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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_BEGIN_NAMESPACE

QT_MODULE(Qt3SupportLight)

class Q3CList;					// internal classes

class Q3CListIt;

class Q3CDict;

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;

    int	    maxCost()	const	{ return mCost; }

    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;

};

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_NAMESPACE

QT_END_HEADER

#endif // Q3GCACHE_H