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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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; version 2 of the License.
*
* 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_FUNCTION_STR_CONV_CHARSET_H
#define DRIZZLED_FUNCTION_STR_CONV_CHARSET_H
#include <drizzled/function/str/strfunc.h>
namespace drizzled
{
class Item_func_conv_charset :public Item_str_func
{
bool use_cached_value;
public:
bool safe;
const CHARSET_INFO *conv_charset; // keep it public
Item_func_conv_charset(Item *a, const CHARSET_INFO * const cs) :Item_str_func(a)
{ conv_charset= cs; use_cached_value= 0; safe= 0; }
Item_func_conv_charset(Item *a, const CHARSET_INFO * const cs, bool cache_if_const)
:Item_str_func(a)
{
assert(args[0]->fixed);
conv_charset= cs;
if (cache_if_const && args[0]->const_item())
{
uint32_t errors= 0;
String tmp, *str= args[0]->val_str(&tmp);
if (!str || str_value.copy(str->ptr(), str->length(),
str->charset(), conv_charset, &errors))
null_value= 1;
use_cached_value= 1;
str_value.mark_as_const();
safe= (errors == 0);
}
else
{
use_cached_value= 0;
/*
Conversion from and to "binary" is safe.
Conversion to Unicode is safe.
Other kind of conversions are potentially lossy.
*/
safe= (args[0]->collation.collation == &my_charset_bin ||
cs == &my_charset_bin ||
(cs->state & MY_CS_UNICODE));
}
}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "convert"; }
virtual void print(String *str, enum_query_type query_type);
};
} /* namespace drizzled */
#endif /* DRIZZLED_FUNCTION_STR_CONV_CHARSET_H */
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