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1 | /* |
---|---|
2 | This file is part of the Nepomuk KDE project. |
3 | Copyright (C) 2009 Sebastian Trueg <trueg@kde.org> |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) version 3, or any |
9 | later version accepted by the membership of KDE e.V. (or its |
10 | successor approved by the membership of KDE e.V.), which shall |
11 | act as a proxy defined in Section 6 of version 3 of the license. |
12 | |
13 | This library is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | Lesser General Public License for more details. |
17 | |
18 | You should have received a copy of the GNU Lesser General Public |
19 | License along with this library. If not, see <http://www.gnu.org/licenses/>. |
20 | */ |
21 | |
22 | #ifndef _NEPOMUK2_QUERY_NEGATION_TERM_H_ |
23 | #define _NEPOMUK2_QUERY_NEGATION_TERM_H_ |
24 | |
25 | #include "simpleterm.h" |
26 | |
27 | #include "nepomuk_export.h" |
28 | |
29 | namespace Nepomuk2 { |
30 | namespace Query { |
31 | /** |
32 | * \class NegationTerm negationterm.h Nepomuk2/Query/NegationTerm |
33 | * |
34 | * \brief Negate an arbitrary term. |
35 | * |
36 | * %NegationTerm can be used to negate any other term. A typical example |
37 | * could be to match all resources that do not have a specific tag: |
38 | * |
39 | * \code |
40 | * NegationTerm::negateTerm( ComparisonTerm( Vocabulary::NAO::hasTag(), LiteralTerm("nepomuk") ) ); |
41 | * \endcode |
42 | * |
43 | * \author Sebastian Trueg <trueg@kde.org> |
44 | * |
45 | * \since 4.4 |
46 | */ |
47 | class NEPOMUK_EXPORT NegationTerm : public SimpleTerm |
48 | { |
49 | public: |
50 | /** |
51 | * Default constructor: creates an invalid negation term. |
52 | */ |
53 | NegationTerm(); |
54 | |
55 | /** |
56 | * Copy constructor. |
57 | */ |
58 | NegationTerm( const NegationTerm& term ); |
59 | |
60 | /** |
61 | * Destructor. |
62 | */ |
63 | ~NegationTerm(); |
64 | |
65 | /** |
66 | * Assignment operator. |
67 | */ |
68 | NegationTerm& operator=( const NegationTerm& term ); |
69 | |
70 | /** |
71 | * Negate \p term. This method will either strip the first NegationTerm |
72 | * from \p term or add one. |
73 | * |
74 | * \return The negated term. |
75 | */ |
76 | static Term negateTerm( const Term& term ); |
77 | }; |
78 | } |
79 | } |
80 | |
81 | #endif |
82 |
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