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syndication/rdf

  • syndication
  • rdf
resource.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 "resource.h"
24#include "model.h"
25#include "model_p.h"
26#include "nodevisitor.h"
27#include "property.h"
28#include "statement.h"
29
30#include <krandom.h>
31
32#include <QtCore/QList>
33#include <QtCore/QString>
34
35#include <boost/weak_ptr.hpp>
36
37using namespace boost;
38
39namespace Syndication {
40namespace RDF {
41
42class Resource::ResourcePrivate
43{
44 public:
45
46 QString uri;
47 weak_ptr<Model::ModelPrivate> model;
48 bool isAnon;
49 unsigned int id;
50
51 bool operator==(const ResourcePrivate& other) const
52 {
53 if (!isAnon && !other.isAnon)
54 return uri == other.uri;
55 else
56 return id == other.id;
57 }
58};
59
60Resource::Resource(const Resource& other) : Node(other)
61{
62 *this = other;
63}
64
65Resource::Resource() : d()
66{
67}
68
69Resource::Resource(const QString& uri) : d(new ResourcePrivate)
70{
71 if (uri.isNull())
72 {
73 d->uri = KRandom::randomString(10); // TODO: ensure uniqueness
74 d->isAnon = true;
75 }
76 else
77 {
78 d->uri = uri;
79 d->isAnon = false;
80 }
81
82 d->id = idCounter++;
83}
84
85Resource::~Resource()
86{
87}
88
89Resource& Resource::operator=(const Resource& other)
90{
91 d = other.d;
92 return *this;
93}
94
95bool Resource::operator==(const Node& other) const
96{
97 const Resource* o2 = dynamic_cast<const Resource*>(&other);
98 if (!o2)
99 return false;
100
101 if (!d || !o2->d)
102 return d == o2->d;
103 return *d == *(o2->d);
104}
105
106bool Resource::hasProperty(PropertyPtr property) const
107{
108 if (!d)
109 return false;
110 const shared_ptr<Model::ModelPrivate> m = d->model.lock();
111 if (!m)
112 return false;
113 return m->resourceHasProperty(this, property);
114}
115
116StatementPtr Resource::property(PropertyPtr property) const
117{
118 StatementPtr ptr(new Statement());
119 if (!d)
120 return ptr;
121 const shared_ptr<Model::ModelPrivate> m = d->model.lock();
122 if (!m)
123 return ptr;
124 return m->resourceProperty(this, property);
125}
126
127QList<StatementPtr> Resource::properties(PropertyPtr property) const
128{
129 if (!d)
130 return QList<StatementPtr>();
131 const shared_ptr<Model::ModelPrivate> m = d->model.lock();
132 if (!m)
133 return QList<StatementPtr>();
134
135 return m->resourceProperties(this, property);
136}
137
138Resource* Resource::clone() const
139{
140 return new Resource(*this);
141}
142
143void Resource::accept(NodeVisitor* visitor, NodePtr ptr)
144{
145 ResourcePtr rptr = boost::static_pointer_cast<Resource>(ptr);
146 if (!visitor->visitResource(rptr))
147 Node::accept(visitor, ptr);
148}
149
150unsigned int Resource::id() const
151{
152 return d ? d->id : 0;
153}
154
155bool Resource::isNull() const
156{
157 return !d;
158}
159
160Model Resource::model() const
161{
162 if (!d)
163 return Model();
164
165 const shared_ptr<Model::ModelPrivate> mp = d->model.lock();
166
167 Model m;
168
169 if (mp)
170 m.d = mp;
171
172 return m;
173}
174
175bool Resource::isResource() const
176{
177 return true;
178}
179
180bool Resource::isProperty() const
181{
182 return false;
183}
184
185bool Resource::isLiteral() const
186{
187 return false;
188}
189
190bool Resource::isAnon() const
191{
192 return d ? d->isAnon : false;
193}
194
195bool Resource::isSequence() const
196{
197 return false;
198}
199
200void Resource::setModel(const Model& model)
201{
202 if (d)
203 d->model = model.d;
204}
205
206void Resource::setId(unsigned int id)
207{
208 if (d)
209 d->id = id;
210}
211
212QString Resource::text() const
213{
214 return QString();
215}
216
217QString Resource::uri() const
218{
219 return d ? d->uri : QString();
220}
221
222} // namespace RDF
223} // namespace Syndication
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::visitResource
virtual bool visitResource(ResourcePtr resource)
reimplement this method to handle resources.
Definition: nodevisitor.cpp:55
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
Syndication::RDF::Resource
Resources are the entities in the RDF graph.
Definition: resource.h:52
Syndication::RDF::Resource::isLiteral
virtual bool isLiteral() const
returns false
Definition: resource.cpp:185
Syndication::RDF::Resource::isNull
virtual bool isNull() const
returns whether the resource is a null resource
Definition: resource.cpp:155
Syndication::RDF::Resource::~Resource
virtual ~Resource()
destructor
Definition: resource.cpp:85
Syndication::RDF::Resource::isAnon
virtual bool isAnon() const
returns whether this resource is an anonymous resource
Definition: resource.cpp:190
Syndication::RDF::Resource::property
virtual StatementPtr property(PropertyPtr property) const
returns a statement from the associated model where this resource is the subject and the given proper...
Definition: resource.cpp:116
Syndication::RDF::Resource::hasProperty
virtual bool hasProperty(PropertyPtr property) const
returns whether the resource has a property property in the associated model.
Definition: resource.cpp:106
Syndication::RDF::Resource::properties
virtual QList< StatementPtr > properties(PropertyPtr property) const
returns the list of all statements from the associated model where this resource is the subject and t...
Definition: resource.cpp:127
Syndication::RDF::Resource::id
virtual unsigned int id() const
the identifier of this node.
Definition: resource.cpp:150
Syndication::RDF::Resource::accept
virtual void accept(NodeVisitor *visitor, NodePtr ptr)
Used by visitors for double dispatch.
Definition: resource.cpp:143
Syndication::RDF::Resource::isSequence
virtual bool isSequence() const
returns true if this resource is also a sequence, false otherwise.
Definition: resource.cpp:195
Syndication::RDF::Resource::setId
virtual void setId(unsigned int id)
used in Model
Definition: resource.cpp:206
Syndication::RDF::Resource::setModel
virtual void setModel(const Model &model)
used in Model
Definition: resource.cpp:200
Syndication::RDF::Resource::operator==
bool operator==(const Node &other) const
checks two resources for equality.
Definition: resource.cpp:95
Syndication::RDF::Resource::operator=
Resource & operator=(const Resource &other)
assigns a resource
Definition: resource.cpp:89
Syndication::RDF::Resource::model
virtual Model model() const
the model this resource belongs to
Definition: resource.cpp:160
Syndication::RDF::Resource::text
virtual QString text() const
returns a null string
Definition: resource.cpp:212
Syndication::RDF::Resource::uri
virtual QString uri() const
returns the URI of the resource
Definition: resource.cpp:217
Syndication::RDF::Resource::Resource
Resource()
creates a null resource
Definition: resource.cpp:65
Syndication::RDF::Resource::isResource
virtual bool isResource() const
returns true
Definition: resource.cpp:175
Syndication::RDF::Resource::clone
virtual Resource * clone() const
creates a copy of the resource object
Definition: resource.cpp:138
Syndication::RDF::Resource::isProperty
virtual bool isProperty() const
returns true if this resource is also a property, false otherwise
Definition: resource.cpp:180
Syndication::RDF::Statement
An RDF statement, consisting of a triple (subject, predicate, object).
Definition: statement.h:44
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