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/****************************************************************************
** $Id$
**
** Definition of QGCache and QGCacheIterator classes
**
** Created : 950208
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef QGCACHE_H
#define QGCACHE_H
#ifndef QT_H
#include "qptrcollection.h"
#include "qglist.h"
#include "qgdict.h"
#endif // QT_H
class QCList; // internal classes
class QCListIt;
class QCDict;
class Q_EXPORT QGCache : public QPtrCollection // generic LRU cache
{
friend class QGCacheIterator;
protected:
enum KeyType { StringKey, AsciiKey, IntKey, PtrKey };
// identical to QGDict's, but PtrKey is not used at the moment
QGCache( int maxCost, uint size, KeyType kt, bool caseSensitive,
bool copyKeys );
QGCache( const QGCache & ); // not allowed, calls fatal()
~QGCache();
QGCache &operator=( const QGCache & ); // not allowed, calls fatal()
uint count() const;
uint size() const;
int maxCost() const { return mCost; }
int totalCost() const { return tCost; }
void setMaxCost( int maxCost );
void clear();
bool insert_string( const QString &key, QPtrCollection::Item,
int cost, int priority );
bool insert_other( const char *key, QPtrCollection::Item,
int cost, int priority );
bool remove_string( const QString &key );
bool remove_other( const char *key );
QPtrCollection::Item take_string( const QString &key );
QPtrCollection::Item take_other( const char *key );
QPtrCollection::Item find_string( const QString &key, bool ref=TRUE ) const;
QPtrCollection::Item find_other( const char *key, bool ref=TRUE ) const;
void statistics() const;
private:
bool makeRoomFor( int cost, int priority = -1 );
KeyType keytype;
QCList *lruList;
QCDict *dict;
int mCost;
int tCost;
bool copyk;
};
class Q_EXPORT QGCacheIterator // generic cache iterator
{
protected:
QGCacheIterator( const QGCache & );
QGCacheIterator( const QGCacheIterator & );
~QGCacheIterator();
QGCacheIterator &operator=( const QGCacheIterator & );
uint count() const;
bool atFirst() const;
bool atLast() const;
QPtrCollection::Item toFirst();
QPtrCollection::Item toLast();
QPtrCollection::Item get() const;
QString getKeyString() const;
const char *getKeyAscii() const;
long getKeyInt() const;
QPtrCollection::Item operator()();
QPtrCollection::Item operator++();
QPtrCollection::Item operator+=( uint );
QPtrCollection::Item operator--();
QPtrCollection::Item operator-=( uint );
protected:
QCListIt *it; // iterator on cache list
};
#endif // QGCACHE_H
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