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syndication/rdf

  • syndication
  • rdf
literal.cpp
1/*
2 * This file is part of the syndication library
3 *
4 * Copyright (C) 2006 Frank Osterfeld <osterfeld@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
23#include "literal.h"
24#include "nodevisitor.h"
25
26#include <QtCore/QString>
27
28namespace Syndication {
29namespace RDF {
30
31class Literal::LiteralPrivate
32{
33 public:
34
35 QString text;
36 unsigned int id;
37
38 bool operator==(const LiteralPrivate& other) const
39 {
40 return text == other.text;
41 }
42};
43
44Literal::Literal() : d()
45{
46}
47
48Literal::Literal(const Literal& other) : Node(other)
49{
50 d = other.d;
51}
52
53Literal* Literal::clone() const
54{
55 return new Literal(*this);
56}
57
58void Literal::accept(NodeVisitor* visitor, NodePtr ptr)
59{
60 LiteralPtr lptr = boost::static_pointer_cast<Syndication::RDF::Literal>(ptr);
61 if (!visitor->visitLiteral(lptr))
62 Node::accept(visitor, ptr);
63}
64
65Literal::Literal(const QString& text) : d(new LiteralPrivate)
66{
67 d->text = text;
68 d->id = idCounter++;
69}
70
71Literal::~Literal()
72{
73}
74
75Literal& Literal::operator=(const Literal& other)
76{
77 d = other.d;
78 return *this;
79}
80
81bool Literal::operator==(const Node& other) const
82{
83 const Literal* o2 = dynamic_cast<const Literal*>(&other);
84 if (!o2)
85 return false;
86
87 if (!d || !o2->d)
88 return d == o2->d;
89
90 return *d == *(o2->d);
91}
92
93bool Literal::isNull() const
94{
95 return !d;
96}
97
98unsigned int Literal::id() const
99{
100 return d ? d->id : 0;
101}
102
103bool Literal::isResource() const
104{
105 return false;
106}
107
108bool Literal::isProperty() const
109{
110 return false;
111}
112
113bool Literal::isLiteral() const
114{
115 return true;
116}
117
118bool Literal::isAnon() const
119{
120 return false;
121}
122
123bool Literal::isSequence() const
124{
125 return false;
126}
127
128QString Literal::text() const
129{
130 return d ? d->text : QString();
131}
132
133Literal::operator QString() const
134{
135 return d ? d->text : QString();
136}
137
138void Literal::setModel(const Model& /*model*/)
139{
140}
141
142void Literal::setId(unsigned int id)
143{
144 d->id = id;
145}
146
147} // namespace RDF
148} // namespace Syndication
Syndication::RDF::Literal
a node type representing simple string values.
Definition: literal.h:45
Syndication::RDF::Literal::setModel
virtual void setModel(const Model &model)
used in Model
Definition: literal.cpp:138
Syndication::RDF::Literal::Literal
Literal()
creates a null literal.
Definition: literal.cpp:44
Syndication::RDF::Literal::operator=
virtual Literal & operator=(const Literal &other)
assigns another literal
Definition: literal.cpp:75
Syndication::RDF::Literal::setId
virtual void setId(unsigned int id)
used in Model
Definition: literal.cpp:142
Syndication::RDF::Literal::isSequence
virtual bool isSequence() const
returns false, literals are not sequences
Definition: literal.cpp:123
Syndication::RDF::Literal::operator==
virtual bool operator==(const Node &other) const
two literal nodes are equal iff their text and ID's are equal.
Definition: literal.cpp:81
Syndication::RDF::Literal::accept
virtual void accept(NodeVisitor *visitor, NodePtr ptr)
Used by visitors for double dispatch.
Definition: literal.cpp:58
Syndication::RDF::Literal::isNull
virtual bool isNull() const
returns whether this node is a null node
Definition: literal.cpp:93
Syndication::RDF::Literal::id
virtual unsigned int id() const
the identifier of this node.
Definition: literal.cpp:98
Syndication::RDF::Literal::isProperty
virtual bool isProperty() const
returns false, as a literal is not a property
Definition: literal.cpp:108
Syndication::RDF::Literal::~Literal
virtual ~Literal()
destructor
Definition: literal.cpp:71
Syndication::RDF::Literal::isAnon
virtual bool isAnon() const
returns false, literals are not anonymous resources
Definition: literal.cpp:118
Syndication::RDF::Literal::isLiteral
virtual bool isLiteral() const
returns true for literals
Definition: literal.cpp:113
Syndication::RDF::Literal::isResource
virtual bool isResource() const
returns false, as a literal is not a resource
Definition: literal.cpp:103
Syndication::RDF::Literal::clone
virtual Literal * clone() const
clones the literal node.
Definition: literal.cpp:53
Syndication::RDF::Literal::text
virtual QString text() const
the string value of the literal
Definition: literal.cpp:128
Syndication::RDF::Model
An RDF model, a set of RDF statements.
Definition: model.h:50
Syndication::RDF::NodeVisitor
Visitor interface, following the Visitor design pattern.
Definition: nodevisitor.h:58
Syndication::RDF::NodeVisitor::visitLiteral
virtual bool visitLiteral(LiteralPtr)
reimplement this method to handle literals.
Definition: nodevisitor.cpp:40
Syndication::RDF::Node
an RDF node, abstract baseclass for all RDF node types, like resources and literals
Definition: node.h:44
Syndication::RDF::Node::accept
virtual void accept(NodeVisitor *visitor, NodePtr ptr)
Used by visitors for double dispatch.
Definition: node.cpp:31
Syndication::RDF::Node::idCounter
static unsigned int idCounter
used to generate unique IDs for node objects
Definition: node.h:135
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