C++ QueryResultIterator::next方法代码示例

void MainWindow::query()
{
  if (tag->text().isEmpty() && text->toPlainText().isEmpty())
    return;

  static Soprano::Model *model = Nepomuk2::ResourceManager::instance()->mainModel();

  Nepomuk2::Query::ComparisonTerm tag_term;
  Nepomuk2::Query::LiteralTerm text_term;
  if (!tag->text().isEmpty())
    tag_term = Nepomuk2::Query::ComparisonTerm(Soprano::Vocabulary::NAO::hasTag(), Nepomuk2::Query::LiteralTerm(tag->text()));
  if (!text->toPlainText().isEmpty())
    text_term = Nepomuk2::Query::LiteralTerm(text->toPlainText());

  Nepomuk2::Query::Query query(Nepomuk2::Query::AndTerm(tag_term, text_term));
  url->setText(query.toSearchUrl().url());

  Soprano::QueryResultIterator it = model->executeQuery(query.toSparqlQuery(), Soprano::Query::QueryLanguageSparql);
  QString text_result;
  while(it.next())
  {
    for (int i=0; i< it.bindingCount(); ++i)
    {
      text_result += it.binding(i).toString();
      text_result += "<br>";
    }
  }

  result->setText(text_result);
}

void moviemanager::queryTag(QString userTag)
{
    //This module is not working
    //get help from pnh for debugging
    //pnh code
    Nepomuk::Tag myTag;
    myTag.setLabel(userTag);
    QString query
       = QString("select distinct ?r where { ?r %1 %2 . ?r a %3 }")
         .arg( Soprano::Node::resourceToN3(Soprano::Vocabulary::NAO::hasTag()) )
         .arg( Soprano::Node::resourceToN3(myTag.resourceUri()) )
         .arg( Soprano::Node::resourceToN3(Nepomuk::Vocabulary::NFO::Video()) );

    QList<Nepomuk::Resource> myResourceList;
    Soprano::Model *model = Nepomuk::ResourceManager::instance()->mainModel();

    Soprano::QueryResultIterator it = model->executeQuery( query, Soprano::Query::QueryLanguageSparql );
    while( it.next() ) {
        qDebug() << "looping";
       myResourceList << Nepomuk::Resource( it.binding( "r" ).uri() );
    }

    Q_FOREACH (const Nepomuk::Resource& r, myResourceList)
    {
        mainMovieList->addItem(r.property(Nepomuk::Vocabulary::NFO::fileName()).toString());
        //if(r.tags().contains(new Nepomuk:Tag("video"))) newList.append(r)
    }

void RemoveDuplicates::loadDuplicates()
{
    Soprano::Model* model = Nepomuk::ResourceManager::instance()->mainModel();
    QString query
       = QString( "select distinct ?u1 where { "
                 "?r1 a %1 . ?r2 a %1. ?r1 %2 ?h. ?r2 %2 ?h. "
                 "?r1 %3 ?u1. ?r2 %3 ?u2. filter(?r1!=?r2) . }order by ?h limit 50")
         .arg( Soprano::Node::resourceToN3(Nepomuk::Vocabulary::NFO::FileDataObject()))
         .arg( Soprano::Node::resourceToN3(Nepomuk::Vocabulary::NFO::hasHash()))
         .arg( Soprano::Node::resourceToN3(Nepomuk::Vocabulary::NIE::url()));

    Soprano::QueryResultIterator it
       = model->executeQuery( query,
                              Soprano::Query::QueryLanguageSparql );
    Nepomuk::File tempRsc;
    while( it.next() ) {
        tempRsc = it.binding("u1").uri() ;
        QString usagecount = QString::number(tempRsc.usageCount());
        QListWidgetItem* item = new QListWidgetItem(tempRsc.genericLabel() + ":: Usage Count:" + usagecount,m_resourceList);
        item->setCheckState(Qt::Unchecked);
        item->setToolTip(tempRsc.url().path());
        qDebug()<<tempRsc.url().path();
    }

