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/***************************************************************************
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 TQValueList<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 TQDataStream subclass that has an extra field to indicate the cache
* version.
*/
class CacheDataStream : public QDataStream
{
public:
CacheDataStream(TQIODevice *d) : TQDataStream(d), m_cacheVersion(0) {}
CacheDataStream(TQByteArray a, int mode) : TQDataStream(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
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