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NepomukDaemons

ontologyloader.cpp

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00001 /* This file is part of the KDE Project
00002    Copyright (c) 2007 Sebastian Trueg <trueg@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License version 2 as published by the Free Software Foundation.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public License
00014    along with this library; see the file COPYING.LIB.  If not, write to
00015    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00016    Boston, MA 02110-1301, USA.
00017 */
00018 
00019 #include "ontologyloader.h"
00020 #include "ontologymanagermodel.h"
00021 #include "ontologymanageradaptor.h"
00022 #include "graphretriever.h"
00023 
00024 #include <Soprano/Global>
00025 #include <Soprano/Node>
00026 #include <Soprano/Model>
00027 #include <Soprano/PluginManager>
00028 #include <Soprano/StatementIterator>
00029 #include <Soprano/Parser>
00030 
00031 #include <KDesktopFile>
00032 #include <KConfigGroup>
00033 #include <KDebug>
00034 #include <KGlobal>
00035 #include <KStandardDirs>
00036 #include <KLocale>
00037 #include <KDirWatch>
00038 
00039 #include <QtCore/QFileInfo>
00040 #include <QtCore/QTimer>
00041 
00042 #include <kpluginfactory.h>
00043 #include <kpluginloader.h>
00044 
00045 NEPOMUK_EXPORT_SERVICE( Nepomuk::OntologyLoader, "nepomukontologyloader")
00046 
00047 
00048 using namespace Soprano;
00049 
00050 class Nepomuk::OntologyLoader::Private
00051 {
00052 public:
00053     Private( OntologyLoader* p )
00054         : forceOntologyUpdate( false ),
00055           q( p ) {
00056     }
00057 
00058     OntologyManagerModel* model;
00059 
00060     QTimer updateTimer;
00061     bool forceOntologyUpdate;
00062     QStringList desktopFilesToUpdate;
00063 
00064     void updateOntology( const QString& filename );
00065 
00066 private:
00067     OntologyLoader* q;
00068 };
00069 
00070 
00071 void Nepomuk::OntologyLoader::Private::updateOntology( const QString& filename )
00072 {
00073     KDesktopFile df( filename );
00074 
00075     // only update if the modification date of the ontology file changed (not the desktop file).
00076     // ------------------------------------
00077     QFileInfo ontoFileInf( df.readPath() );
00078     QDateTime ontoLastModified = model->ontoModificationDate( df.readUrl() );
00079     bool update = false;
00080 
00081     if ( ontoLastModified < ontoFileInf.lastModified() ) {
00082         kDebug() << "Ontology" << df.readUrl() << "needs updating.";
00083         update = true;
00084     }
00085     else {
00086         kDebug() << "Ontology" << df.readUrl() << "up to date.";
00087     }
00088 
00089     if( !update && forceOntologyUpdate ) {
00090         kDebug() << "Ontology update forced.";
00091         update = true;
00092     }
00093 
00094     if( update ) {
00095         QString mimeType = df.desktopGroup().readEntry( "MimeType", QString() );
00096 
00097         const Soprano::Parser* parser
00098             = Soprano::PluginManager::instance()->discoverParserForSerialization( Soprano::mimeTypeToSerialization( mimeType ),
00099                                                                                   mimeType );
00100         if ( !parser ) {
00101             kDebug() << "No parser to handle" << df.readName() << "(" << mimeType << ")";
00102             return;
00103         }
00104 
00105         kDebug() << "Parsing" << df.readPath();
00106 
00107         Soprano::StatementIterator it = parser->parseFile( df.readPath(),
00108                                                            df.readUrl(),
00109                                                            Soprano::mimeTypeToSerialization( mimeType ),
00110                                                            mimeType );
00111         if ( !parser->lastError() ) {