}

//
// We don't really care if the indexing level is in the incorrect graph
//
void Nepomuk2::updateIndexingLevel(const QUrl& uri, int level)
{
    QString uriN3 = Soprano::Node::resourceToN3( uri );

    QString query = QString::fromLatin1("select ?g ?l where { graph ?g { %1 kext:indexingLevel ?l . } }")
                    .arg ( uriN3 );
    Soprano::Model* model = ResourceManager::instance()->mainModel();
    Soprano::QueryResultIterator it = model->executeQuery( query, Soprano::Query::QueryLanguageSparqlNoInference );

    QUrl graph;
    Soprano::Node prevLevel;
    if( it.next() ) {
        graph = it[0].uri();
        prevLevel = it[1];
        it.close();
    }

    if( !graph.isEmpty() ) {
        QString graphN3 = Soprano::Node::resourceToN3( graph );
        QString removeCommand = QString::fromLatin1("sparql delete { graph %1 { %2 kext:indexingLevel %3 . } }")
                                .arg( graphN3, uriN3, prevLevel.toN3() );
        model->executeQuery( removeCommand, Soprano::Query::QueryLanguageUser, QLatin1String("sql") );

        QString insertCommand = QString::fromLatin1("sparql insert { graph %1 { %2 kext:indexingLevel %3 . } }")
                                .arg( graphN3, uriN3, Soprano::Node::literalToN3(level) );
        model->executeQuery( insertCommand, Soprano::Query::QueryLanguageUser, QLatin1String("sql") );
    }
    // Practically, this should never happen, but still
    else {
        QScopedPointer<KJob> job( Nepomuk2::setProperty( QList<QUrl>() << uri, KExt::indexingLevel(),
                                                                QVariantList() << QVariant(level) ) );
        job->setAutoDelete(false);
        job->exec();
    }
}

void Nepomuk::ResourceCompletion::makeCompletion( const QString& string )
{
    kDebug() << string;

    if ( string.length() > 3 ) {
        Query::AndTerm term;
        term.addSubTerm( Query::LiteralTerm( string + '*' ) );
        if ( d->type.isValid() && d->type != Soprano::Vocabulary::RDFS::Resource() )
            term.addSubTerm( Query::ResourceTypeTerm( d->type ) );
        Query::Query query(term);
        query.setLimit( 10 );

        kDebug() << query.toSparqlQuery();

        Soprano::QueryResultIterator it
            = ResourceManager::instance()->mainModel()->executeQuery( query.toSparqlQuery(),
                                                                      Soprano::Query::QueryLanguageSparql );
        while ( it.next() ) {
            Resource res( it.binding( 0 ).uri() );
            double score = 1.0; //it[1].literal().toDouble();
            kDebug() << "Match for input" << string << res.uri();
            addCompletion( KCompletionItem( res.genericLabel(),
                                            QString( "%1 (%2)" ).arg( res.genericLabel() ).arg( Types::Class( res.type() ).label() ),
                                            res.genericDescription(),
                                            KIcon( res.genericIcon() ),
                                            score,
                                            res.resourceUri() ) );

        }
    }
}

    /**
     * Get all prefixes stored in the model
     */
    void buildPrefixMap()
    {
        QMutexLocker lock( &m_prefixMapMutex );

        m_prefixes.clear();

        // fixed prefixes
        m_prefixes.insert( "rdf", Soprano::Vocabulary::RDF::rdfNamespace() );
        m_prefixes.insert( "rdfs", Soprano::Vocabulary::RDFS::rdfsNamespace() );
        m_prefixes.insert( "xsd", Soprano::Vocabulary::XMLSchema::xsdNamespace() );
        m_prefixes.insert( "nrl", Soprano::Vocabulary::NRL::nrlNamespace() );
        m_prefixes.insert( "nao", Soprano::Vocabulary::NAO::naoNamespace() );

