/usr/include/soprano/statementiterator.h is in libsoprano-dev 2.7.6+dfsg.1-2wheezy1.
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* This file is part of Soprano Project.
*
* Copyright (C) 2006 Daniele Galdi <daniele.galdi@gmail.com>
* Copyright (C) 2007 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_ITERATOR_H
#define SOPRANO_STATEMENT_ITERATOR_H
#include "iterator.h"
#include "statement.h"
#include "soprano_export.h"
#include <QtCore/QList>
namespace Soprano {
class Node;
class NodeIterator;
class Statement;
class StatementIteratorBackend;
/**
* \class StatementIterator statementiterator.h Soprano/StatementIterator
*
* \brief An iterator that provides a stream of Statements.
*
* The most common use of StatementIterator is through Model::listStatements().
*
* Many backends do lock the underlying Model during iteration. Thus,
* it is always a good idea to cache the results if they are to be used
* to modify the model to prevent a deadlock:
*
* \code
* Soprano::StatementIterator it = model->listStatements();
* QList<Statement> allStatements = it.allElements();
* Q_FOREACH( Soprano::Statement s, allStatements ) {
* modifyTheModel( model, s );
* }
* \endcode
*
* Iterators have to be closed.
* This can either be achieved by deleting the iterator, finishing it (next() does return \p false),
* or calling close(). Before that other operations on the Model may block.
*
* Iterators are not thread-safe. Two threads using the same iterator may result
* in undefined behaviour and even crashes. An iterator needs to be closed by the
* same thread that opened it (except if the iterator contains special code to handle such
* a situation.)
*
* \warning Be aware that iterators in Soprano are shared objects which means
* that copies of one iterator object work on the same data.
*
* For further details on %Soprano iterators see Iterator.
*
* \author Daniele Galdi <daniele.galdi@gmail.com><br>Sebastian Trueg <trueg@kde.org>
*/
class SOPRANO_EXPORT StatementIterator : public Iterator<Statement>
{
public:
/**
* Creates and empty, invalid iterator.
*/
StatementIterator();
/**
* Create a new StatementIterator instance that uses sti as backend.
* StatementIterator will take ownership of the backend.
*/
StatementIterator( IteratorBackend<Statement> *sti );
StatementIterator( const StatementIterator &sti );
virtual ~StatementIterator();
StatementIterator& operator=( const StatementIterator& );
/**
* Convenience method which extracts all statements (this does not include the
* statements that have already been read from the iterator) from the iterator
* and returns them in a list.
*
* Be aware that after calling this method the iterator will be invalid.
*
* \return A list of all statements that rest in the iterator.
*/
QList<Statement> allStatements() { return allElements(); }
/**
* Convenience method that creates an iterator over the subject nodes of the statements
* in this iterator.
*
* \warning The new iterator is just a wrapper around this one. Thus, changing it will also
* change this one.
*
* \return A wrapper iterator over the subject nodes.
*/
NodeIterator iterateSubjects() const;
/**
* Convenience method that creates an iterator over the predicate nodes of the statements
* in this iterator.
*
* \warning The new iterator is just a wrapper around this one. Thus, changing it will also
* change this one.
*
* \return A wrapper iterator over the predicate nodes.
*/
NodeIterator iteratePredicates() const;
/**
* Convenience method that creates an iterator over the object nodes of the statements
* in this iterator.
*
* \warning The new iterator is just a wrapper around this one. Thus, changing it will also
* change this one.
*
* \return A wrapper iterator over the object nodes.
*/
NodeIterator iterateObjects() const;
/**
* Convenience method that creates an iterator over the context nodes of the statements
* in this iterator.
*
* \warning The new iterator is just a wrapper around this one. Thus, changing it will also
* change this one.
*
* \return A wrapper iterator over the context nodes.
*/
NodeIterator iterateContexts() const;
};
}
#endif // SOPRANO_STATEMENT_ITERATOR_H
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