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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/function/time/date_add_interval.h"
#include "drizzled/temporal_interval.h"
#include "drizzled/time_functions.h"
namespace drizzled
{
/*
'interval_names' reflects the order of the enumeration interval_type.
See item/time.h
*/
const char *interval_names[]=
{
"year", "quarter", "month", "week", "day",
"hour", "minute", "second", "microsecond",
"year_month", "day_hour", "day_minute",
"day_second", "hour_minute", "hour_second",
"minute_second", "day_microsecond",
"hour_microsecond", "minute_microsecond",
"second_microsecond"
};
void Item_date_add_interval::fix_length_and_dec()
{
enum_field_types arg0_field_type;
collation.set(&my_charset_bin);
maybe_null=1;
max_length=DateTime::MAX_STRING_LENGTH*MY_CHARSET_BIN_MB_MAXLEN;
value.alloc(max_length);
/*
The field type for the result of an Item_date function is defined as
follows:
- If first arg is a DRIZZLE_TYPE_DATETIME result is DRIZZLE_TYPE_DATETIME
- If first arg is a DRIZZLE_TYPE_DATE and the interval type uses hours,
minutes or seconds then type is DRIZZLE_TYPE_DATETIME.
- Otherwise the result is DRIZZLE_TYPE_VARCHAR
(This is because you can't know if the string contains a DATE, DRIZZLE_TIME or
DATETIME argument)
*/
cached_field_type= DRIZZLE_TYPE_VARCHAR;
arg0_field_type= args[0]->field_type();
if (arg0_field_type == DRIZZLE_TYPE_DATETIME ||
arg0_field_type == DRIZZLE_TYPE_TIMESTAMP)
cached_field_type= DRIZZLE_TYPE_DATETIME;
else if (arg0_field_type == DRIZZLE_TYPE_DATE)
{
if (int_type <= INTERVAL_DAY || int_type == INTERVAL_YEAR_MONTH)
cached_field_type= arg0_field_type;
else
cached_field_type= DRIZZLE_TYPE_DATETIME;
}
}
/* Here arg[1] is a Item_interval object */
bool Item_date_add_interval::get_date(DRIZZLE_TIME *ltime, uint32_t )
{
TemporalInterval interval;
if (args[0]->get_date(ltime, TIME_NO_ZERO_DATE))
return (null_value= true);
if (interval.initFromItem(args[1], int_type, &value))
return (null_value= true);
if (date_sub_interval)
interval.toggleNegative();
if ((null_value= interval.addDate(ltime, int_type)))
return true;
return false;
}
String *Item_date_add_interval::val_str(String *str)
{
assert(fixed == 1);
DRIZZLE_TIME ltime;
if (Item_date_add_interval::get_date(<ime, TIME_NO_ZERO_DATE))
return 0;
if (ltime.time_type == DRIZZLE_TIMESTAMP_DATE)
make_date(<ime, str);
else if (ltime.second_part)
{
/* Ensure we've got enough room for our timestamp string. */
str->length(DateTime::MAX_STRING_LENGTH);
size_t length= snprintf(str->c_ptr(), DateTime::MAX_STRING_LENGTH,
"%04u-%02u-%02u %02u:%02u:%02u.%06u",
ltime.year,
ltime.month,
ltime.day,
ltime.hour,
ltime.minute,
ltime.second,
(uint32_t) ltime.second_part);
str->length(length);
str->set_charset(&my_charset_bin);
}
else
make_datetime(<ime, str);
return str;
}
int64_t Item_date_add_interval::val_int()
{
assert(fixed == 1);
DRIZZLE_TIME ltime;
int64_t date;
if (Item_date_add_interval::get_date(<ime, TIME_NO_ZERO_DATE))
return (int64_t) 0;
date = (ltime.year*100L + ltime.month)*100L + ltime.day;
return ltime.time_type == DRIZZLE_TIMESTAMP_DATE ? date :
((date*100L + ltime.hour)*100L+ ltime.minute)*100L + ltime.second;
}
bool Item_date_add_interval::eq(const Item *item, bool binary_cmp) const
{
Item_date_add_interval *other= (Item_date_add_interval*) item;
if (!Item_func::eq(item, binary_cmp))
return 0;
return ((int_type == other->int_type) &&
(date_sub_interval == other->date_sub_interval));
}
void Item_date_add_interval::print(String *str, enum_query_type query_type)
{
str->append('(');
args[0]->print(str, query_type);
str->append(date_sub_interval?" - interval ":" + interval ");
args[1]->print(str, query_type);
str->append(' ');
str->append(interval_names[int_type]);
str->append(')');
}
} /* namespace drizzled */
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