        // get prefixes from nepomuk
        Soprano::QueryResultIterator it =
            q->executeQuery( QString( "select ?ns ?ab where { "
                                      "?g %1 ?ns . "
                                      "?g %2 ?ab . }" )
                             .arg( Soprano::Node::resourceToN3( Soprano::Vocabulary::NAO::hasDefaultNamespace() ) )
                             .arg( Soprano::Node::resourceToN3( Soprano::Vocabulary::NAO::hasDefaultNamespaceAbbreviation() ) ),
                             Soprano::Query::QueryLanguageSparql );
        while ( it.next() ) {
            QString ab = it["ab"].toString();
            QUrl ns = it["ns"].toString();
            if ( !m_prefixes.contains( ab ) ) {
                m_prefixes.insert( ab, ns );
            }
        }
    }

void KoEventSemanticItemFactory::updateSemanticItems(QList<hKoRdfBasicSemanticItem> &semanticItems, const KoDocumentRdf *rdf, QSharedPointer<Soprano::Model> m)
{
    const QString sparqlQuery = QLatin1String(
        " prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> \n"
        " prefix cal:  <http://www.w3.org/2002/12/cal/icaltzd#>  \n"
        " select distinct ?graph ?ev ?uid ?dtstart ?dtend ?summary ?location ?geo ?long ?lat \n"
        " where {  \n"
        "  GRAPH ?graph { \n"
        "    ?ev rdf:type cal:Vevent . \n"
        "    ?ev cal:uid      ?uid . \n"
        "    ?ev cal:dtstart  ?dtstart . \n"
        "    ?ev cal:dtend    ?dtend \n"
        "    OPTIONAL { ?ev cal:summary  ?summary  } \n"
        "    OPTIONAL { ?ev cal:location ?location } \n"
        "    OPTIONAL {  \n"
        "               ?ev cal:geo ?geo . \n"
        "               ?geo rdf:first ?lat . \n"
       "               ?geo rdf:rest ?joiner . \n"
       "               ?joiner rdf:first ?long \n"
       "              } \n"
       "    } \n"
       "  } \n");

    Soprano::QueryResultIterator it =
        m->executeQuery(sparqlQuery,
                        Soprano::Query::QueryLanguageSparql);

    QList<hKoRdfBasicSemanticItem> oldSemanticItems = semanticItems;
    // uniqfilter is needed because soprano is not honouring
    // the DISTINCT sparql keyword
    QSet<QString> uniqfilter;
    while (it.next()) {
        const QString name = it.binding("uid").toString();
        if (uniqfilter.contains(name)) {
            continue;
        }
        uniqfilter += name;

        hKoRdfBasicSemanticItem newSemanticItem(new KoRdfCalendarEvent(0, rdf, it));

        const QString newSemanticItemLinkingSubject = newSemanticItem->linkingSubject().toString();
        foreach (hKoRdfBasicSemanticItem semItem, oldSemanticItems) {
            if (newSemanticItemLinkingSubject == semItem->linkingSubject().toString()) {
                oldSemanticItems.removeAll(semItem);
                newSemanticItem = 0;
                break;
            }
        }

        if (newSemanticItem) {
            semanticItems << newSemanticItem;
        }
    }

    foreach (hKoRdfBasicSemanticItem semItem, oldSemanticItems) {
        semanticItems.removeAll(semItem);
    }

 void startQuery( const Nepomuk::Query::Query& query ) {
     // we cannot use the query service since that would ignore our custom model
     // thus, we perform a sync query and call _k_newEntries async from there
     Nepomuk::Query::Query ourQuery(query);
     // disable result restrictions since we do not support those in our custom model
     ourQuery.setQueryFlags(Nepomuk::Query::Query::NoResultRestrictions);
     Soprano::QueryResultIterator it = ResourceManager::instance()->mainModel()->executeQuery( ourQuery.toSparqlQuery(), Soprano::Query::QueryLanguageSparql );
     QList<Nepomuk::Query::Result> results;
     while( it.next() ) {
         results << Result( it[0].uri() );
     }
     QMetaObject::invokeMethod( q, "_k_newEntries", Qt::QueuedConnection, Q_ARG(QList<Nepomuk::Query::Result>, results) );
 }

