/usr/include/soprano/statement.h is in libsoprano-dev 2.9.4+dfsg1-0ubuntu4.
This file is owned by root:root, with mode 0o644.
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*
* Copyright (C) 2006 Daniele Galdi <daniele.galdi@gmail.com>
* Copyright (C) 2007-2009 Sebastian Trueg <trueg@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef SOPRANO_STATEMENT_H
#define SOPRANO_STATEMENT_H
#include "node.h"
#include "soprano_export.h"
namespace Soprano
{
/**
* \class Statement statement.h Soprano/Statement
*
* \brief A Statement instance represents one RDF quadruple.
*
* In %Soprano statements are quadruples, i.e. in addition to the subject, predicate, and
* object nodes, they have a fourth node, the context. The context represents the named graph
* in which the statement is stored. If the context is an empty node the statement is stored in
* the default graph.
*
* A Statement is valid if subject, predicate, and object are valid. Invalid statements can, however,
* be used in many methods such as Model::listStatements as wildwards.
*
* \sa Node
*
* \author Daniele Galdi <daniele.galdi@gmail.com><br>Sebastian Trueg <trueg@kde.org>
*/
class SOPRANO_EXPORT Statement
{
public:
//@{
/**
* Default Constructor, build an empty (invalid) Statement.
*/
Statement();
/**
* Build a Statement with the given subject, predicate and object.
*
* \param subject The subject (cannot be of type Node::LiteralNode)
*
* \param predicate The predicate (has to be of type Node::ResourceNode or Node::EmptyNode)
*
* \param object The object can be of either Node type.
*
* \param context The context node (has to be of type Node::ResourceNode or Node::EmptyNode)
*/
Statement( const Node &subject, const Node &predicate, const Node &object, const Node &context = Node() );
Statement( const Statement &other );
virtual ~Statement();
Statement& operator=( const Statement& other );
//@}
//@{
bool operator==( const Statement& other ) const;
bool operator!=( const Statement& other ) const;
/**
* Match this statement against template statement \a other. The only difference
* to operator== is that empty nodes are matched as wildcards,
* i.e. they match any other node.
*
* Be aware that the following is NOT always true since only \a other
* is treated a a wildcard:
*
* \code
* // NOT always true:
* a.matches(b) == b.matches(a)
* \endcode
*
* \return \p true if this statement matches other, \p false if not.
*
* \sa Node::matches()
*/
bool matches( const Statement& other ) const;
//@}
//@{
/**
* A Statement is valid if the subject is a resource or blank
* node, the predicate is a resource node,
* and the object is a valid node.
*
* \return @p true if the Statement is valid, @p false otherwise
*/
bool isValid() const;
//@}
//@{
/**
* \return The subject.
*/
Node subject() const;
/**
* \return The predicate.
*/
Node predicate() const;
/**
* \return The object.
*/
Node object() const;
/**
* \return The Context node.
*/
Node context() const;
//@}
//@{
/**
* Change the Statement subject.
*
* \param subject The new subject.
*/
void setSubject( const Node &subject );
/**
* Change the Statement predicate.
*
* \param predicate The new predicate.
*/
void setPredicate( const Node &predicate );
/**
* Change the Statement object.
*
* \param object The new object.
*/
void setObject( const Node &object );
/**
* Change the Statement context.
*
* \param context The new Context.
*/
void setContext( const Node &context );
//@}
private:
class Private;
QSharedDataPointer<Private> d;
};
/**
* \relates Soprano::Statement
*/
SOPRANO_EXPORT uint qHash( const Statement& s );
}
/**
* \relates Soprano::Statement
*/
SOPRANO_EXPORT QDebug operator<<( QDebug s, const Soprano::Statement& );
/**
* \relates Soprano::Statement
*/
SOPRANO_EXPORT QTextStream& operator<<( QTextStream& s, const Soprano::Statement& );
#endif // SOPRANO_STATEMENT_H
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