/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * 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 PG_EXTERNALCODE_H_
#define PG_EXTERNALCODE_H_

#include <pg_config.h>

#pragma interface

#include <Code.h>

class ExternalCode : public Code
{
 public:
  const int invalid     = -3;
  const int not_present = -2;
  const int null        = -1;
  const int member      =  0;
  const int first       =  member;
  const int last        =  member;
  
  void unset();
  void nullify();
  
  bool valid(const char*) const;
  
  operator const char* () const;
  
  const ExternalCode& operator = (const char *s);
  const ExternalCode& operator = (const ExternalCode&);
  
  bool OK() const;
  
  int lookup(const char *str) const;
  
  static char *new_dbf_path(char* &dbf_path, const char *dbf_base);

 protected:
  ExternalCode(char* &dbf_path, const char *dbf_base);
  ExternalCode(const char *s, char* &dbf_path, const char *dbf_base);
  ExternalCode(const ExternalCode&);
  
 private:
  static const char *_dbf_libdir;
  const char *_dbf_path;
  char *_string;
  
  void set_dbf_path(char* &dbf_path, const char *dbf_base);
  void set(const char *);
};

#ifndef OUTLINE
# include "ExternalCode.icc"
#endif

#endif /* !PG_EXTERNALCODE_H_ */