blob: ab1cbc7046bd97925381104a92bc476240f41162 (
plain)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/**
* Copyright (C) 2012 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 "mongo/db/field_ref.h"
#include "mongo/util/log.h"
#include "mongo/util/assert_util.h"
namespace mongo {
void FieldRef::parse(const StringData& dottedField) {
if (dottedField.size() == 0) {
return;
}
if (_size != 0) {
clear();
}
// We guarantee that accesses through getPart() will be valid while 'this' is. So we
// take a copy. We're going to be "chopping" up the copy into c-strings.
_fieldBase.reset(new char[dottedField.size()+1]);
dottedField.copyTo( _fieldBase.get(), true );
// Separate the field parts using '.' as a delimiter.
char* beg = _fieldBase.get();
char* cur = beg;
char* end = beg + dottedField.size();
while (true) {
if (cur != end && *cur != '.') {
cur++;
continue;
}
appendPart(StringData(beg, cur - beg));
if (cur != end) {
*cur = '\0';
beg = ++cur;
continue;
}
break;
}
}
void FieldRef::setPart(size_t i, const StringData& part) {
dassert(i < _size);
if (_replacements.size() != _size) {
_replacements.resize(_size);
}
_replacements[i] = part.toString();
if (i < kReserveAhead) {
_fixed[i] = _replacements[i];
}
else {
_variable[getIndex(i)] = _replacements[i];
}
}
size_t FieldRef::appendPart(const StringData& part) {
if (_size < kReserveAhead) {
_fixed[_size] = part;
}
else {
_variable.push_back(part);
}
return ++_size;
}
StringData FieldRef::getPart(size_t i) const {
dassert(i < _size);
if (i < kReserveAhead) {
return _fixed[i];
}
else {
return _variable[getIndex(i)];
}
}
void FieldRef::clear() {
_size = 0;
_variable.clear();
_fieldBase.reset();
_replacements.clear();
}
std::string FieldRef::dottedField( size_t offset ) const {
std::string res;
if (_size == 0 || offset >= numParts() ) {
return res;
}
for (size_t i=offset; i<_size; i++) {
if ( i > offset )
res.append(1, '.');
StringData part = getPart(i);
res.append(part.rawData(), part.size());
}
return res;
}
bool FieldRef::isPrefixOf( const FieldRef& other ) const {
// Can't be a prefix if equal to or larger
if ( other._size <= _size )
return false;
for ( size_t i = 0; i < _size; i++ ) {
// Get parts
StringData part = getPart( i );
StringData otherPart = other.getPart( i );
// If the parts are diff, can't be a prefix
if ( part != otherPart )
return false;
}
return true;
}
bool FieldRef::equalsDottedField( const StringData& other ) const {
StringData rest = other;
for ( size_t i = 0; i < _size; i++ ) {
StringData part = getPart( i );
if ( !rest.startsWith( part ) )
return false;
if ( i == _size - 1 )
return rest.size() == part.size();
// make sure next thing is a dot
if ( rest.size() == part.size() )
return false;
if ( rest[part.size()] != '.' )
return false;
rest = rest.substr( part.size() + 1 );
}
return false;
}
size_t FieldRef::numReplaced() const {
size_t res = 0;
for (size_t i = 0; i < _replacements.size(); i++) {
if (!_replacements[i].empty()) {
res++;
}
}
return res;
}
} // namespace mongo
|
