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DjVuFileCache.h

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//C-  -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001  AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, Version 2. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//C- GNU General Public License for more details.
//C- 
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
//C- distributed by Lizardtech Software.  On July 19th 2002, Lizardtech 
//C- Software authorized us to replace the original DjVu(r) Reference 
//C- Library notice by the following text (see doc/lizard2002.djvu):
//C-
//C-  ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, Version 2. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE."  Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
//C- | General Public License.   This grant only confers the right to 
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
//C- | the extent such infringement is reasonably necessary to enable 
//C- | recipient to make, have made, practice, sell, or otherwise dispose 
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
//C- | any greater extent that may be necessary to utilize further 
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
// 
// $Id: DjVuFileCache.h,v 1.8 2003/11/07 22:08:20 leonb Exp $
// $Name: release_3_5_15 $

#ifndef _DJVUFILECACHE_H
#define _DJVUFILECACHE_H
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma interface
#endif


#include "DjVuFile.h"

#ifndef macintosh //MCW can't compile
# ifndef UNDER_CE
#  include <sys/types.h>
#  include <time.h>
# endif 
#else
# include <time.h>
#endif


#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif


#ifdef UNDER_CE
class DjVuFileCache : public GPEnabled
{
protected:
   DjVuFileCache(const int) {}
public:
   static GP<DjVuFileCache> create(const int);
   virtual ~DjVuFileCache(void);
   void del_file(const DjVuFile *) {}
   void add_file(const GP<DjVuFile> &) {}
   void clear(void) {}
   void set_max_size(int) {}
   int get_max_size(void) const {return 0;}
   void enable(bool en) {}
   bool is_enabled(void) const {return false;}
} ;
#else
class DjVuFileCache : public GPEnabled
{
protected:
   DjVuFileCache(const int max_size=5*2*1024*1024);
public:
   static GP<DjVuFileCache> create(const int max_size=5*2*1024*1024);

   virtual ~DjVuFileCache(void);

   void     del_file(const DjVuFile * file);

   void     add_file(const GP<DjVuFile> & file);

   void     clear(void);
   void     set_max_size(int max_size);

   int      get_max_size(void) const;

   void     enable(bool en);

   bool     is_enabled(void) const;

public:
   class Item;
   
   class Item : public GPEnabled
    {
    public:
       virtual ~Item(void);
       time_t       get_time(void) const;

       GP<DjVuFile> get_file(void) const;
       unsigned int get_size(void) const;
       
       void     refresh(void);

    public:
       GP<DjVuFile> file;
       time_t       time;
       GPosition        list_pos;
       static int   qsort_func(const void * el1, const void * el2);

       Item(void);
       Item(const GP<DjVuFile> & xfile);
    };

protected:
   GCriticalSection class_lock;
   
   virtual void file_added(const GP<DjVuFile> & file);
   virtual void file_deleted(const GP<DjVuFile> & file);
   virtual void file_cleared(const GP<DjVuFile> & file);

   GPList<Item> get_items(void);
private:
   GPList<Item> list;
   bool     enabled;
   int      max_size;
   int      cur_size;

   int      calculate_size(void);
   void     clear_to_size(int size);
};



   
inline
DjVuFileCache::Item::Item(void) : time(::time(0)) {}

inline
DjVuFileCache::Item::Item(const GP<DjVuFile> & xfile) :
      file(xfile), time(::time(0)) {}

inline
DjVuFileCache::Item::~Item(void) {}

inline GP<DjVuFile>
DjVuFileCache::Item::get_file(void) const
{
   return file;
}

inline unsigned int
DjVuFileCache::Item::get_size(void) const
{
   return file->get_memory_usage();
}

inline time_t
DjVuFileCache::Item::get_time(void) const
{
   return time;
}

inline void
DjVuFileCache::Item::refresh(void)
{
   time=::time(0);
}

inline
DjVuFileCache::DjVuFileCache(const int xmax_size) :
      enabled(true), max_size(xmax_size), cur_size(0) {}

inline void
DjVuFileCache::clear(void)
{
   clear_to_size(0);
}

inline bool
DjVuFileCache::is_enabled(void) const
{
   return enabled;
}

inline int
DjVuFileCache::get_max_size(void) const
{
   return max_size;
}

#endif

inline GP<DjVuFileCache>
DjVuFileCache::create(const int max_size)
{
  return new DjVuFileCache(max_size);
}


#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
#endif

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