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92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/**
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* Copyright (C) 2002-2004 Scott Wheeler <wheeler@kde.org>
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* Copyright (C) 2008, 2013 Michael Pyne <mpyne@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef JUK_CACHE_H
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#define JUK_CACHE_H
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#include <QtCore/QDataStream>
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#include <QtCore/QFile>
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#include <QtCore/QBuffer>
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class Playlist;
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class PlaylistCollection;
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class FileHandle;
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template<class T>
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class QList;
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typedef QList<Playlist *> PlaylistList;
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/**
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* A simple QDataStream subclass that has an extra field to indicate the cache
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* version.
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*/
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class CacheDataStream : public QDataStream
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{
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public:
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CacheDataStream(QIODevice *d) : QDataStream(d), m_cacheVersion(0) {}
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CacheDataStream() : m_cacheVersion(0) { }
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int cacheVersion() const { return m_cacheVersion; }
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void setCacheVersion(int v) { m_cacheVersion = v; }
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private:
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int m_cacheVersion;
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};
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class Cache
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{
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public:
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static Cache *instance();
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static void loadPlaylists(PlaylistCollection *collection);
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static void savePlaylists(const PlaylistList &playlists);
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static bool cacheFileExists();
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bool prepareToLoadCachedItems();
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FileHandle loadNextCachedItem();
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/**
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* QDataStream version for serialized list of playlists
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* 1, 2: Who knows?
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* 3: Current.
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*/
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static const int playlistListCacheVersion;
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/**
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* QDataStream version for serialized list of playlist items in a playlist
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* 1: Original cache version
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* 2: KDE 4.0.1+, explicitly sets QDataStream encoding.
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*/
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static const int playlistItemsCacheVersion;
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private:
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// private to force access through instance()
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Cache();
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private:
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QFile m_loadFile;
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QBuffer m_loadFileBuffer;
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CacheDataStream m_loadDataStream;
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};
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#endif
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// vim: set et sw=4 tw=0 sta:
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