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- Committer: Monty Taylor
- Date: 2008-11-14 23:27:02 UTC
- mto: (584.1.7 devel)
- mto: This revision was merged to the branch mainline in revision 588.
- Revision ID: monty@inaugust.com-20081114232702-xd6jzs32qw21akyc
Split out DTCollation.
added
removed
drizzled/dtcollation.cc
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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* Copyright (C) 2008 Sun Microsystems
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <drizzled/server_includes.h>
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#include <drizzled/definitions.h>
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#include <mysys/my_sys.h>
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#include <mystrings/m_ctype.h>
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#include <drizzled/error.h>
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#include <drizzled/dtcollation.h>
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static bool
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left_is_superset(const DTCollation &left, const DTCollation &right)
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{
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/* Allow convert to Unicode */
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if (left.collation->state & MY_CS_UNICODE &&
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(left.derivation < right.derivation ||
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(left.derivation == right.derivation &&
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!(right.collation->state & MY_CS_UNICODE))))
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return true;
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/* Allow convert from ASCII */
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if (right.repertoire == MY_REPERTOIRE_ASCII &&
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(left.derivation < right.derivation ||
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(left.derivation == right.derivation &&
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!(left.repertoire == MY_REPERTOIRE_ASCII))))
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return true;
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/* Disallow conversion otherwise */
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return false;
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}
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DTCollation::DTCollation()
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{
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collation= &my_charset_bin;
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derivation= DERIVATION_NONE;
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repertoire= MY_REPERTOIRE_UNICODE30;
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}
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DTCollation::DTCollation(const CHARSET_INFO * const collation_arg,
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Derivation derivation_arg)
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{
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collation= collation_arg;
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derivation= derivation_arg;
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set_repertoire_from_charset(collation_arg);
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}
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void DTCollation::set_repertoire_from_charset(const CHARSET_INFO * const cs)
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{
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repertoire= cs->state & MY_CS_PUREASCII ?
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MY_REPERTOIRE_ASCII : MY_REPERTOIRE_UNICODE30;
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}
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void DTCollation::set(DTCollation &dt)
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{
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collation= dt.collation;
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derivation= dt.derivation;
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repertoire= dt.repertoire;
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}
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void DTCollation::set(const CHARSET_INFO * const collation_arg,
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Derivation derivation_arg)
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{
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collation= collation_arg;
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derivation= derivation_arg;
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set_repertoire_from_charset(collation_arg);
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}
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void DTCollation::set(const CHARSET_INFO * const collation_arg,
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Derivation derivation_arg,
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uint32_t repertoire_arg)
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{
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collation= collation_arg;
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derivation= derivation_arg;
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repertoire= repertoire_arg;
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}
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void DTCollation::set(const CHARSET_INFO * const collation_arg)
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{
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collation= collation_arg;
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set_repertoire_from_charset(collation_arg);
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}
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void DTCollation::set(Derivation derivation_arg)
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{
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derivation= derivation_arg;
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}
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bool DTCollation::aggregate(DTCollation &dt, uint32_t flags)
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{
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if (!my_charset_same(collation, dt.collation))
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{
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/*
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We do allow to use binary strings (like BLOBS)
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together with character strings.
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Binaries have more precedence than a character
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string of the same derivation.
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*/
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if (collation == &my_charset_bin)
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{
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if (derivation <= dt.derivation)
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; // Do nothing
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else
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{
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set(dt);
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}
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}
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else if (dt.collation == &my_charset_bin)
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{
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if (dt.derivation <= derivation)
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{
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set(dt);
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}
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else
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{
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// Do nothing
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}
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}
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else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
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left_is_superset(*this, dt))
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{
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// Do nothing
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}
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else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
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left_is_superset(dt, *this))
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{
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set(dt);
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}
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else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
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derivation < dt.derivation &&
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dt.derivation >= DERIVATION_SYSCONST)
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{
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// Do nothing;
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}
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else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
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dt.derivation < derivation &&
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derivation >= DERIVATION_SYSCONST)
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{
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set(dt);
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}
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else
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{
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// Cannot apply conversion
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set(0, DERIVATION_NONE, 0);
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return 1;
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}
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}
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else if (derivation < dt.derivation)
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{
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// Do nothing
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}
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else if (dt.derivation < derivation)
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{
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set(dt);
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}
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else
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{
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if (collation == dt.collation)
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{
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// Do nothing
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}
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else
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{
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if (derivation == DERIVATION_EXPLICIT)
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{
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set(0, DERIVATION_NONE, 0);
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return 1;
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}
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if (collation->state & MY_CS_BINSORT)
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return 0;
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if (dt.collation->state & MY_CS_BINSORT)
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{
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set(dt);
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return 0;
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}