00112             model->updateOntology( it, df.readUrl() );
00113             emit q->ontologyUpdated( df.readUrl() );
00114         }
00115         else {
00116             emit q->ontologyUpdateFailed( df.readUrl(), i18n( "Parsing of file %1 failed (%2)", df.readPath(), parser->lastError().message() ) );
00117         }
00118     }
00119 }
00120 
00121 
00122 
00123 Nepomuk::OntologyLoader::OntologyLoader( QObject* parent, const QList<QVariant>& )
00124     : Service( parent ),
00125       d( new Private(this) )
00126 {
00127     ( void )new OntologyManagerAdaptor( this );
00128 
00129     d->model = new OntologyManagerModel( mainModel(), this );
00130     connect( &d->updateTimer, SIGNAL(timeout()), this, SLOT(updateNextOntology()) );
00131 
00132     // only update changed ontologies
00133     updateLocalOntologies();
00134 
00135     // watch both the global and local ontology folder for changes
00136     KDirWatch* dirWatch = KDirWatch::self();
00137     connect( dirWatch, SIGNAL( dirty(QString) ),
00138              this, SLOT( updateLocalOntologies() ) );
00139     connect( dirWatch, SIGNAL( created(QString) ),
00140              this, SLOT( updateLocalOntologies() ) );
00141     foreach( const QString& dir, KGlobal::dirs()->findDirs( "data", QString() ) ) {
00142         // we only add the suffix here to make sure to also watch the non-existing local dir
00143         kDebug() << "watching" << ( dir + "nepomuk/ontologies/" );
00144         dirWatch->addDir( dir + "nepomuk/ontologies/", KDirWatch::WatchFiles );
00145     }
00146 }
00147 
00148 
00149 Nepomuk::OntologyLoader::~OntologyLoader()
00150 {
00151     delete d;
00152 }
00153 
00154 
00155 void Nepomuk::OntologyLoader::updateLocalOntologies()
00156 {
00157     d->desktopFilesToUpdate = KGlobal::dirs()->findAllResources( "data", "nepomuk/ontologies/*.desktop" );
00158     d->updateTimer.start(0);
00159 }
00160 
00161 
00162 void Nepomuk::OntologyLoader::updateAllLocalOntologies()
00163 {
00164     d->forceOntologyUpdate = true;
00165     updateLocalOntologies();
00166 }
00167 
00168 
00169 void Nepomuk::OntologyLoader::updateNextOntology()
00170 {
00171     if( !d->desktopFilesToUpdate.isEmpty() ) {
00172         d->updateOntology( d->desktopFilesToUpdate.takeFirst() );
00173     }
00174     else {
00175         d->forceOntologyUpdate = false;
00176         d->updateTimer.stop();
00177     }
00178 }
00179 
00180 
00181 QString Nepomuk::OntologyLoader::findOntologyContext( const QString& uri )
00182 {
00183     return QString::fromAscii( d->model->findOntologyContext( QUrl::fromEncoded( uri.toAscii() ) ).toEncoded() );
00184 }
00185 
00186 
00187 void Nepomuk::OntologyLoader::importOntology( const QString& url )
00188 {
00189     connect( GraphRetriever::retrieve( url ), SIGNAL( result( KJob* ) ),
00190              this, SLOT( slotGraphRetrieverResult( KJob* ) ) );
00191 }
00192 
00193 
00194 void Nepomuk::OntologyLoader::slotGraphRetrieverResult( KJob* job )
00195 {
00196     GraphRetriever* graphRetriever = static_cast<GraphRetriever*>( job );
00197     if ( job->error() ) {
00198         emit ontologyUpdateFailed( QString::fromAscii( graphRetriever->url().toEncoded() ), graphRetriever->errorString() );
00199     }
00200     else {
00201         // TODO: find a way to check if the imported version of the ontology
00202         // is newer than the already installed one
00203         if ( d->model->updateOntology( graphRetriever->statements(), graphRetriever->url() ) ) {
00204             emit ontologyUpdated( QString::fromAscii( graphRetriever->url().toEncoded() ) );
00205         }
00206         else {
00207             emit ontologyUpdateFailed( QString::fromAscii( graphRetriever->url().toEncoded() ), d->model->lastError().message() );
00208         }
00209     }
00210 }
00211 
00212 #include "ontologyloader.moc"

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