/**********************************************************************
 *
 * tdbclass.h --
 *
 * Copyright (C) 2011  The New Zealand Digital Library Project
 *
 * A component of the Greenstone digital library software
 * from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *********************************************************************/

#ifndef TDBCLASS_H
#define TDBCLASS_H

#include "gsdlconf.h"
#include "dbclass.h"
#include "tdb.h"

class tdbclass : public dbclass
{

public:
  tdbclass(const text_t& gsdlhome);
  ~tdbclass();

  // returns true if opened
  bool opendatabase (const text_t &filename, int mode, int num_retrys, bool need_filelock);

  void closedatabase ();

  void deletekey (const text_t &key);

  // returns file extension string
  text_t getfileextension ();

  // returns true on success
  bool getkeydata (const text_t& key, text_t &data);

  // returns array of keys
  text_tarray getkeys ();

  // returns true on success
  bool setkeydata (const text_t &key, const text_t &data);

protected:
  text_t openfile;
  TDB_CONTEXT *tdb;

  text_t getfirstkey ();
  text_t getnextkey (const text_t &key);

};

#endif