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