/*
 * 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.
 */
#include "pg_config.h"

IDENT("@(#) UnitAtom.cc (Gunther Schadow) 12/19/96");

#pragma implementation "UnitAtom.h"

#include "UnitAtom.h"
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <exception.h>
#include <iostream.h>
#include <ctype.h>
#include <ExternalCode.h>

const UnitAtom::unit_s UnitAtom::null_unit =
    {"1", NULL, NULL, NULL, {0, 0, 0, 0, 0, 0}, 1, 0};

static const char *units_db_base = "units.db";
static char *units_db_file = NULL;

odbm::odbm_file UnitAtom::odbmf = odbm::null_dbf;
u_int UnitAtom::odbm_obj_cnt = 0;

UnitAtom::UnitAtom()
     : Code(),
       odbm(&unit.name, &unit.cnv_name, &unit.base,
	    sizeof(unit.base) + sizeof(unit.coeff_mantissa)
	    + sizeof(unit.coeff_exponent),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(units_db_file, units_db_base))
{
  unit = null_unit;
}

UnitAtom::UnitAtom(int mode)
     : Code(),
       odbm(&unit.name, &unit.cnv_name, &unit.base,
	    sizeof(unit.base) + sizeof(unit.coeff_mantissa)
	    + sizeof(unit.coeff_exponent),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(units_db_file, units_db_base), mode)
{
  unit = null_unit;
}

UnitAtom::UnitAtom(const UnitAtom& x) : Code(), odbm(x)
{}

UnitAtom::UnitAtom(const char *name)
     : Code(),
       odbm(&unit.name, &unit.cnv_name, &unit.base,
	    sizeof(unit.base) + sizeof(unit.coeff_mantissa)
	    + sizeof(unit.coeff_exponent),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(units_db_file, units_db_base))
{
  set(name);
}

UnitAtom::~UnitAtom()
{
  if(unit.name != UnitAtom::null_unit.name && unit.name != NULL)
    free(unit.name);
}

UnitAtom &UnitAtom::operator = (const UnitAtom &x)
{
  if(unit.name != UnitAtom::null_unit.name && unit.name != NULL)
    free(unit.name);
  odbm::operator = (x);
  return *this;
}

ostream &
UnitAtom::unit_s::show(ostream &os) const
{
  os << name << "(";
  return base.show(os) << ", "
    << coeff_mantissa << "*10^"
    << coeff_exponent << ", ["
    << (void*)cnv_from << ":"
    << (void*)cnv_to << "])";
}

void
UnitAtom::set(const char *s)
{
  unit.name = strdup(s);

  // convert to lower case, I don't want this, but HL7 says so!
  for(char *p = unit.name; *p != 0; p++) *p = tolower((int)p);

  if(fetch(s) == FAIL)
    ERROR("unit `%s' not found", s);
  cnv_func::resolve(unit);
  Code::set();
}

bool
UnitAtom::lookup(const char *s)
{
  if(fetch(s) == SUCCESS)
    {
      cnv_func::resolve(unit);
      return TRUE;
    }
  else
    return FALSE;
}