Syndication

literal.h
1 /*
2  This file is part of the syndication library
3  SPDX-FileCopyrightText: 2006 Frank Osterfeld <[email protected]>
4 
5  SPDX-License-Identifier: LGPL-2.0-or-later
6 */
7 
8 #ifndef SYNDICATION_RDF_LITERAL_H
9 #define SYNDICATION_RDF_LITERAL_H
10 
11 #include <QString>
12 #include <syndication/rdf/node.h>
13 
14 namespace Syndication
15 {
16 namespace RDF
17 {
18 class Literal;
19 
20 //@cond PRIVATE
21 typedef QSharedPointer<Literal> LiteralPtr;
22 //@endcond
23 
24 /**
25  * a node type representing simple string values. Literals can
26  * be object of statement, but neither subject nor predicate.
27  */
28 class SYNDICATION_EXPORT Literal : public Node
29 {
30 public:
31  /**
32  * creates a null literal. text() will return a null string.
33  */
34  Literal();
35 
36  /**
37  * copies a literal node
38  *
39  * @param other the literal node to copy
40  */
41  Literal(const Literal &other);
42 
43  /**
44  * creates a new literal node with a given text
45  *
46  * @param text the literal string
47  */
48  explicit Literal(const QString &text);
49 
50  /**
51  * destructor
52  */
53  ~Literal() override;
54 
55  /**
56  * assigns another literal
57  *
58  * @param other the literal to assign
59  */
60  virtual Literal &operator=(const Literal &other);
61 
62  /**
63  * two literal nodes are equal iff their text _and_ ID's
64  * are equal.
65  */
66  bool operator==(const Node &other) const override;
67 
68  /**
69  * clones the literal node.
70  */
71  Literal *clone() const override;
72 
73  /**
74  * Used by visitors for double dispatch. See NodeVisitor
75  * for more information.
76  * @param visitor the visitor calling the method
77  * @param ptr a shared pointer object for this node
78  */
79  void accept(NodeVisitor *visitor, NodePtr ptr) override;
80 
81  /**
82  * returns whether this node is a null node
83  */
84  bool isNull() const override;
85 
86  /**
87  * the identifier of this node. the ID is unique per model
88  * and set by the associated model at creation time.
89  */
90  unsigned int id() const override;
91 
92  /**
93  * returns false, as a literal is not a resource
94  */
95  bool isResource() const override;
96  /**
97  * returns false, as a literal is not a property
98  */
99  bool isProperty() const override;
100 
101  /**
102  * returns true for literals
103  */
104  bool isLiteral() const override;
105 
106  /**
107  * returns false, literals are not anonymous resources
108  */
109  bool isAnon() const override;
110 
111  /**
112  * returns false, literals are not sequences
113  */
114  bool isSequence() const override;
115 
116  /**
117  * implicit conversion to string. returns text()
118  */
119  virtual operator QString() const;
120 
121  /**
122  * the string value of the literal
123  */
124  QString text() const override;
125 
126  /**
127  * used in Model
128  * @internal
129  */
130  void setModel(const Model &model) override;
131 
132  /**
133  * used in Model
134  * @internal
135  */
136  void setId(unsigned int id) override;
137 
138 private:
139  class LiteralPrivate;
140  typedef QSharedPointer<LiteralPrivate> LiteralPrivatePtr;
141  LiteralPrivatePtr d;
142 };
143 
144 } // namespace RDF
145 } // namespace Syndication
146 
147 #endif // SYNDICATION_RDF_LITERAL_H
bool operator==(const Qt3DRender::QGraphicsApiFilter &reference, const Qt3DRender::QGraphicsApiFilter &sample)
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