~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 DRIZZLED_FIELD_ENUM_H

#define DRIZZLED_FIELD_ENUM_H

#include "drizzled/field/str.h"

class Field_enum :public Field_str 

{

protected:

  uint32_t packlength;

public:

  using Field::store;

  using Field::val_int;

  using Field::val_str;

  using Field::cmp;

  /** Internal storage for the string values of the ENUM */

  TYPELIB *typelib;

  Field_enum(unsigned char *ptr_arg,

             uint32_t len_arg,

             unsigned char *null_ptr_arg,

             unsigned char null_bit_arg,

             const char *field_name_arg,

             uint32_t packlength_arg,

             TYPELIB *typelib_arg,

             const CHARSET_INFO * const charset_arg)

    :Field_str(ptr_arg,

               len_arg,

               null_ptr_arg,

               null_bit_arg,

	             field_name_arg,

               charset_arg),

    packlength(packlength_arg),

    typelib(typelib_arg)

  {

    flags|= ENUM_FLAG;

  }

  Field *new_field(MEM_ROOT *root, Table *new_table, bool keep_type);

  enum ha_base_keytype key_type() const;

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

  int  store(double nr);

  int  store(int64_t nr, bool unsigned_val);

  double val_real(void);

  int64_t val_int(void);

  String *val_str(String*, String *);

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

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

  void store_type(uint64_t value);

  void sql_type(String &str) const;

  bool eq_def(Field *field);

  enum_field_types type() const

  {

    return DRIZZLE_TYPE_ENUM;

  }

  enum Item_result cmp_type () const

  {

    return INT_RESULT;

  }

  enum Item_result cast_to_int_type () const

  {

    return INT_RESULT;

  }

  uint32_t pack_length() const

  {

    return (uint32_t) packlength;

  }

  uint32_t size_of() const

  {

    return sizeof(*this);

  }

  enum_field_types real_type() const

  {

    return DRIZZLE_TYPE_ENUM;

  }

  uint32_t pack_length_from_metadata(uint32_t field_metadata)

  {

    return (field_metadata & 0x00ff);

  }

  uint32_t row_pack_length()

  { 

    return pack_length();

  }

  virtual bool zero_pack() const

  {

    return false;

  }

  bool optimize_range(uint32_t, uint32_t) 

  {

    return false;

  }

  bool has_charset(void) const

  {

    return true;

  }

  /* enum and set are sorted as integers */

  const CHARSET_INFO *sort_charset(void) const { return &my_charset_bin; }

private:

  int do_save_field_metadata(unsigned char *first_byte);

};

#endif /* DRIZZLED_FIELD_ENUM_H */