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by brian
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/* Copyright (C) 2004 MySQL AB
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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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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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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class interface */ |
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#endif
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#if !defined(TESTTIME) && !defined(TZINFO2SQL)
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/**
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This class represents abstract time zone and provides
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basic interface for MYSQL_TIME <-> my_time_t conversion.
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Actual time zones which are specified by DB, or via offset
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or use system functions are its descendants.
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*/
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class Time_zone: public Sql_alloc |
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{
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public: |
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Time_zone() {} /* Remove gcc warning */ |
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/**
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Converts local time in broken down MYSQL_TIME representation to
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my_time_t (UTC seconds since Epoch) represenation.
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Returns 0 in case of error. Sets in_dst_time_gap to true if date provided
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falls into spring time-gap (or lefts it untouched otherwise).
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*/
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virtual my_time_t TIME_to_gmt_sec(const MYSQL_TIME *t, |
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my_bool *in_dst_time_gap) const = 0; |
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/**
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Converts time in my_time_t representation to local time in
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broken down MYSQL_TIME representation.
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*/
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virtual void gmt_sec_to_TIME(MYSQL_TIME *tmp, my_time_t t) const = 0; |
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/**
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Because of constness of String returned by get_name() time zone name
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have to be already zeroended to be able to use String::ptr() instead
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of c_ptr().
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*/
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virtual const String * get_name() const = 0; |
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/**
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We need this only for surpressing warnings, objects of this type are
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allocated on MEM_ROOT and should not require destruction.
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*/
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virtual ~Time_zone() {}; |
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};
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extern Time_zone * my_tz_UTC; |
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extern Time_zone * my_tz_SYSTEM; |
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extern Time_zone * my_tz_OFFSET0; |
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extern Time_zone * my_tz_find(THD *thd, const String *name); |
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extern my_bool my_tz_init(THD *org_thd, const char *default_tzname, my_bool bootstrap); |
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extern void my_tz_free(); |
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extern my_time_t sec_since_epoch_TIME(MYSQL_TIME *t); |
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/**
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Number of elements in table list produced by my_tz_get_table_list()
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(this table list contains tables which are needed for dynamical loading
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of time zone descriptions). Actually it is imlementation detail that
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should not be used anywhere outside of tztime.h and tztime.cc.
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*/
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static const int MY_TZ_TABLES_COUNT= 4; |
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#endif /* !defined(TESTTIME) && !defined(TZINFO2SQL) */ |