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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
*/
#include "config.h"
#include <drizzled/dtcollation.h>
#include <drizzled/definitions.h>
#include "drizzled/internal/my_sys.h"
#include "drizzled/charset_info.h"
#include <drizzled/error.h>
#include <drizzled/function/str/conv_charset.h>
#include <drizzled/session.h>
#include "drizzled/charset.h"
DTCollation::DTCollation()
{
collation= &my_charset_bin;
derivation= DERIVATION_NONE;
}
DTCollation::DTCollation(const CHARSET_INFO * const collation_arg,
Derivation derivation_arg)
{
collation= collation_arg;
derivation= derivation_arg;
}
void DTCollation::set(DTCollation &dt)
{
collation= dt.collation;
derivation= dt.derivation;
}
void DTCollation::set(const CHARSET_INFO * const collation_arg,
Derivation derivation_arg)
{
collation= collation_arg;
derivation= derivation_arg;
}
void DTCollation::set(const CHARSET_INFO * const collation_arg)
{
collation= collation_arg;
}
void DTCollation::set(Derivation derivation_arg)
{
derivation= derivation_arg;
}
bool DTCollation::aggregate(DTCollation &dt, uint32_t flags)
{
if (!my_charset_same(collation, dt.collation))
{
/*
We do allow to use binary strings (like BLOBS)
together with character strings.
Binaries have more precedence than a character
string of the same derivation.
*/
if (collation == &my_charset_bin)
{
if (derivation <= dt.derivation)
; // Do nothing
else
{
set(dt);
}
}
else if (dt.collation == &my_charset_bin)
{
if (dt.derivation <= derivation)
{
set(dt);
}
else
{
// Do nothing
}
}
else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
collation->state & MY_CS_UNICODE &&
(derivation < dt.derivation ||
(derivation == dt.derivation &&
!(dt.collation->state & MY_CS_UNICODE))))
{
// Do nothing
}
else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
dt.collation->state & MY_CS_UNICODE &&
(dt.derivation < derivation ||
(dt.derivation == derivation &&
!(collation->state & MY_CS_UNICODE))))
{
set(dt);
}
else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
derivation < dt.derivation &&
dt.derivation >= DERIVATION_SYSCONST)
{
// Do nothing;
}
else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
dt.derivation < derivation &&
derivation >= DERIVATION_SYSCONST)
{
set(dt);
}
else
{
// Cannot apply conversion
set(0, DERIVATION_NONE);
return true;
}
}
else if (derivation < dt.derivation)
{
// Do nothing
}
else if (dt.derivation < derivation)
{
set(dt);
}
else
{
if (collation == dt.collation)
{
// Do nothing
}
else
{
if (derivation == DERIVATION_EXPLICIT)
{
set(0, DERIVATION_NONE);
return true;
}
if (collation->state & MY_CS_BINSORT)
return false;
if (dt.collation->state & MY_CS_BINSORT)
{
set(dt);
return false;
}
const CHARSET_INFO * const bin= get_charset_by_csname(collation->csname, MY_CS_BINSORT);
set(bin, DERIVATION_NONE);
}
}
return false;
}
bool DTCollation::set(DTCollation &dt1, DTCollation &dt2, uint32_t flags)
{ set(dt1); return aggregate(dt2, flags); }
const char *DTCollation::derivation_name() const
{
switch(derivation)
{
case DERIVATION_IGNORABLE: return "IGNORABLE";
case DERIVATION_COERCIBLE: return "COERCIBLE";
case DERIVATION_IMPLICIT: return "IMPLICIT";
case DERIVATION_SYSCONST: return "SYSCONST";
case DERIVATION_EXPLICIT: return "EXPLICIT";
case DERIVATION_NONE: return "NONE";
default: return "UNKNOWN";
}
}
bool agg_item_collations(DTCollation &c, const char *fname,
Item **av, uint32_t count,
uint32_t flags, int item_sep)
{
uint32_t i;
Item **arg;
c.set(av[0]->collation);
for (i= 1, arg= &av[item_sep]; i < count; i++, arg++)
{
if (c.aggregate((*arg)->collation, flags))
{
my_coll_agg_error(av, count, fname, item_sep);
return true;
}
}
if ((flags & MY_COLL_DISALLOW_NONE) &&
c.derivation == DERIVATION_NONE)
{
my_coll_agg_error(av, count, fname, item_sep);
return true;
}
return false;
}
bool agg_item_collations_for_comparison(DTCollation &c, const char *fname,
Item **av, uint32_t count,
uint32_t flags)
{
return (agg_item_collations(c, fname, av, count,
flags | MY_COLL_DISALLOW_NONE, 1));
}
bool agg_item_charsets(DTCollation &coll, const char *fname,
Item **args, uint32_t nargs, uint32_t flags,
int item_sep)
{
Item **arg, *safe_args[2];
memset(safe_args, 0, sizeof(safe_args));
if (agg_item_collations(coll, fname, args, nargs, flags, item_sep))
return true;
/*
For better error reporting: save the first and the second argument.
We need this only if the the number of args is 3 or 2:
- for a longer argument list, "Illegal mix of collations"
doesn't display each argument's characteristics.
- if nargs is 1, then this error cannot happen.
*/
if (nargs >=2 && nargs <= 3)
{
safe_args[0]= args[0];
safe_args[1]= args[item_sep];
}
Session *session= current_session;
bool res= false;
uint32_t i;
for (i= 0, arg= args; i < nargs; i++, arg+= item_sep)
{
Item* conv;
uint32_t dummy_offset;
if (!String::needs_conversion(0, (*arg)->collation.collation,
coll.collation,
&dummy_offset))
continue;
if (!(conv= (*arg)->safe_charset_converter(coll.collation)))
{
if (nargs >=2 && nargs <= 3)
{
/* restore the original arguments for better error message */
args[0]= safe_args[0];
args[item_sep]= safe_args[1];
}
my_coll_agg_error(args, nargs, fname, item_sep);
res= true;
break; // we cannot return here, we need to restore "arena".
}
if ((*arg)->type() == Item::FIELD_ITEM)
((Item_field *)(*arg))->no_const_subst= 1;
/*
If in statement prepare, then we create a converter for two
constant items, do it once and then reuse it.
If we're in execution of a prepared statement, arena is NULL,
and the conv was created in runtime memory. This can be
the case only if the argument is a parameter marker ('?'),
because for all true constants the charset converter has already
been created in prepare. In this case register the change for
rollback.
*/
session->change_item_tree(arg, conv);
/*
We do not check conv->fixed, because Item_func_conv_charset which can
be return by safe_charset_converter can't be fixed at creation
*/
conv->fix_fields(session, arg);
}
return res;
}
void my_coll_agg_error(DTCollation &c1,
DTCollation &c2, const char *fname)
{
my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
c1.collation->name,c1.derivation_name(),
c2.collation->name,c2.derivation_name(),
fname);
}
void my_coll_agg_error(DTCollation &c1,
DTCollation &c2,
DTCollation &c3,
const char *fname)
{
my_error(ER_CANT_AGGREGATE_3COLLATIONS,MYF(0),
c1.collation->name,c1.derivation_name(),
c2.collation->name,c2.derivation_name(),
c3.collation->name,c3.derivation_name(),
fname);
}
void my_coll_agg_error(Item** args, uint32_t count, const char *fname,
int item_sep)
{
if (count == 2)
my_coll_agg_error(args[0]->collation, args[item_sep]->collation, fname);
else if (count == 3)
my_coll_agg_error(args[0]->collation, args[item_sep]->collation,
args[2*item_sep]->collation, fname);
else
my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),fname);
}
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