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/* - 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 */
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