/*

 * lftp - file transfer program

 *

 * Copyright (c) 1996-2012 by Alexander V. Lukyanov (lav@yars.free.net)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef CACHE_H

#define CACHE_H

#include "Timer.h"

class CacheEntry : public Timer

{

   friend class Cache;

   CacheEntry *next;

public:

   CacheEntry() { next=0; }

   virtual int EstimateSize() const { return 1; }

   virtual ~CacheEntry() {}

};

class Cache

{

   const ResType *res_max_size;

   const ResType *res_enable;

protected:

   CacheEntry *chain;

   CacheEntry **curr;

   CacheEntry *IterateFirst();

   CacheEntry *IterateNext();

   CacheEntry *IterateDelete();

public:

   void Trim();

   void Flush();

   Cache(const ResType *s,const ResType *e) {

      res_max_size=s;

      res_enable=e;

      chain=0;

      curr=0;

   }

   ~Cache() { Flush(); }

   bool IsEnabled(const char *closure) { return res_enable->QueryBool(closure); }

   long SizeLimit() { return res_max_size->Query(0); }

   void AddCacheEntry(CacheEntry *e) {

      e->next=chain;

      chain=e;

   }

};

#endif//CACHE_H