/*
 * 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.
 */

/***********************************************************************
 *
 * Abstract base class for any HL7 object
 *
 ***********************************************************************/

#ifndef PG_OBJECT_H_
#define PG_OBJECT_H_

#include <pg_config.h>

#pragma interface

#include <iostream.h>

class PGObject
{

 public:
  enum { 
    present=1, broken=4, zombie=8,         // Vital parameters
    clear=0,                               // Abstractions
  };

  /* subclasses of PGObjects */
  typedef enum
    { 
      message     = 0,
      group       = 1,
      segment     = 2,
      primtype    = 3,
      composite   = 4,
      delimiters  = 5,
      repfld      = 6,
      anyseg      = 7,
      repstrc     = 8,
    }  subclass_t;

 private:
  int        _status;
  subclass_t _subclass;
  int        _type;

 protected:
  virtual void set();

 public:
  PGObject(subclass_t sc, int type);
  virtual ~PGObject();

  virtual void unset();

  virtual subclass_t subclass()   const;
  /*virtual*/ int    type()       const;  // will be hidden by children
  virtual bool       ispresent()  const;
  virtual bool       OK()         const;

  virtual bool       commit() = 0;

  virtual result input (istream&) =0;
  virtual void   output(ostream&) const =0;

  typedef ios&(*er_manip_t)(ios&);

  result str2o(const char *str, er_manip_t = NULL);
  char  *o2str(er_manip_t = NULL);

  inline friend istream& operator>> (istream& is, PGObject& x);
  inline friend ostream& operator<< (ostream& os, const PGObject& x);
};

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

#endif /* !PG_HL7OBJECT_H_ */