath &rRHS) {
if (this != &rRHS) {
vFieldName = rRHS.vFieldName;
}
return *this;
}
}
|
