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q3gcache.h

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#ifndef Q3GCACHE_H
#define Q3GCACHE_H

#include <Qt3Support/q3ptrcollection.h>
#include <Qt3Support/q3glist.h>
#include <Qt3Support/q3gdict.h>

QT_BEGIN_HEADER

QT_MODULE(Qt3SupportLight)

class Q3CList;                            // internal classes
class Q3CListIt;
class Q3CDict;

00039 class Q_COMPAT_EXPORT Q3GCache : public Q3PtrCollection     // generic LRU cache
{
friend class Q3GCacheIterator;
protected:
    enum KeyType { StringKey, AsciiKey, IntKey, PtrKey };
      // identical to Q3GDict's, but PtrKey is not used at the moment

    Q3GCache(int maxCost, uint size, KeyType kt, bool caseSensitive,
           bool copyKeys);
    Q3GCache(const Q3GCache &);                 // not allowed, calls fatal()
   ~Q3GCache();
    Q3GCache &operator=(const Q3GCache &);      // not allowed, calls fatal()

    uint    count()     const;
    uint    size()      const;
00054     int         maxCost()     const { return mCost; }
00055     int         totalCost() const   { return tCost; }
    void    setMaxCost(int maxCost);
    void    clear();

    bool    insert_string(const QString &key, Q3PtrCollection::Item,
                     int cost, int priority);
    bool    insert_other(const char *key, Q3PtrCollection::Item,
                    int cost, int priority);
    bool    remove_string(const QString &key);
    bool    remove_other(const char *key);
    Q3PtrCollection::Item take_string(const QString &key);
    Q3PtrCollection::Item take_other(const char *key);

    Q3PtrCollection::Item find_string(const QString &key, bool ref=true) const;
    Q3PtrCollection::Item find_other(const char *key, bool ref=true) const;

    void    statistics() const;

private:
    bool    makeRoomFor(int cost, int priority = -1);
    KeyType keytype;
    Q3CList *lruList;
    Q3CDict *dict;
    int         mCost;
    int         tCost;
    bool    copyk;
};


00084 class Q_COMPAT_EXPORT Q3GCacheIterator                // generic cache iterator
{
protected:
    Q3GCacheIterator(const Q3GCache &);
    Q3GCacheIterator(const Q3GCacheIterator &);
   ~Q3GCacheIterator();
    Q3GCacheIterator &operator=(const Q3GCacheIterator &);

    uint          count()   const;
    bool          atFirst() const;
    bool          atLast()  const;
    Q3PtrCollection::Item toFirst();
    Q3PtrCollection::Item toLast();

    Q3PtrCollection::Item get() const;
    QString       getKeyString() const;
    const char       *getKeyAscii()  const;
    long          getKeyInt()    const;

    Q3PtrCollection::Item operator()();
    Q3PtrCollection::Item operator++();
    Q3PtrCollection::Item operator+=(uint);
    Q3PtrCollection::Item operator--();
    Q3PtrCollection::Item operator-=(uint);

protected:
    Q3CListIt *it;                        // iterator on cache list
};

QT_END_HEADER

#endif // Q3GCACHE_H

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