void GraphMigrationJob::mergeAgents()
{
    QString appQ = QString::fromLatin1("select distinct ?i where { ?r a %1 ; %2 ?i . }")
                   .arg( Soprano::Node::resourceToN3(NAO::Agent()),
                         Soprano::Node::resourceToN3(NAO::identifier()) );

    Soprano::QueryResultIterator it = m_model->executeQuery( appQ, Soprano::Query::QueryLanguageSparqlNoInference );
    while( it.next() ) {
        QString identifier = it[0].literal().toString();
        kDebug() << identifier;

        QString aQuery = QString::fromLatin1("select distinct ?r where { ?r a nao:Agent ; nao:identifier %1. }")
                         .arg( Soprano::Node::literalToN3(identifier) );

        Soprano::QueryResultIterator iter = m_model->executeQuery( aQuery, Soprano::Query::QueryLanguageSparqlNoInference );
        QList<QUrl> apps;
        while( iter.next() )
            apps << iter[0].uri();

        mergeAgents( apps );
    }
}

// static
void Nepomuk2::SubtitleLoader::eraseAllSubtitles()
{
    QString query = QString::fromLatin1("select distinct ?r where { ?r a %1 . }")
                    .arg( Soprano::Node::resourceToN3( NSBO::Subtitle() ) );
    kDebug() << query;

    Soprano::Model * model = Nepomuk2::ResourceManager::instance()->mainModel();
    Soprano::QueryResultIterator it = model->executeQuery( query, Soprano::Query::QueryLanguageSparql );
    while( it.next() ) {
        Nepomuk2::Resource res( it["r"].uri() );
        kDebug() << "Removing " << res.uri();
        res.remove();
    }
}

bool Nepomuk::Types::EntityPrivate::load()
{
    const QString query = QString::fromLatin1( "select ?p ?o where { "
                          "graph ?g { <%1> ?p ?o . } . "
                          "{ ?g a %2 . } UNION { ?g a %3 . } . }" )
                          .arg( QString::fromAscii( uri.toEncoded() ),
                                Soprano::Node::resourceToN3( Soprano::Vocabulary::NRL::Ontology() ),
                                Soprano::Node::resourceToN3( Soprano::Vocabulary::NRL::KnowledgeBase() ) );

    Soprano::QueryResultIterator it
        = ResourceManager::instance()->mainModel()->executeQuery( query, Soprano::Query::QueryLanguageSparql );
    while ( it.next() ) {
        QUrl property = it.binding( "p" ).uri();
        Soprano::Node value = it.binding( "o" );

        if ( property == Soprano::Vocabulary::RDFS::label() ) {
            if ( value.language().isEmpty() ) {
                label = value.toString();
            }
            else if( value.language() == KGlobal::locale()->language() ) {
                l10nLabel = value.toString();
            }
        }

        else if ( property == Soprano::Vocabulary::RDFS::comment() ) {
            if ( value.language().isEmpty() ) {
                comment = value.toString();
            }
            else if( value.language() == KGlobal::locale()->language() ) {
                l10nComment = value.toString();
            }
        }

        else if ( property == Soprano::Vocabulary::NAO::hasSymbol() ) {
            icon = KIcon( value.toString() );
        }

        else if ( property == Soprano::Vocabulary::NAO::userVisible() ) {
            userVisible = value.literal().toBool();
        }

        else {
            addProperty( property, value );
        }
    }

    return !it.lastError();
}

QList<Soprano::Statement> Nepomuk::NepomukOntologyLoader::loadOntology( const QUrl& uri )
{
    QList<Soprano::Statement> sl;

