src/QueueAccessFile.h

/*  -*- C++ -*-

    textIR - A fast text document retrieval engine

    Copyright (C) 2005-2009 Laurence Park

    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/>.

    File information:
    $Header: /home/staff/lapark/cvsroot/web_search/textIR/src/QueueAccessFile.h,v 1.4.2.1 2009/11/09 13:13:42 lapark Exp $
*/

#ifndef QUEUEACCESSFILE_H
#define QUEUEACCESSFILE_H

#include <fstream>
#include "FileIO.h"
#include "FileBlockQueue.h"

class QueueAccessFile : public FileIO
{
 public:

  QueueAccessFile(const char *filename,std::ios::openmode mode);

  QueueAccessFile(const char *filename,std::ios::openmode mode, 
                  FileBlockQueue *sQueue,
                  FileBlockQueue *uQueue);

  QueueAccessFile(const char *filename,std::ios::openmode mode, 
                  FileBlockQueue *uQueue);
  
  virtual ~QueueAccessFile(void);
  
  virtual void nextFileBlock(char *buffer, int blockSize) = 0;
  
  void addQueue(FileBlockQueue *fQueue);

  void addFreeBlock(FILE_POS_TYPE position);

  FileBlockQueue *usedBlocks(void);
  
  FILE_POS_TYPE usedFileBytes(void);

  void segmentAccesses(long segment, FILE_POS_TYPE start, FILE_POS_TYPE end);

  void segmentAccesses(long segment, FILE_POS_TYPE start);


 protected:

  FileBlockQueue *spareQueue;

  FileBlockQueue *usedQueue;

  FILE_POS_TYPE usedBytes;

 private:
  const int ownQueues;
};

#endif

---