~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

 */

#pragma once

#include <drizzled/field/str.h>

namespace drizzled {

/*

 * Everything saved in this will disappear. It will always return NULL

 */

class Field_null : public Field_str

{

  static unsigned char null;

public:

  using Field::store;

  using Field::val_str;

  using Field::cmp;

  using Field::val_int;

  Field_null(unsigned char *ptr_arg, uint32_t len_arg, const char *field_name_arg) :

    Field_str(ptr_arg, len_arg, &null, 1, field_name_arg, &my_charset_bin)

  {}

  enum_field_types type() const

  {

    return DRIZZLE_TYPE_NULL;

  }

  int store(const char *, uint32_t, const charset_info_st * const)

  {

    return 0;

  }

  int store(double)

  {

    return 0;

  }

  int store(int64_t, bool)

  {

    return 0;

  }

  int store_decimal(const type::Decimal *)

  {

    return 0;

  }

  int reset()

  {

    return 0;

  }

  double val_real() const

  {

    return 0.0;

  }

  int64_t val_int() const

  {

    return 0;

  }

  type::Decimal *val_decimal(type::Decimal *) const

  {

    return 0;

  }

  String *val_str(String *, String *value2) const

  {

    value2->length(0);

    return value2;

  }

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

  {

    return 0;

  }

  void sort_string(unsigned char *, uint32_t)

  {}

  uint32_t pack_length() const

  {

    return 0;

  }

  uint32_t size_of() const

  {

    return sizeof(*this);

  }

  uint32_t max_display_length()

  {

    return 4;

  }

};

} /* namespace drizzled */