1 | /* |
2 | * This file is part of Soprano Project. |
3 | * |
4 | * Copyright (C) 2007 Sebastian Trueg <trueg@kde.org> |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Library General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Library General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Library General Public License |
17 | * along with this library; see the file COPYING.LIB. If not, write to |
18 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
19 | * Boston, MA 02110-1301, USA. |
20 | */ |
21 | |
22 | #ifndef SOPRANO_DUMMY_MODEL_H |
23 | #define SOPRANO_DUMMY_MODEL_H |
24 | |
25 | #include "soprano_export.h" |
26 | #include "model.h" |
27 | |
28 | |
29 | namespace Soprano { |
30 | namespace Util { |
31 | /** |
32 | * \class DummyModel dummymodel.h Soprano/Util/DummyModel |
33 | * |
34 | * \brief A dummy model. All its methods do nothing and always |
35 | * fail with a default error. |
36 | * |
37 | * A dummy model might be useful in situations where a null pointer |
38 | * could lead to crashes if creating a real model fails. |
39 | * |
40 | * \author Sebastian Trueg <trueg@kde.org> |
41 | */ |
42 | class SOPRANO_EXPORT DummyModel : public Model |
43 | { |
44 | Q_OBJECT |
45 | |
46 | public: |
47 | /** |
48 | * Create a new dummy model. |
49 | */ |
50 | DummyModel(); |
51 | |
52 | /** |
53 | * destructor |
54 | */ |
55 | ~DummyModel(); |
56 | |
57 | //@{ |
58 | Error::ErrorCode addStatement( const Statement &statement ); |
59 | Error::ErrorCode addStatement( const Node& subject, const Node& predicate, const Node& object, const Node& context = Node() ); |
60 | Error::ErrorCode addStatements( const QList<Statement> &statements ); |
61 | //@} |
62 | |
63 | //@{ |
64 | Error::ErrorCode removeStatement( const Statement &statement ); |
65 | Error::ErrorCode removeStatement( const Node& subject, const Node& predicate, const Node& object, const Node& context = Node() ); |
66 | Error::ErrorCode removeAllStatements( const Statement &statement ); |
67 | Error::ErrorCode removeStatements( const QList<Statement> &statements ); |
68 | Error::ErrorCode removeContext( const Node& ); |
69 | Error::ErrorCode removeAllStatements(); |
70 | //@} |
71 | |
72 | //@{ |
73 | StatementIterator listStatements( const Statement &partial ) const; |
74 | StatementIterator listStatements( const Node& subject, const Node& predicate, const Node& object, const Node& context = Node() ) const; |
75 | StatementIterator listStatements() const; |
76 | StatementIterator listStatementsInContext( const Node &context ) const; |
77 | NodeIterator listContexts() const; |
78 | // QueryResultIterator executeQuery( const Query::Query& query ) const; |
79 | QueryResultIterator executeQuery( const QString& query, Query::QueryLanguage language, const QString& userQueryLanguage = QString() ) const; |
80 | //@} |
81 | |
82 | //@{ |
83 | bool containsAnyStatement( const Statement &statement ) const; |
84 | bool containsAnyStatement( const Node& subject, const Node& predicate, const Node& object, const Node& context = Node() ) const; |
85 | bool containsStatement( const Statement &statement ) const; |
86 | bool containsStatement( const Node& subject, const Node& predicate, const Node& object, const Node& context = Node() ) const; |
87 | bool containsContext( const Node &context ) const; |
88 | bool isEmpty() const; |
89 | int statementCount() const; |
90 | //@} |
91 | |
92 | //@{ |
93 | Error::ErrorCode write( QTextStream &os ) const; |
94 | //@} |
95 | |
96 | //@{ |
97 | Node createBlankNode(); |
98 | //@} |
99 | |
100 | private: |
101 | class Private; |
102 | Private* const d; |
103 | }; |
104 | } |
105 | } |
106 | |
107 | #endif |
108 | |