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Viewing changes to drizzled/hybrid_type_traits_decimal.cc

  • Committer: Bazaar Package Importer
  • Author(s): Monty Taylor
  • Date: 2010-03-18 12:12:31 UTC
  • Revision ID: james.westby@ubuntu.com-20100318121231-k6g1xe6cshbwa0f8
Tags: upstream-2010.03.1347
Import upstream version 2010.03.1347

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drizzled/hybrid_type_traits_decimal.cc
 
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 
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 *
 
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 *  Copyright (C) 2008 Sun Microsystems
 
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 *
 
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 *  This program is free software; you can redistribute it and/or modify
 
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 *  it under the terms of the GNU General Public License as published by
 
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 *  the Free Software Foundation; version 2 of the License.
 
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 *
 
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 *  This program is distributed in the hope that it will be useful,
 
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 *  GNU General Public License for more details.
 
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 *
 
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 *  You should have received a copy of the GNU General Public License
 
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 *  along with this program; if not, write to the Free Software
 
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
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 */
 
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#include "config.h"
 
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#include "drizzled/hybrid_type_traits_decimal.h"
 
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#include "drizzled/hybrid_type.h"
 
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#include "drizzled/definitions.h"
 
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#include "drizzled/item.h"
 
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#include <algorithm>
 
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using namespace std;
 
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namespace drizzled
 
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{
 
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/* Hybrid_type_traits_decimal */
 
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static const Hybrid_type_traits_decimal decimal_traits_instance;
 
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Item_result Hybrid_type_traits_decimal::type() const { return DECIMAL_RESULT; }
 
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void
 
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Hybrid_type_traits_decimal::fix_length_and_dec(Item *item, Item *arg) const
 
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{
 
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  item->decimals= arg->decimals;
 
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  item->max_length= min(arg->max_length + DECIMAL_LONGLONG_DIGITS,
 
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                        (unsigned int)DECIMAL_MAX_STR_LENGTH);
 
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}
 
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void Hybrid_type_traits_decimal::set_zero(Hybrid_type *val) const
 
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{
 
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  my_decimal_set_zero(&val->dec_buf[0]);
 
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  val->used_dec_buf_no= 0;
 
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}
 
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void Hybrid_type_traits_decimal::add(Hybrid_type *val, Field *f) const
 
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{
 
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  my_decimal_add(E_DEC_FATAL_ERROR,
 
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                 &val->dec_buf[val->used_dec_buf_no ^ 1],
 
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                 &val->dec_buf[val->used_dec_buf_no],
 
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                 f->val_decimal(&val->dec_buf[2]));
 
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  val->used_dec_buf_no^= 1;
 
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}
 
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/**
 
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  @todo
 
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  what is '4' for scale?
 
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*/
 
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void Hybrid_type_traits_decimal::div(Hybrid_type *val, uint64_t u) const
 
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{
 
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  int2my_decimal(E_DEC_FATAL_ERROR, u, true, &val->dec_buf[2]);
 
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  /* XXX: what is '4' for scale? */
 
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  my_decimal_div(E_DEC_FATAL_ERROR,
 
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                 &val->dec_buf[val->used_dec_buf_no ^ 1],
 
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                 &val->dec_buf[val->used_dec_buf_no],
 
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                 &val->dec_buf[2], 4);
 
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  val->used_dec_buf_no^= 1;
 
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}
 
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int64_t
 
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Hybrid_type_traits_decimal::val_int(Hybrid_type *val, bool unsigned_flag) const
 
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{
 
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  int64_t result;
 
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  my_decimal2int(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
 
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                 unsigned_flag, &result);
 
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  return result;
 
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}
 
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double
 
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Hybrid_type_traits_decimal::val_real(Hybrid_type *val) const
 
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{
 
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  my_decimal2double(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
 
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                    &val->real);
 
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  return val->real;
 
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}
 
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my_decimal *Hybrid_type_traits_decimal::val_decimal(Hybrid_type *val,
 
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                                                    my_decimal *) const
 
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{ return &val->dec_buf[val->used_dec_buf_no]; }
 
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String *
 
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Hybrid_type_traits_decimal::val_str(Hybrid_type *val, String *to,
 
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                                    uint8_t decimals) const
 
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{
 
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  my_decimal_round(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
 
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                   decimals, false, &val->dec_buf[2]);
 
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  my_decimal2string(E_DEC_FATAL_ERROR, &val->dec_buf[2], 0, 0, 0, to);
 
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  return to;
 
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}
 
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const Hybrid_type_traits_decimal *Hybrid_type_traits_decimal::instance()
 
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{
 
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  return &decimal_traits_instance;
 
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}
 
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Hybrid_type_traits_decimal::Hybrid_type_traits_decimal()
 
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{}
 
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} /* namespace drizzled */