1 
2 /**
3  *    Copyright (C) 2018-present MongoDB, Inc.
4  *
5  *    This program is free software: you can redistribute it and/or modify
6  *    it under the terms of the Server Side Public License, version 1,
7  *    as published by MongoDB, Inc.
8  *
9  *    This program is distributed in the hope that it will be useful,
10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *    Server Side Public License for more details.
13  *
14  *    You should have received a copy of the Server Side Public License
15  *    along with this program. If not, see
16  *    <http://www.mongodb.com/licensing/server-side-public-license>.
17  *
18  *    As a special exception, the copyright holders give permission to link the
19  *    code of portions of this program with the OpenSSL library under certain
20  *    conditions as described in each individual source file and distribute
21  *    linked combinations including the program with the OpenSSL library. You
22  *    must comply with the Server Side Public License in all respects for
23  *    all of the code used other than as permitted herein. If you modify file(s)
24  *    with this exception, you may extend this exception to your version of the
25  *    file(s), but you are not obligated to do so. If you do not wish to do so,
26  *    delete this exception statement from your version. If you delete this
27  *    exception statement from all source files in the program, then also delete
28  *    it in the license file.
29  */
30 
31 #include "mongo/db/index/btree_access_method.h"
32 
33 #include <vector>
34 
35 #include "mongo/base/status.h"
36 #include "mongo/base/status_with.h"
37 #include "mongo/db/catalog/index_catalog_entry.h"
38 #include "mongo/db/jsobj.h"
39 #include "mongo/db/keypattern.h"
40 
41 namespace mongo {
42 
43 using std::vector;
44 
45 // Standard Btree implementation below.
BtreeAccessMethod(IndexCatalogEntry * btreeState,SortedDataInterface * btree)46 BtreeAccessMethod::BtreeAccessMethod(IndexCatalogEntry* btreeState, SortedDataInterface* btree)
47     : IndexAccessMethod(btreeState, btree) {
48     // The key generation wants these values.
49     vector<const char*> fieldNames;
50     vector<BSONElement> fixed;
51 
52     BSONObjIterator it(_descriptor->keyPattern());
53     while (it.more()) {
54         BSONElement elt = it.next();
55         fieldNames.push_back(elt.fieldName());
56         fixed.push_back(BSONElement());
57     }
58 
59     _keyGenerator = BtreeKeyGenerator::make(_descriptor->version(),
60                                             fieldNames,
61                                             fixed,
62                                             _descriptor->isSparse(),
63                                             btreeState->getCollator());
64     massert(16745, "Invalid index version for key generation.", _keyGenerator);
65 }
66 
doGetKeys(const BSONObj & obj,GetKeysContext context,BSONObjSet * keys,MultikeyPaths * multikeyPaths) const67 void BtreeAccessMethod::doGetKeys(const BSONObj& obj,
68                                   GetKeysContext context,
69                                   BSONObjSet* keys,
70                                   MultikeyPaths* multikeyPaths) const {
71     _keyGenerator->getKeys(obj, keys, multikeyPaths);
72 }
73 
74 }  // namespace mongo
75