Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdemultimedia@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 67 insertions, 0 deletions

diff --git a/juk/cache.h b/juk/cache.h
new file mode 100644
index 00000000..09f6906d
--- /dev/null
+++ b/juk/cache.h
@@ -0,0 +1,67 @@
+/***************************************************************************
+    begin                : Sat Sep 7 2002
+    copyright            : (C) 2002 - 2004 by Scott Wheeler
+    email                : wheeler@kde.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef CACHE_H
+#define CACHE_H
+
+
+#include "stringhash.h"
+
+class Tag;
+class Playlist;
+class PlaylistCollection;
+
+typedef QValueList<Playlist *> PlaylistList;
+
+class Cache : public FileHandleHash
+{
+public:
+    static Cache *instance();
+    void save();
+
+    static void loadPlaylists(PlaylistCollection *collection);
+    static void savePlaylists(const PlaylistList &playlists);
+
+    static bool cacheFileExists();
+
+protected:
+    Cache();
+    void load();
+
+private:
+    static const int m_currentVersion = 1;
+};
+
+/**
+ * A simple QDataStream subclass that has an extra field to indicate the cache
+ * version.
+ */
+
+class CacheDataStream : public QDataStream
+{
+public:
+    CacheDataStream(QIODevice *d) : QDataStream(d), m_cacheVersion(0) {}
+    CacheDataStream(QByteArray a, int mode) : QDataStream(a, mode), m_cacheVersion(0) {}
+
+    virtual ~CacheDataStream() {}
+
+    int cacheVersion() const { return m_cacheVersion; }
+    void setCacheVersion(int v) { m_cacheVersion = v; }
+    
+private:
+    int m_cacheVersion;
+};
+
+#endif