~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

 */

#include <config.h>

#include <boost/lexical_cast.hpp>

#include <drizzled/field/enum.h>

#include <drizzled/error.h>

#include <drizzled/table.h>

#include <drizzled/session.h>

#include <drizzled/typelib.h>

#include <sstream>

#include <string>

namespace drizzled {

/****************************************************************************

** enum type.

** This is a string which only can have a selection of different values.

** If one uses this string in a number context one gets the type number.

****************************************************************************/

void Field_enum::store_type(uint64_t value)

{

  value--; /* we store as starting from 0, although SQL starts from 1 */

#ifdef WORDS_BIGENDIAN

  if (getTable()->getShare()->db_low_byte_first)

  {

    int4store(ptr, (unsigned short) value);

  }

  else

#endif

    longstore(ptr, (unsigned short) value);

}

/**

 * Given a supplied string, looks up the string in the internal typelib

 * and stores the found key.  Upon not finding an entry in the typelib,

 * we always throw an error.

 */

int Field_enum::store(const char *from, uint32_t length, const charset_info_st * const)

{

  uint32_t tmp;

  ASSERT_COLUMN_MARKED_FOR_WRITE;

  /* Remove end space */

  length= field_charset->cset->lengthsp(field_charset, from, length);

  tmp= typelib->find_type2(from, length, field_charset);

  if (! tmp)

  {

    if (length < 6) /* Can't be more than 99999 enums */

    {

      /* This is for reading numbers with LOAD DATA INFILE */

      /* Convert the string to an integer using stringstream */

      std::stringstream ss;

      ss << from;

      ss >> tmp;

      if (tmp == 0 || tmp > typelib->count)

      {

        my_error(ER_INVALID_ENUM_VALUE, MYF(ME_FATALERROR), from);

        return 1;

      }

    }

    else

    {

      my_error(ER_INVALID_ENUM_VALUE, MYF(ME_FATALERROR), from);

      return 1;

    }

  }

  store_type((uint64_t) tmp);

  return 0;

}

int Field_enum::store(double from)

{

  return Field_enum::store((int64_t) from, false);

}

/**

 * @note MySQL allows 0 values, saying that 0 is "the index of the

 * blank string error", whatever that means.  Uhm, Drizzle doesn't

 * allow this.  To store an ENUM column value using an integer, you

 * must specify the 1-based index of the enum column definition's

 * key.

 */

int Field_enum::store(int64_t from, bool)

{

  ASSERT_COLUMN_MARKED_FOR_WRITE;

  if (from <= 0 || (uint64_t) from > typelib->count)

  {

    /* Convert the integer to a string using boost::lexical_cast */

    std::string tmp(boost::lexical_cast<std::string>(from));

    my_error(ER_INVALID_ENUM_VALUE, MYF(ME_FATALERROR), tmp.c_str());

    return 1;

  }

  store_type((uint64_t) (uint32_t) from);

  return 0;

}

double Field_enum::val_real(void) const

{

  return (double) Field_enum::val_int();

}

int64_t Field_enum::val_int(void) const

{

  ASSERT_COLUMN_MARKED_FOR_READ;

  uint16_t tmp;

#ifdef WORDS_BIGENDIAN

  if (getTable()->getShare()->db_low_byte_first)

    tmp= sint4korr(ptr);

  else

#endif

    longget(tmp,ptr);

  return ((int64_t) tmp) + 1; /* SQL is from 1, we store from 0 */

}

String *Field_enum::val_str(String *, String *val_ptr) const

{

  uint32_t tmp=(uint32_t) Field_enum::val_int();

  ASSERT_COLUMN_MARKED_FOR_READ;

  if (not tmp || tmp > typelib->count)

  {

    val_ptr->set("", 0, field_charset);

  }

  else

  {

    val_ptr->set((const char*) typelib->type_names[tmp-1], typelib->type_lengths[tmp-1], field_charset);

  }

  return val_ptr;

}

int Field_enum::cmp(const unsigned char *a_ptr, const unsigned char *b_ptr)

{

  unsigned char *old= ptr;

  ptr= (unsigned char*) a_ptr;

  uint64_t a= Field_enum::val_int();

  ptr= (unsigned char*) b_ptr;

  uint64_t b= Field_enum::val_int();

  ptr= old;

  return (a < b) ? -1 : (a > b) ? 1 : 0;

}

void Field_enum::sort_string(unsigned char *to,uint32_t )

{

  uint64_t value=Field_enum::val_int()-1; /* SQL is 1 based, stored as 0 based*/

  to+=pack_length() -1;

  for (uint32_t i=0 ; i < pack_length() ; i++)

  {

    *to-- = (unsigned char) (value & 255);

    value>>=8;

  }

}

Field *Field_enum::new_field(memory::Root *root, Table *new_table,

                             bool keep_type)

{

  Field_enum *res= (Field_enum*) Field::new_field(root, new_table, keep_type);

  if (res)

  {

    res->typelib= typelib->copy_typelib(*root);

  }

  return res;

}

} /* namespace drizzled */