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/****************************************************************************
**
** Definition of QGCache and QGCacheIterator classes
**
** Created : 950208
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial 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 WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#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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