Baloo

postingdb.h
1/*
2 This file is part of the KDE Baloo project.
3 SPDX-FileCopyrightText: 2015 Vishesh Handa <me@vhanda.in>
4
5 SPDX-License-Identifier: LGPL-2.1-or-later
6*/
7
8#ifndef BALOO_POSTINGDB_H
9#define BALOO_POSTINGDB_H
10
11#include "postingiterator.h"
12
13#include <QByteArray>
14#include <QVector>
15#include <QRegularExpression>
16
17#include <lmdb.h>
18
19namespace Baloo {
20
21typedef QVector<quint64> PostingList;
22
23/**
24 * The PostingDB is the main database that maps <term> -> <id1> <id2> <id2> ...
25 * This is used to lookup ids when searching for a <term>.
26 */
27class BALOO_ENGINE_EXPORT PostingDB
28{
29public:
30 PostingDB(MDB_dbi, MDB_txn* txn);
31 ~PostingDB();
32
33 static MDB_dbi create(MDB_txn* txn);
34 static MDB_dbi open(MDB_txn* txn);
35
36 void put(const QByteArray& term, const PostingList& list);
37 PostingList get(const QByteArray& term);
38 void del(const QByteArray& term);
39
40 PostingIterator* iter(const QByteArray& term);
41 PostingIterator* prefixIter(const QByteArray& term);
42 PostingIterator* regexpIter(const QRegularExpression& regexp, const QByteArray& prefix);
43
44 enum Comparator {
45 LessEqual,
46 GreaterEqual,
47 };
48 // For integral types only:
49 template<typename T>
50 typename std::enable_if<std::is_integral<T>::value, PostingIterator*>::type
51 compIter(const QByteArray& prefix, T val, Comparator com) {
52 qlonglong l = val;
53 return compIter(prefix, l, com);
54 }
55 PostingIterator* compIter(const QByteArray& prefix, qlonglong val, Comparator com);
56 PostingIterator* compIter(const QByteArray& prefix, double val, Comparator com);
57 PostingIterator* compIter(const QByteArray& prefix, const QByteArray& val, Comparator com);
58
59 QVector<QByteArray> fetchTermsStartingWith(const QByteArray& term);
60
61 QMap<QByteArray, PostingList> toTestMap() const;
62private:
63 template <typename Validator>
64 PostingIterator* iter(const QByteArray& prefix, Validator validate);
65
66 MDB_txn* m_txn;
67 MDB_dbi m_dbi;
68};
69
70}
71
72#endif // BALOO_POSTINGDB_H
The PostingDB is the main database that maps -> <id1> <id2> <id2> ... This is used to lookup ids whe...
Definition postingdb.h:28
A PostingIterator is an abstract base class which can be used to iterate over all the "postings" or "...
Implements storage for docIds without any associated data Instantiated for:
Definition coding.cpp:11
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