// $Id: mergeunit.hxx,v 1.5 1998/05/12 16:49:13 cnidr Exp $
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/*@@@
File:		mergeunit.hxx
Version:	1.00
$Revision: 1.5 $
Description:	Class MERGEUNIT
Author:		Jim Fullton, MCNC/CNIDR
@@@*/



#ifndef MERGEUNIT_HXX
#define MERGEUNIT_HXX

#include "defs.hxx"
#include "idbobj.hxx"

#define LIM 10000

class MERGEUNIT{
	
 public:
  MERGEUNIT();
  GDT_BOOLEAN Smallest(STRING *small);
  GDT_BOOLEAN Initialize(STRING& FileName,const PIDBOBJ DbParent,
			 FILEMAP *map, INT IDValue); // true = success
  GDT_BOOLEAN Empty();				     // true = no more entries
  GPTYPE      GetGp(); // returns the GP
  void        GetSistring (STRING *a);
  GDT_BOOLEAN Flush(FILE *fout);
  GDT_BOOLEAN Load();		// get more items
  void        Write(FILE *fout);
  GDT_BOOLEAN CacheLoad();	// Load Cache From Disk
  void        SetLoadLimit(INT lim);
  
  ~MERGEUNIT();
  
private:
  GDT_BOOLEAN CacheEmpty();
  GDT_BOOLEAN GetIndirectBuffer(const GPTYPE Gp, STRING *Buffer); 
  PIDBOBJ     Parent;
  FILE       *fp;			// file of GP's to read from
  STRING      sistring;
  GPTYPE      Gp;
  FILEMAP    *Map;
  INT         CachePosition;
  INT         LoadLim,ID,CacheWritten,FlushWritten,CacheFlush;
  INT         ItemsToMerge,TotalLoaded;
  
  GPTYPE     *list;
  INT        *Start;
  
  STRING     *sistrings;
  // STRING *names;
  CHR        *Tag;
};



typedef MERGEUNIT *PMERGEUNIT;
#endif