giststore.h

来自「此文件包含了在linux下实现tpr-tree索引的源代码」· C头文件 代码 · 共 49 行

// -*- Mode: C++ -*-
//--------------------------------------------------------------------
//        GiSTstore.h
//        -----------
//
//        GiST - Generalized Search Tree 
//        June 2001 release, Aalborg University
//        
//        This file is a revised version of a part of the original 
//        libGiST release (version  0.9beta1)     
//        Copyright (c) 1996, Regents of the University of California
//

#ifndef GISTSTORE_H
#define GISTSTORE_H

#include "GiSTdefs.h"

//--------------------------------------------------------------------
//  GiSTstore is the parent class for storage of GiST pages.  GiSTfile is
//  provided as an example descendant of GiSTstore.
//

class GiSTstore
{
public:
  GiSTstore() : isOpen(0) {}
  virtual void     Create(const char *filename) = 0;
  virtual void     Open  (const char *filename) = 0;
  virtual void     Close () = 0;
  virtual void     Reset () = 0;  // Returns into the state as after Create
  virtual void     Read  (GiSTpage page, char *buf) = 0;
  virtual void     Write (GiSTpage page, const char *buf) = 0;
  virtual GiSTpage Allocate  () = 0;
  virtual void     Deallocate(GiSTpage page) = 0;
  virtual void     Sync      () = 0;
  virtual int      IsOpen    () { return isOpen; }
  virtual int      PageSize  () const = 0;
  virtual ~GiSTstore() {}

protected:
  void SetOpen(int o) { isOpen = o; }

private:
  int isOpen;
};

#endif