    // get the complete named graph describing the ontology
    Soprano::QueryResultIterator it
        = ResourceManager::instance()->mainModel()->executeQuery( QString::fromLatin1( "construct {?s ?p ?o} "
                                                                                       "where { GRAPH %1 { ?s ?p ?o } . }" )
                                                                  .arg( Soprano::Node::resourceToN3(uri) ),
                                                                  Soprano::Query::QueryLanguageSparql );
    while ( it.next() ) {
        sl.append( it.currentStatement() );
    }

    return sl;
}

void Nepomuk::DbpediaAnnotationPlugin::slotQueryFinished( Soprano::Util::AsyncResult* result )
{
    m_currentResult = 0;

    kDebug() << result->lastError();

    Soprano::QueryResultIterator it = result->queryResultIterator();
    while ( it.next() ) {
        kDebug() << it.current();
    }

    // TODO: create annotations either as new pimo things that are related to the resource or as
    //       being the resource (ie. an occurrence of resource().pimoThing())

    emitFinished();
}

void Nepomuk2::TvshowProtocol::stat( const KUrl& url )
{
    // for basic functionality we only need to stat the folders
    const QStringList pathTokens = url.path().split('/', QString::SkipEmptyParts);
    if(pathTokens.count() == 1 && pathTokens.first() == QLatin1String("latest")) {
        KIO::UDSEntry uds = createFolderUDSEntry(QLatin1String("latest"), i18n("Next Episodes To Watch"));
        uds.insert(KIO::UDSEntry::UDS_ICON_NAME, QLatin1String("favorites"));
        statEntry(uds);
        finished();
    }

    else if(pathTokens.count() == 1) {
        // stat series folder
        Soprano::QueryResultIterator it
                = Nepomuk2::ResourceManager::instance()->mainModel()->executeQuery(QString::fromLatin1("select distinct * where { "
                                                                                                      "?r a nmm:TVSeries ; "
                                                                                                      "nie:title %1 ; "
                                                                                                      "nao:created ?cd ; "
                                                                                                      "nao:lastModified ?md ; "
                                                                                                      "nie:description ?d . } LIMIT 1")
                                                                                  .arg(Soprano::Node::literalToN3(pathTokens[0])),
                                                                                  Soprano::Query::QueryLanguageSparql);
        if(it.next()) {
            statEntry(createSeriesUDSEntry(it["r"].uri(),
                                           pathTokens[0],
                                           pathTokens[0],
                                           it["d"].toString(),
                                           it["cd"].literal().toDateTime(),
                                           it["md"].literal().toDateTime()));
            finished();
        }
        else {
            error( ERR_DOES_NOT_EXIST, url.prettyUrl() );
        }
    }

    else if(pathTokens.count() == 2) {
        // stat season folder
        statEntry(createFolderUDSEntry(pathTokens[0], pathTokens[1]));
        finished();
    }

    else {
        // FIXME
        error( ERR_UNSUPPORTED_ACTION, url.prettyUrl() );
    }
}

bool Nepomuk::Types::EntityPrivate::loadAncestors()
{
    const QString query = QString::fromLatin1( "select ?s ?p where { "
                          "graph ?g { ?s ?p <%1> . } . "
                          "{ ?g a %2 . } UNION { ?g a %3 . } . }" )
                          .arg( QString::fromAscii( uri.toEncoded() ),
                                Soprano::Node::resourceToN3( Soprano::Vocabulary::NRL::Ontology() ),
                                Soprano::Node::resourceToN3( Soprano::Vocabulary::NRL::KnowledgeBase() ) );

    Soprano::QueryResultIterator it
        = ResourceManager::instance()->mainModel()->executeQuery( query, Soprano::Query::QueryLanguageSparql );
    while ( it.next() ) {
        addAncestorProperty( it.binding( "s" ).uri(), it.binding( "p" ).uri() );
    }

    return !it.lastError();
}