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138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
/*
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* This file is part of the syndication library
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*
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* Copyright (C) 2006 Frank Osterfeld <osterfeld@kde.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SYNDICATION_RDF_STATEMENT_H
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#define SYNDICATION_RDF_STATEMENT_H
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#include <syndication/rdf/property.h>
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#include <boost/smart_ptr/shared_ptr.hpp>
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class QString;
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namespace Syndication {
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namespace RDF {
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//@cond PRIVATE
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class Statement;
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typedef boost::shared_ptr<Statement> StatementPtr;
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//@endcond
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/**
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* An RDF statement, consisting of a triple
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* (subject, predicate, object).
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*/
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class SYNDICATION_EXPORT Statement
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{
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friend class Model;
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public:
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/**
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* creates a null statement
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*/
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Statement();
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/**
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* creates a copy of another statement
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*
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* @param other the statement to copy
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*/
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Statement(const Statement& other);
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/**
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* creates a statement
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* Do not call this in your code, use Model::createStatement() instead.
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*
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* @param subject the subject resource of the statement
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* @param predicate the predicate of the statement
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* @param object the object node of the statement
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*/
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Statement(ResourcePtr subject, PropertyPtr predicate, NodePtr object);
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/**
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* destructor
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*/
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virtual ~Statement();
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/**
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* assigns another statement
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*
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* @param other the statement to assign
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*/
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Statement& operator=(const Statement& other);
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/**
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* returns whether two statements are equal.
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* Currently statements are equal, if they are from the same model (!)
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* and subject, predicate and object are equal.
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*
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* @param other the statement to compare to
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*/
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virtual bool operator==(const Statement& other) const;
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/**
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* returns whether this statement is a null statement (i.e. was created
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* using Statement())
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*/
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virtual bool isNull() const;
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/**
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* the subject of the statement.
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*/
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virtual ResourcePtr subject() const;
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/**
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* the predicate of the statement
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*/
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virtual PropertyPtr predicate() const;
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/**
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* the object of the statement
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*/
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virtual NodePtr object() const;
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/**
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* returns the object of this statement as resource, if possible.
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*
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* @return the object node as Resource, or @c null if the object
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* is not a resource
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*/
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virtual ResourcePtr asResource() const;
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/**
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* returns the object of this statement as string, if possible.
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*
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* @return the literal text as QString, or a null string if the object
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* is not a literal
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*/
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virtual QString asString() const;
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private:
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class StatementPrivate;
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boost::shared_ptr<StatementPrivate> d;
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};
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} // namespace RDF
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} // namespace Syndication
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#endif // SYNDICATION_RDF_STATEMENT_H
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