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const CHARSET_INFO * const bin= get_charset_by_csname(collation->csname,
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MY_CS_BINSORT,
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MYF(0));
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set(bin, DERIVATION_NONE);
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}
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}
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repertoire|= dt.repertoire;
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return 0;
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}
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bool DTCollation::set(DTCollation &dt1, DTCollation &dt2, uint32_t flags)
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{ set(dt1); return aggregate(dt2, flags); }
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const char *DTCollation::derivation_name() const
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{
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switch(derivation)
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{
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case DERIVATION_IGNORABLE: return "IGNORABLE";
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case DERIVATION_COERCIBLE: return "COERCIBLE";
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case DERIVATION_IMPLICIT: return "IMPLICIT";
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case DERIVATION_SYSCONST: return "SYSCONST";
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case DERIVATION_EXPLICIT: return "EXPLICIT";
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case DERIVATION_NONE: return "NONE";
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default: return "UNKNOWN";
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}
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}
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bool agg_item_collations(DTCollation &c, const char *fname,
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Item **av, uint32_t count,
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uint32_t flags, int item_sep)
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{
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uint32_t i;
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Item **arg;
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c.set(av[0]->collation);
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for (i= 1, arg= &av[item_sep]; i < count; i++, arg++)
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{
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if (c.aggregate((*arg)->collation, flags))
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{
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my_coll_agg_error(av, count, fname, item_sep);
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return true;
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}
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}
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if ((flags & MY_COLL_DISALLOW_NONE) &&
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c.derivation == DERIVATION_NONE)
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{
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my_coll_agg_error(av, count, fname, item_sep);
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return true;
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}
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return false;
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}
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bool agg_item_collations_for_comparison(DTCollation &c, const char *fname,
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Item **av, uint32_t count,
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uint32_t flags)
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{
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return (agg_item_collations(c, fname, av, count,
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flags | MY_COLL_DISALLOW_NONE, 1));
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}
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bool agg_item_charsets(DTCollation &coll, const char *fname,
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Item **args, uint32_t nargs, uint32_t flags,
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int item_sep)
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{
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Item **arg, *safe_args[2];
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memset(safe_args, 0, sizeof(safe_args));
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if (agg_item_collations(coll, fname, args, nargs, flags, item_sep))
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return true;
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/*
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For better error reporting: save the first and the second argument.
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We need this only if the the number of args is 3 or 2:
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- for a longer argument list, "Illegal mix of collations"
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doesn't display each argument's characteristics.
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- if nargs is 1, then this error cannot happen.
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*/
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if (nargs >=2 && nargs <= 3)
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{
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safe_args[0]= args[0];
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safe_args[1]= args[item_sep];
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}
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Session *session= current_session;
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bool res= false;
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uint32_t i;
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for (i= 0, arg= args; i < nargs; i++, arg+= item_sep)
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{
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Item* conv;
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uint32_t dummy_offset;
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if (!String::needs_conversion(0, (*arg)->collation.collation,
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coll.collation,
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&dummy_offset))
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continue;
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if (!(conv= (*arg)->safe_charset_converter(coll.collation)) &&
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((*arg)->collation.repertoire == MY_REPERTOIRE_ASCII))
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conv= new Item_func_conv_charset(*arg, coll.collation, 1);
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if (!conv)
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{
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if (nargs >=2 && nargs <= 3)
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{
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/* restore the original arguments for better error message */
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args[0]= safe_args[0];
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args[item_sep]= safe_args[1];
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}
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my_coll_agg_error(args, nargs, fname, item_sep);
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res= true;
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break; // we cannot return here, we need to restore "arena".
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}
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if ((*arg)->type() == Item::FIELD_ITEM)
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((Item_field *)(*arg))->no_const_subst= 1;
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/*
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If in statement prepare, then we create a converter for two
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constant items, do it once and then reuse it.
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If we're in execution of a prepared statement, arena is NULL,
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and the conv was created in runtime memory. This can be
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the case only if the argument is a parameter marker ('?'),
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because for all true constants the charset converter has already
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been created in prepare. In this case register the change for
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rollback.
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*/
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session->change_item_tree(arg, conv);
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/*
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We do not check conv->fixed, because Item_func_conv_charset which can
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be return by safe_charset_converter can't be fixed at creation
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*/
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conv->fix_fields(session, arg);
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}
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return res;
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}
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void my_coll_agg_error(DTCollation &c1,
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DTCollation &c2, const char *fname)
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{
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my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
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c1.collation->name,c1.derivation_name(),
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c2.collation->name,c2.derivation_name(),
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fname);
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}
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void my_coll_agg_error(DTCollation &c1,
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DTCollation &c2,
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DTCollation &c3,
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const char *fname)
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{
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my_error(ER_CANT_AGGREGATE_3COLLATIONS,MYF(0),
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c1.collation->name,c1.derivation_name(),
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c2.collation->name,c2.derivation_name(),
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c3.collation->name,c3.derivation_name(),
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fname);
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}
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void my_coll_agg_error(Item** args, uint32_t count, const char *fname,
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int item_sep)
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{
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if (count == 2)
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my_coll_agg_error(args[0]->collation, args[item_sep]->collation, fname);
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else if (count == 3)
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my_coll_agg_error(args[0]->collation, args[item_sep]->collation,
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args[2*item_sep]->collation, fname);
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else
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my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),fname);
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}
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