/usr/include/soprano/sparqlmodel.h is in libsoprano-dev 2.9.4+dfsg-5.
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* This file is part of Soprano Project.
*
* Copyright (C) 2007 Rajeev J Sebastian <rajeev.sebastian@gmail.com>
* Copyright (C) 2008-2009 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_SPARQL_MODEL_H_
#define _SOPRANO_SPARQL_MODEL_H_
#include "model.h"
#include "soprano_export.h"
#include "asyncresult.h"
namespace Soprano {
namespace Client {
/**
* \class SparqlModel sparqlmodel.h Soprano/Client/SparqlModel
*
* \brief Remote client Model for Http SPARQL end points.
*
* The SparqlModel provides a very simple way of accessing remote
* <a href="http://www.w3.org/TR/rdf-sparql-protocol/">SPARQL (SPARQL Protocol and RDF Query Language)</a>
* web services via Http.
*
* Its usage is simple: set hostname and optionally user credentials, then
* call the well known Model methods like Model::executeQuery to work with the remote
* repository.
*
* \author Rajeev J Sebastian <rajeev.sebastian@gmail.com><br>Sebastian Trueg <trueg@kde.org>
*
* \since 2.2
*/
class SOPRANO_CLIENT_EXPORT SparqlModel : public Soprano::Model
{
Q_OBJECT
public:
/**
* Create a new SparqlModel instance.
*
* \param host The host to connect to (example: dbpedia.org)
* \param port The port on which to connect the host (most
* Http services run on port 80.
* \param user The userName in case the host does not allow
* anonymous access.
* \param password The password for \p user in case the host
* does not allow anonymous access.
*/
SparqlModel( const QString& host = QString(),
quint16 port = 80,
const QString& user = QString(),
const QString& password = QString() );
/**
* Destructor.
*/
~SparqlModel();
//@{
/**
* Set the host to connect to.
*
* \param host The host to connect to (example: dbpedia.org)
* \param port The port on which to connect the host (most
* Http services run on port 80.
*/
void setHost( const QString& host, quint16 port = 80 );
/**
* Set the user name and password to access the host.
*
* \param user The userName in case the host does not allow
* anonymous access.
* \param password The password for \p user in case the host
*/
void setUser( const QString& user, const QString& password = QString() );
/**
* Set the path to where the SPARQL endpoint is exposed on the server.
*
* For historical reasons the default path is set to "/sparql".
*
* \since 2.2.1
*/
void setPath( const QString& path );
//@}
//@{
/**
* Add a statement to the remote model.
*
* This method is realized using the <a href="http://jena.hpl.hp.com/~afs/SPARQL-Update.html">SPARQL/Update</a>
* language extension. Thus, it will only work on services supporting this extension.
*
* \param statement The Statement to add.
*
* \return Error::ErrorNone on success and an error code if statement was invalid or an error
* occured. Check Error::ErrorCache::lastError for detailed error information.
*/
Error::ErrorCode addStatement( const Statement& statement );
/**
* Removed a statement from the remote model.
*
* This method is realized using the <a href="http://jena.hpl.hp.com/~afs/SPARQL-Update.html">SPARQL/Update</a>
* language extension. Thus, it will only work on services supporting this extension.
*
* \param statement The Statement to remove.
*
* \return Error::ErrorNone on success and an error code if statement was invalid or an error
* occured. Check Error::ErrorCache::lastError for detailed error information.
*/
Error::ErrorCode removeStatement( const Statement& statement );
/**
* Remove all statements that match the partial statement. For removing
* one specific statement see removeStatement().
*
* This method is realized using the <a href="http://jena.hpl.hp.com/~afs/SPARQL-Update.html">SPARQL/Update</a>
* language extension. Thus, it will only work on services supporting this extension.
*
* \param statement A possible partially defined statement that serves as
* a filter for all statements that should be removed.
*
* \return Error::ErrorNone on success and an error code if statement was invalid or an error
* occured. Check Error::ErrorCache::lastError for detailed error information.
*/
Error::ErrorCode removeAllStatements( const Statement& statement );
//@}
//@{
/**
* \reimpl
*/
Soprano::StatementIterator listStatements( const Statement& partial ) const;
/**
* Asyncroneously list statements.
*
* \param statement The partial Statement to match.
*
* \return an AsyncResult with result type StatementIterator
* object which will signal when the result is ready.
*
* \since 2.4
*/
Soprano::Util::AsyncResult* listStatementsAsync( const Statement& statement ) const;
/**
* Execute a query on the SPARQL endpoint.
*
* \param query The query to evaluate.
* \param language The query language used to encode \p query. Be aware that
* the SparqlModel does only support one query language: Query::QueryLanguageSparql.
* \param userQueryLanguage unused since \p language needs to be set to Query::QueryLanguageSparql.
*
* \return An iterator over all results matching the query,
* on error an invalid iterator is returned.
*/
Soprano::QueryResultIterator executeQuery( const QString& query,
Query::QueryLanguage language = Query::QueryLanguageSparql,
const QString& userQueryLanguage = QString() ) const;
/**
* Asyncroneously execute the given query over the Model.
*
* \param query The query to evaluate.
* \param language The %query language used to encode \p query.
* \param userQueryLanguage If \p language equals Query::QueryLanguageUser
* userQueryLanguage defines the language to use.
*
* \sa executeQuery
*
* \return an AsyncResult with result type QueryResultIterator
* object which will signal when the result is ready.
*/
Soprano::Util::AsyncResult* executeQueryAsync( const QString& query,
Query::QueryLanguage language = Query::QueryLanguageSparql,
const QString& userQueryLanguage = QString() ) const;
/**
* \reimpl
*/
NodeIterator listContexts() const;
/**
* Asyncroneously list all contexts.
*
* \param statement The partial Statement to match.
*
* \return an AsyncResult with result type NodeIterator
* object which will signal when the result is ready.
*
* \since 2.4
*/
Soprano::Util::AsyncResult* listContextsAsync() const;
/**
* \reimpl
*/
bool containsStatement( const Statement& statement ) const;
/**
* \reimpl
*/
bool containsAnyStatement( const Statement& statement ) const;
//@}
//@{
/**
* Retrieving the number of statements is not supported by the SparqlModel.
*
* \return -1
*/
int statementCount() const;
/**
* Not supported by the SparqlModel.
*
* \return false
*/
bool isEmpty() const;
//@}
/**
* Creation of blank nodes is not supported by the SparqlModel.
*
* \return an invalid Node
*/
Node createBlankNode();
using Model::addStatement;
using Model::removeStatement;
using Model::removeAllStatements;
using Model::listStatements;
using Model::containsStatement;
using Model::containsAnyStatement;
private Q_SLOTS:
void slotRequestFinished( int id, bool error, const QByteArray& data );
private:
class Private;
Private* const d;
};
}
}
#endif
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