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/* Copyright (C) 2004 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class interface */
#endif
#if !defined(TESTTIME) && !defined(TZINFO2SQL)
/*
This class represents abstract time zone and provides
basic interface for TIME <-> my_time_t conversion.
Actual time zones which are specified by DB, or via offset
or use system functions are its descendants.
*/
class Time_zone: public Sql_alloc
{
public:
/*
Converts local time in broken down TIME representation to
my_time_t (UTC seconds since Epoch) represenation.
Returns 0 in case of error. Sets in_dst_time_gap to true if date provided
falls into spring time-gap (or lefts it untouched otherwise).
*/
virtual my_time_t TIME_to_gmt_sec(const TIME *t,
bool *in_dst_time_gap) const = 0;
/*
Converts time in my_time_t representation to local time in
broken down TIME representation.
*/
virtual void gmt_sec_to_TIME(TIME *tmp, my_time_t t) const = 0;
/*
Because of constness of String returned by get_name() time zone name
have to be already zeroended to be able to use String::ptr() instead
of c_ptr().
*/
virtual const String * get_name() const = 0;
/*
We need this only for surpressing warnings, objects of this type are
allocated on MEM_ROOT and should not require destruction.
*/
virtual ~Time_zone() {};
};
extern Time_zone * my_tz_UTC;
extern Time_zone * my_tz_SYSTEM;
extern TABLE_LIST * my_tz_get_table_list(THD *thd);
extern Time_zone * my_tz_find(const String *name, TABLE_LIST *tz_tables);
extern my_bool my_tz_init(THD *org_thd, const char *default_tzname, my_bool bootstrap);
extern void my_tz_free();
/*
Check if we have pointer to the begining of list of implicitly used time
zone tables, set SELECT_ACL for them and fast-forward to its end.
SYNOPSIS
my_tz_check_n_skip_implicit_tables()
table - (in/out) pointer to element of table list to check
tz_tables - list of implicitly used time zone tables received
from my_tz_get_table_list() function.
NOTE
This function relies on my_tz_get_table_list() implementation.
RETURN VALUE
TRUE - if table points to the beggining of tz_tables list
FALSE - otherwise.
*/
inline bool my_tz_check_n_skip_implicit_tables(TABLE_LIST **table,
TABLE_LIST *tz_tables)
{
if (*table == tz_tables)
{
for (int i= 0; i < 4; i++)
(*table)[i].grant.privilege= SELECT_ACL;
(*table)+= 3;
return TRUE;
}
return FALSE;
}
/*
Maximum length of time zone name that we support
(Time zone name is char(64) in db)
*/
#define MAX_TIME_ZONE_NAME_LENGTH 72
#endif /* !defined(TESTTIME) && !defined(TZINFO2SQL) */
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