src/panels/information/kloadmetadatathread.cpp

   1 /*****************************************************************************
   2  * Copyright (C) 2009-2010 by Peter Penz <peter.penz@gmx.at>                 *
   3  * Copyright (C) 2009 by Sebastian Trueg <trueg@kde.org>                     *
   4  *                                                                           *
   5  * This library is free software; you can redistribute it and/or             *
   6  * modify it under the terms of the GNU Library General Public               *
   7  * License version 2 as published by the Free Software Foundation.           *
   8  *                                                                           *
   9  * This library 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 GNU         *
  12  * Library General Public License for more details.                          *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Library General Public License *
  15  * along with this library; see the file COPYING.LIB.  If not, write to      *
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,      *
  17  * Boston, MA 02110-1301, USA.                                               *
  18  *****************************************************************************/
  19
  20 #include "kloadmetadatathread_p.h"
  21
  22 #include <kconfig.h>
  23 #include <kconfiggroup.h>
  24 #include <kfilemetainfo.h>
  25 #include <kfilemetainfoitem.h>
  26 #include <kglobal.h>
  27 #include <klocale.h>
  28 #include "kmetadatamodel.h"
  29 #include <kprotocolinfo.h>
  30
  31 #include <nepomuk/resource.h>
  32 #include <nepomuk/resourcemanager.h>
  33
  34 KLoadMetaDataThread::KLoadMetaDataThread(KMetaDataModel* model) :
  35     m_model(model),
  36     m_data(),
  37     m_urls(),
  38     m_canceled(false)
  39 {
  40     Q_ASSERT(model != 0);
  41 }
  42
  43 KLoadMetaDataThread::~KLoadMetaDataThread()
  44 {
  45 }
  46
  47 void KLoadMetaDataThread::load(const KUrl::List& urls)
  48 {
  49     m_urls = urls;
  50     m_canceled = false;
  51     start();
  52 }
  53
  54 QMap<KUrl, Nepomuk::Variant> KLoadMetaDataThread::data() const
  55 {
  56     return m_data;
  57 }
  58
  59 void KLoadMetaDataThread::cancel()
  60 {
  61     // Setting m_canceled to true will cancel KLoadMetaDataThread::run()
  62     // as soon as run() gets the chance to check m_cancel.
  63     m_canceled = true;
  64 }
  65
  66 void KLoadMetaDataThread::cancelAndDelete()
  67 {
  68     if (isFinished()) {
  69         Q_ASSERT(!isRunning());
  70         deleteLater();
  71     } else {
  72         connect(this, SIGNAL(finished()), this, SLOT(slotFinished()));
  73         // Setting m_canceled to true will cancel KLoadMetaDataThread::run()
  74         // as soon as run() gets the chance to check m_cancel.
  75         m_canceled = true;
  76         // Afterwards the thread will delete itself
  77         // asynchronously inside slotFinished().
  78     }
  79 }
  80
  81 void KLoadMetaDataThread::run()
  82 {
  83     KConfig config("kmetainformationrc", KConfig::NoGlobals);
  84     KConfigGroup settings = config.group("Show");
  85
  86     unsigned int rating = 0;
  87     QString comment;
  88     QList<Nepomuk::Tag> tags;
  89
  90     bool first = true;
  91     foreach (const KUrl& url, m_urls) {
  92         if (m_canceled) {
  93             return;
  94         }
  95
  96         Nepomuk::Resource file(url);
  97         if (!file.isValid()) {
  98             continue;
  99         }
 100
 101         if (!first && (rating != file.rating())) {
 102             rating = 0; // reset rating
 103         } else if (first) {
 104             rating = file.rating();
 105         }
 106
 107         if (!first && (comment != file.description())) {
 108             comment.clear(); // reset comment
 109         } else if (first) {
 110             comment = file.description();
 111         }
 112
 113         if (!first && (tags != file.tags())) {
 114             tags.clear(); // reset tags
 115         } else if (first) {
 116             tags = file.tags();
 117         }
 118
 119         if (first && (m_urls.count() == 1)) {
 120             // get cached meta data by checking the indexed files
 121             QHash<QUrl, Nepomuk::Variant> variants = file.properties();
 122             QHash<QUrl, Nepomuk::Variant>::const_iterator it = variants.constBegin();
 123             while (it != variants.constEnd()) {
 124                 Nepomuk::Types::Property prop(it.key());
 125                 const QString uriString = prop.uri().toString();
 126                 if (settings.readEntry(uriString, true)) {
 127                     m_data.insert(uriString, formatValue(it.value()));
 128                 }
 129                 ++it;
 130             }
 131
 132             if (variants.isEmpty()) {
 133                 // the file has not been indexed, query the meta data
 134                 // directly from the file
 135                 KFileMetaInfo metaInfo(m_urls.first());
 136                 const QHash<QString, KFileMetaInfoItem> metaInfoItems = metaInfo.items();
 137                 foreach (const KFileMetaInfoItem& metaInfoItem, metaInfoItems) {
 138                     const QString uriString = metaInfoItem.name();
 139                     if (settings.readEntry(uriString, true)) {
 140                         const Nepomuk::Variant value(metaInfoItem.value());
 141                         m_data.insert(uriString, formatValue(value));
 142                     }
 143                 }
 144             }
 145         }
 146
 147         first = false;
 148     }
 149
 150     const bool isNepomukActivated = (Nepomuk::ResourceManager::instance()->init() == 0);
 151     if (isNepomukActivated) {
 152         m_data.insert(KUrl("kfileitem#rating"), rating);
 153         m_data.insert(KUrl("kfileitem#comment"), comment);
 154
 155         QList<Nepomuk::Variant> tagVariants;
 156         foreach (const Nepomuk::Tag& tag, tags) {
 157             tagVariants.append(Nepomuk::Variant(tag));
 158         }
 159         m_data.insert(KUrl("kfileitem#tags"), tagVariants);
 160     }
 161
 162     m_data.unite(m_model->loadData());
 163 }
 164
 165 void KLoadMetaDataThread::slotFinished()
 166 {
 167     deleteLater();
 168 }
 169
 170 QString  KLoadMetaDataThread::formatValue(const Nepomuk::Variant& value)
 171 {
 172     if (value.isDateTime()) {
 173         return KGlobal::locale()->formatDateTime(value.toDateTime(), KLocale::FancyLongDate);
 174     }
 175
 176     if (value.isResource() || value.isResourceList()) {
 177         QStringList links;
 178         foreach(const Nepomuk::Resource& res, value.toResourceList()) {
 179             if (KProtocolInfo::isKnownProtocol(res.resourceUri())) {
 180                 links << QString::fromLatin1("<a href=\"%1\">%2</a>")
 181                          .arg(KUrl(res.resourceUri()).url())
 182                          .arg(res.genericLabel());
 183             } else {
 184                 links << res.genericLabel();
 185             }
 186         }
 187         return links.join(QLatin1String(";\n"));
 188     }
 189
 190     return value.toString();
 191 }
 192
 193 #include "kloadmetadatathread_p.moc"