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 #include <QTime>
  32
  33 struct KNepomukRolesProviderSingleton
  34 {
  35     KNepomukRolesProvider instance;
  36 };
  37 K_GLOBAL_STATIC(KNepomukRolesProviderSingleton, s_nepomukRolesProvider)
  38
  39
  40 KNepomukRolesProvider& KNepomukRolesProvider::instance()
  41 {
  42     return s_nepomukRolesProvider->instance;
  43 }
  44
  45 KNepomukRolesProvider::~KNepomukRolesProvider()
  46 {
  47 }
  48
  49 QSet<QByteArray> KNepomukRolesProvider::roles() const
  50 {
  51     return m_roles;
  52 }
  53
  54 QHash<QByteArray, QVariant> KNepomukRolesProvider::roleValues(const Nepomuk::Resource& resource,
  55                                                               const QSet<QByteArray>& roles) const
  56 {
  57     if (!resource.isValid()) {
  58         return QHash<QByteArray, QVariant>();
  59     }
  60
  61     QHash<QByteArray, QVariant> values;
  62
  63     int width = -1;
  64     int height = -1;
  65
  66     QHashIterator<QUrl, Nepomuk::Variant> it(resource.properties());
  67     while (it.hasNext()) {
  68         it.next();
  69
  70         const Nepomuk::Types::Property property = it.key();
  71         const QByteArray role = m_roleForUri.value(property.uri());
  72         if (role.isEmpty() || !roles.contains(role)) {
  73             continue;
  74         }
  75
  76         const Nepomuk::Variant value = it.value();
  77
  78         if (role == "imageSize") {
  79             // Merge the two Nepomuk properties for width and height
  80             // as one string into the "imageSize" role
  81             const QString uri = property.uri().toString();
  82             if (uri.endsWith("#width")) {
  83                 width = value.toInt();
  84             } else if (uri.endsWith("#height")) {
  85                 height = value.toInt();
  86             }
  87
  88             if (width >= 0 && height >= 0) {
  89                 const QString widthAndHeight = QString::number(width) +
  90                                                QLatin1String(" x ") +
  91                                                QString::number(height);
  92                 values.insert(role, widthAndHeight);
  93             }
  94         } else if (role == "tags") {
  95             const QString tags = tagsFromValues(value.toStringList());
  96             values.insert(role, tags);
  97         } else if (role == "orientation") {
  98             const QString orientation = orientationFromValue(value.toInt());
  99             values.insert(role, orientation);
 100         } else if (role == "duration") {
 101             const QString duration = durationFromValue(value.toInt());
 102             values.insert(role, duration);
 103         } else if (value.isResource()) {
 104             const Nepomuk::Resource resource = value.toResource();
 105             values.insert(role, resource.genericLabel());
 106         } else {
 107             values.insert(role, value.toString());
 108         }
 109     }
 110
 111     // Assure that empty values get replaced by "-"
 112     foreach (const QByteArray& role, roles) {
 113         if (m_roles.contains(role) && values.value(role).toString().isEmpty()) {
 114             values.insert(role, QLatin1String("-"));
 115         }
 116     }
 117
 118     return values;
 119 }
 120
 121 KNepomukRolesProvider::KNepomukRolesProvider() :
 122     m_roles(),
 123     m_roleForUri()
 124 {
 125     struct UriInfo
 126     {
 127         const char* const uri;
 128         const char* const role;
 129     };
 130
 131     // Mapping from the URIs to the KFileItemModel roles. Note that this must not be
 132     // a 1:1 mapping: One role may contain several URI-values (e.g. the URIs for height and
 133     // width of an image are mapped to the role "imageSize")
 134     static const UriInfo uriInfoList[] = {
 135         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#numericRating", "rating" },
 136         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#hasTag",        "tags" },
 137         { "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#description",   "comment" },
 138         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#wordCount",     "wordCount" },
 139         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#lineCount",     "lineCount" },
 140         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#width",         "imageSize" },
 141         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#height",        "imageSize" },
 142         { "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#orientation", "orientation", },
 143         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#performer",     "artist" },
 144         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#musicAlbum",    "album" },
 145         { "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#duration",      "duration" },
 146         { "http://www.semanticdesktop.org/ontologies/2009/02/19/nmm#trackNumber",   "track" },
 147         { "http://www.semanticdesktop.org/ontologies/2010/04/30/ndo#copiedFrom",    "copiedFrom" }
 148     };
 149
 150     for (unsigned int i = 0; i < sizeof(uriInfoList) / sizeof(UriInfo); ++i) {
 151         m_roleForUri.insert(QUrl(uriInfoList[i].uri), uriInfoList[i].role);
 152         m_roles.insert(uriInfoList[i].role);
 153     }
 154 }
 155
 156 QString KNepomukRolesProvider::tagsFromValues(const QStringList& values) const
 157 {
 158     QString tags;
 159
 160     for (int i = 0; i < values.count(); ++i) {
 161         if (i > 0) {
 162             tags.append(QLatin1String(", "));
 163         }
 164
 165         const Nepomuk::Tag tag(values[i]);
 166         tags += tag.genericLabel();
 167     }
 168
 169     return tags;
 170 }
 171
 172 QString KNepomukRolesProvider::orientationFromValue(int value) const
 173 {
 174     QString string;
 175     switch (value) {
 176     case 1: string = i18nc("@item:intable Image orientation", "Unchanged"); break;
 177     case 2: string = i18nc("@item:intable Image orientation", "Horizontally flipped"); break;
 178     case 3: string = i18nc("@item:intable image orientation", "180° rotated"); break;
 179     case 4: string = i18nc("@item:intable image orientation", "Vertically flipped"); break;
 180     case 5: string = i18nc("@item:intable image orientation", "Transposed"); break;
 181     case 6: string = i18nc("@item:intable image orientation", "90° rotated"); break;
 182     case 7: string = i18nc("@item:intable image orientation", "Transversed"); break;
 183     case 8: string = i18nc("@item:intable image orientation", "270° rotated"); break;
 184     default:
 185         break;
 186     }
 187     return string;
 188 }
 189
 190 QString KNepomukRolesProvider::durationFromValue(int value) const
 191 {
 192     QTime duration;
 193     duration = duration.addMSecs(value);
 194     return duration.toString("hh:mm:ss");
 195 }
 196