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  • Committer: Monty Taylor
  • Date: 2008-11-15 18:39:51 UTC
  • mto: (584.1.7 devel)
  • mto: This revision was merged to the branch mainline in revision 588.
  • Revision ID: monty@inaugust.com-20081115183951-jo2v3abwdu24lnwq
Split out hybrid_type_traits.

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Lines of Context:
drizzled/item.cc
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const String my_null_string("NULL", 4, default_charset_info);
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/****************************************************************************/
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/* Hybrid_type_traits {_real} */
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void Hybrid_type_traits::fix_length_and_dec(Item *item, Item *arg) const
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{
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  item->decimals= NOT_FIXED_DEC;
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  item->max_length= item->float_length(arg->decimals);
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}
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static const Hybrid_type_traits real_traits_instance;
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const Hybrid_type_traits *Hybrid_type_traits::instance()
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{
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  return &real_traits_instance;
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}
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int64_t Hybrid_type_traits::val_int(Hybrid_type *val,
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                                    bool) const
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{
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  return (int64_t) rint(val->real);
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}
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my_decimal *
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Hybrid_type_traits::val_decimal(Hybrid_type *val, my_decimal *) const
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{
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  double2my_decimal(E_DEC_FATAL_ERROR, val->real, val->dec_buf);
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  return val->dec_buf;
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}
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String *
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Hybrid_type_traits::val_str(Hybrid_type *val, String *to, uint8_t decimals) const
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{
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  to->set_real(val->real, decimals, &my_charset_bin);
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  return to;
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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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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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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= cmin(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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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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/* Hybrid_type_traits_integer */
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static const Hybrid_type_traits_integer integer_traits_instance;
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const Hybrid_type_traits_integer *Hybrid_type_traits_integer::instance()
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{
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  return &integer_traits_instance;
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}
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void
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Hybrid_type_traits_integer::fix_length_and_dec(Item *item, Item *) const
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{
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  item->decimals= 0;
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  item->max_length= MY_INT64_NUM_DECIMAL_DIGITS;
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  item->unsigned_flag= 0;
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}
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/*****************************************************************************
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** Item functions