src/kitemviews/private/knepomukrolesprovider.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "knepomukrolesprovider.h"
  21
  22 #include <KDebug>
  23 #include <KGlobal>
  24 #include <KLocale>
  25
  26 #include <Nepomuk/Resource>
  27 #include <Nepomuk/Tag>
  28 #include <Nepomuk/Types/Property>
  29 #include <Nepomuk/Variant>
  30
  31 struct KNepomukRolesProviderSingleton
  32 {
  33     KNepomukRolesProvider instance;
  34 };
  35 K_GLOBAL_STATIC(KNepomukRolesProviderSingleton, s_nepomukRolesProvider)
  36
  37
  38 KNepomukRolesProvider& KNepomukRolesProvider::instance()
  39 {
  40     return s_nepomukRolesProvider->instance;
  41 }
  42
  43 KNepomukRolesProvider::~KNepomukRolesProvider()
  44 {
  45 }
  46
  47 QSet<QByteArray> KNepomukRolesProvider::roles() const
  48 {
  49     return m_roles;
  50 }
  51
  52 QHash<QByteArray, QVariant> KNepomukRolesProvider::roleValues(const Nepomuk::Resource& resource,
  53                                                               const QSet<QByteArray>& roles) const
  54 {
  55     if (!resource.isValid()) {
  56         return QHash<QByteArray, QVariant>();
  57     }
  58
  59     QHash<QByteArray, QVariant> values;
  60
  61     int width = -1;
  62     int height = -1;
  63
  64     QHashIterator<QUrl, Nepomuk::Variant> it(resource.properties());
  65     while (it.hasNext()) {
  66         it.next();
  67
  68         const Nepomuk::Types::Property property = it.key();
  69         const QByteArray role = m_roleForUri.value(property.uri());
  70         if (role.isEmpty() || !roles.contains(role)) {
  71             continue;
  72         }
  73
  74         const Nepomuk::Variant value = it.value();
  75
  76         if (role == "imageSize") {
  77             // Merge the two Nepomuk properties for width and height
  78             // as one string into the "imageSize" role
  79             const QString uri = property.uri().toString();
  80             if (uri.endsWith("#width")) {
  81                 width = value.toInt();
  82             } else if (uri.endsWith("#height")) {
  83                 height = value.toInt();
  84             }
  85
  86             if (width >= 0 && height >= 0) {
  87                 const QString widthAndHeight = QString::number(width) +
  88                                                QLatin1String(" x ") +
  89                                                QString::number(height);
  90                 values.insert(role, widthAndHeight);
  91             }
  92         } else if (role == "tags") {
  93             const QString tags = tagsFromValues(value.toStringList());
  94             values.insert(role, tags);
  95         } else if (role == "orientation") {
  96             const QString orientation = orientationFromValue(value.toInt());
  97             values.insert(role, orientation);
  98         } else if (value.isResource()) {
  99             const Nepomuk::Resource resource = value.toResource();
 100             values.insert(role, resource.genericLabel());
 101         } else {
 102             values.insert(role, value.toString());
 103         }
 104     }
 105
 106     // Assure that empty values get replaced by "-"
 107     foreach (const QByteArray& role, roles) {
 108         if (m_roles.contains(role) && values.value(role).toString().isEmpty()) {
 109             values.insert(role, QLatin1String("-"));
 110         }
 111     }
 112
 113     return values;
 114 }
 115
 116 KNepomukRolesProvider::KNepomukRolesProvider() :
 117     m_roles(),
 118     m_roleForUri()
 119 {
 120     struct UriInfo
 121     {
 122         const char* const uri;
 123         const char* const role;
 124     };
 125
 126     // Mapping from the URIs to the KFileItemModel roles. Note that this must not be
 127     // a 1:1 mapping: One role may contain several URI-values (e.g. the URIs for height and
 128     // width of an image are mapped to the role "imageSize")
 129     static const UriInfo uriInfoList[] = {
 130         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#numericRating", "rating" },
 131         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#hasTag",        "tags" },
 132         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#description",   "comment" },
 133         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#wordCount",     "wordCount" },
 134         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#lineCount",     "lineCount" },
 135         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#width",         "imageSize" },
 136         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#height",        "imageSize" },
 137         { "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#orientation", "orientation", },
 138         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#performer",     "artist" },
 139         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#musicAlbum",    "album" },
 140         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#duration",      "duration" },
 141         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#trackNumber",   "track" },
 142         { "http://www.semanticdesktop.org/ontologies/2010/04/30/ndo#copiedFrom",    "copiedFrom" }
 143     };
 144
 145     for (unsigned int i = 0; i < sizeof(uriInfoList) / sizeof(UriInfo); ++i) {
 146         m_roleForUri.insert(QUrl(uriInfoList[i].uri), uriInfoList[i].role);
 147         m_roles.insert(uriInfoList[i].role);
 148     }
 149 }
 150
 151 QString KNepomukRolesProvider::tagsFromValues(const QStringList& values) const
 152 {
 153     QString tags;
 154
 155     for (int i = 0; i < values.count(); ++i) {
 156         if (i > 0) {
 157             tags.append(QLatin1String(", "));
 158         }
 159
 160         const Nepomuk::Tag tag(values[i]);
 161         tags += tag.genericLabel();
 162     }
 163
 164     return tags;
 165 }
 166
 167 QString KNepomukRolesProvider::orientationFromValue(int value) const
 168 {
 169     QString string;
 170     switch (value) {
 171     case 1: string = i18nc("@item:intable Image orientation", "Unchanged"); break;
 172     case 2: string = i18nc("@item:intable Image orientation", "Horizontally flipped"); break;
 173     case 3: string = i18nc("@item:intable image orientation", "180° rotated"); break;
 174     case 4: string = i18nc("@item:intable image orientation", "Vertically flipped"); break;
 175     case 5: string = i18nc("@item:intable image orientation", "Transposed"); break;
 176     case 6: string = i18nc("@item:intable image orientation", "90° rotated"); break;
 177     case 7: string = i18nc("@item:intable image orientation", "Transversed"); break;
 178     case 8: string = i18nc("@item:intable image orientation", "270° rotated"); break;
 179     default:
 180         break;
 181     }
 182     return string;
 183 }
 184