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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, Inc.
*
* 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/error.h>
#include <drizzled/function/str/conv_charset.h>
#include <drizzled/session.h>
#include <drizzled/charset.h>
namespace drizzled {
DTCollation::DTCollation()
{
collation= &my_charset_bin;
derivation= DERIVATION_NONE;
}
DTCollation::DTCollation(const charset_info_st * 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_st * const collation_arg,
Derivation derivation_arg)
{
collation= collation_arg;
derivation= derivation_arg;
}
void DTCollation::set(const charset_info_st * 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_st * 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)
{
if (agg_item_collations(coll, fname, args, nargs, flags, item_sep))
return true;
return false;
}
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);
}
} /* namespace drizzled */
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