src/kitemviews/private/kbaloorolesprovider.h

   1 /***************************************************************************
   2  *   Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com>             *
   3  *   Copyright (C) 2013 by Vishesh Handa <me@vhanda.in>                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #ifndef KBALOO_ROLESPROVIDER_H
  22 #define KBALOO_ROLESPROVIDER_H
  23
  24 #include "dolphin_export.h"
  25
  26 #include <QHash>
  27 #include <QSet>
  28 #include <QVariant>
  29
  30 namespace Baloo {
  31     class File;
  32 }
  33
  34 /**
  35  * @brief Allows accessing metadata of a file by providing KFileItemModel roles.
  36  *
  37  * Is a helper class for KFileItemModelRolesUpdater to retrieve roles that
  38  * are only accessible with Baloo.
  39  */
  40 class DOLPHIN_EXPORT KBalooRolesProvider
  41 {
  42 public:
  43     static KBalooRolesProvider& instance();
  44     virtual ~KBalooRolesProvider();
  45
  46     /**
  47      * @return Roles that can be provided by KBalooRolesProvider.
  48      */
  49     QSet<QByteArray> roles() const;
  50
  51     /**
  52      * @return Values for the roles \a roles that can be determined from the file
  53      *         with the URL \a url.
  54      */
  55     QHash<QByteArray, QVariant> roleValues(const Baloo::File& file,
  56                                            const QSet<QByteArray>& roles) const;
  57
  58     QByteArray roleForProperty(const QString& property) const;
  59
  60 protected:
  61     KBalooRolesProvider();
  62
  63 private:
  64     /**
  65      * @return User visible string for the given tag-values.
  66      *         The tag-values are sorted in alphabetical order.
  67      */
  68     QString tagsFromValues(const QStringList& values) const;
  69
  70     /**
  71      * @return User visible string for the EXIF-orientation property
  72      *         which can have the values 0 to 8.
  73      *         (see http://sylvana.net/jpegcrop/exif_orientation.html)
  74      */
  75     QString orientationFromValue(int value) const;
  76
  77     /**
  78      * @return Duration in the format HH::MM::SS for the value given
  79      *         in seconds.
  80      */
  81     QString durationFromValue(int value) const;
  82
  83     /**
  84      * @return Bitrate in the format N kB/s for the value given
  85      *         in b/s.
  86      */
  87     QString bitrateFromValue(int value) const;
  88
  89 private:
  90     QSet<QByteArray> m_roles;
  91     QHash<QString, QByteArray> m_roleForProperty;
  92
  93     friend struct KBalooRolesProviderSingleton;
  94 };
  95
  96 #endif
  97