runtime/nepomuk/strigibackend/util.cpp

   1 /*
   2    $Id: sourceheader 511311 2006-02-19 14:51:05Z trueg $
   3
   4    This file is part of the Strigi project.
   5    Copyright (C) 2007 Sebastian Trueg <trueg@kde.org>
   6
   7    This library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2 of
  10    the License, or (at your option) any later version.
  11
  12    This library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this library; see the file COPYING.  If not, write to
  19    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.
  21 */
  22
  23 #include "util.h"
  24
  25 #include <strigi/variant.h>
  26 #include <strigi/fieldtypes.h>
  27
  28 #include <QtCore/QUrl>
  29 #include <QtCore/QFile>
  30 #include <QtCore/QFileInfo>
  31 #include <QtCore/QUuid>
  32 #include <QtCore/QDebug>
  33
  34 #include <Soprano/Index/CLuceneIndex>
  35 #include <Soprano/Model>
  36 #include <Soprano/Vocabulary/RDF>
  37
  38
  39 #define STRIGI_NS "http://www.strigi.org/data#"
  40
  41 QUrl Strigi::Soprano::Util::fieldUri( const std::string& s )
  42 {
  43     QString qKey = QString::fromUtf8( s.c_str() );
  44     QUrl url;
  45
  46     // very naive test for proper URI
  47     if ( qKey.contains( ":/" ) ) {
  48         url = qKey;
  49     }
  50     else {
  51         url = STRIGI_NS + qKey;
  52     }
  53
  54     // just to be sure
  55     if ( url.isRelative() ) {
  56         url.setScheme( "http" );
  57     }
  58
  59     return url;
  60 }
  61
  62
  63 QUrl Strigi::Soprano::Util::fileUrl( const std::string& filename )
  64 {
  65     QUrl url = QUrl::fromLocalFile( QFileInfo( QString::fromUtf8( filename.c_str() ) ).absoluteFilePath() );
  66     url.setScheme( "file" );
  67     return url;
  68 }
  69
  70
  71 std::string Strigi::Soprano::Util::fieldName( const QUrl& uri )
  72 {
  73     QString s = uri.toString();
  74     if ( s.startsWith( STRIGI_NS ) ) {
  75         s = s.mid( strlen( STRIGI_NS ) );
  76     }
  77     return s.toUtf8().data();
  78 }
  79
  80
  81 TString Strigi::Soprano::Util::convertSearchField( const std::string& field )
  82 {
  83     if ( QString::fromUtf8( field.c_str() ) == ::Soprano::Index::CLuceneIndex::defaultSearchField() ) {
  84         return TString::fromUtf8( field.c_str() );
  85     }
  86     else if ( QString( field.c_str() ) == ::Soprano::Vocabulary::RDF::type().toString() ) {
  87         // see sopranoindexwriter:addValue for details in this conversion
  88         return TString( "http://strigi.sourceforge.net/fields#rdf-string-type" );
  89     }
  90     else {
  91         return fieldUri( field ).toString();
  92     }
  93 }
  94
  95
  96 QUrl Strigi::Soprano::Util::uniqueUri( const QString& ns, ::Soprano::Model* model )
  97 {
  98     QUrl uri;
  99     do {
 100         QString uid = QUuid::createUuid().toString();
 101         uri = ( ns + uid.mid( 1, uid.length()-2 ) );
 102     } while ( model->containsAnyStatement( ::Soprano::Statement( uri, ::Soprano::Node(), ::Soprano::Node() ) ) );
 103     return uri;
 104 }
 105
 106
 107 Strigi::Variant Strigi::Soprano::Util::nodeToVariant( const ::Soprano::Node& node )
 108 {
 109     if ( node.isLiteral() ) {
 110         switch( node.literal().type() ) {
 111         case QVariant::Int:
 112         case QVariant::UInt:
 113         case QVariant::LongLong:  // FIXME: no perfect conversion :(
 114         case QVariant::ULongLong:
 115             return Strigi::Variant( node.literal().toInt() );
 116
 117         case QVariant::Bool:
 118             return Strigi::Variant( node.literal().toBool() );
 119
 120         default:
 121             return Strigi::Variant( node.literal().toString().toUtf8().data() );
 122         }
 123     }
 124     else {
 125         qWarning() << "(Soprano::Util::nodeToVariant) cannot convert non-literal node to variant.";
 126         return Strigi::Variant();
 127     }
 128 }