~drizzle-trunk/drizzle/development

/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 MySQL

 *

 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef DRIZZLE_SERVER_FIELD_NEW_DECIMAL

#define DRIZZLE_SERVER_FIELD_NEW_DECIMAL

#include <drizzled/field/num.h>

/* New decimal/numeric field which use fixed point arithmetic */

class Field_new_decimal :public Field_num {

private:

  int do_save_field_metadata(unsigned char *first_byte);

public:

  using Field::store;

  using Field::val_int;

  using Field::val_str;

  using Field::cmp;

  using Field::unpack;

  /* The maximum number of decimal digits can be stored */

  uint32_t precision;

  uint32_t bin_size;

  /*

    Constructors take max_length of the field as a parameter - not the

    precision as the number of decimal digits allowed.

    So for example we need to count length from precision handling

    CREATE TABLE ( DECIMAL(x,y))

  */

  Field_new_decimal(unsigned char *ptr_arg, uint32_t len_arg, unsigned char *null_ptr_arg,

                    unsigned char null_bit_arg,

                    enum utype unireg_check_arg, const char *field_name_arg,

                    uint8_t dec_arg, bool zero_arg, bool unsigned_arg);

  Field_new_decimal(uint32_t len_arg, bool maybe_null_arg,

                    const char *field_name_arg, uint8_t dec_arg,

                    bool unsigned_arg);

  enum_field_types type() const { return DRIZZLE_TYPE_NEWDECIMAL;}

  enum ha_base_keytype key_type() const { return HA_KEYTYPE_BINARY; }

  Item_result result_type () const { return DECIMAL_RESULT; }

  int  reset(void);

  bool store_value(const my_decimal *decimal_value);

  void set_value_on_overflow(my_decimal *decimal_value, bool sign);

  int  store(const char *to, uint32_t length, const CHARSET_INFO * const charset);

  int  store(double nr);

  int  store(int64_t nr, bool unsigned_val);

  int store_time(DRIZZLE_TIME *ltime, enum enum_drizzle_timestamp_type t_type);

  int  store_decimal(const my_decimal *);

  double val_real(void);

  int64_t val_int(void);

  my_decimal *val_decimal(my_decimal *);

  String *val_str(String*, String *);

  int cmp(const unsigned char *, const unsigned char *);

  void sort_string(unsigned char *buff, uint32_t length);

  bool zero_pack() const { return 0; }

  void sql_type(String &str) const;

  uint32_t max_display_length() { return field_length; }

  uint32_t size_of() const { return sizeof(*this); }

  uint32_t pack_length() const { return (uint32_t) bin_size; }

  uint32_t pack_length_from_metadata(uint32_t field_metadata);

  uint32_t row_pack_length() { return pack_length(); }

  int compatible_field_size(uint32_t field_metadata);

  uint32_t is_equal(CreateField *new_field);

  virtual const unsigned char *unpack(unsigned char* to, const unsigned char *from,

                              uint32_t param_data, bool low_byte_first);

};

#endif