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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 "drizzled/server_includes.h"
#include CSTDINT_H
#include "drizzled/temporal.h"
#include "drizzled/error.h"
#include "drizzled/function/time/year.h"
int64_t Item_func_year::val_int()
{
assert(fixed);
if (args[0]->is_null())
{
/* For NULL argument, we return a NULL result */
null_value= true;
return 0;
}
/* Grab the first argument as a DateTime object */
drizzled::DateTime temporal;
Item_result arg0_result_type= args[0]->result_type();
switch (arg0_result_type)
{
case STRING_RESULT:
{
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res= args[0]->val_str(&tmp);
if (! temporal.from_string(res->c_ptr(), res->length()))
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
return 0;
}
}
break;
case INT_RESULT:
if (temporal.from_int64_t(args[0]->val_int()))
break;
/* Intentionally fall-through on invalid conversion from integer */
default:
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
null_value= true;
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res;
res= args[0]->val_str(&tmp);
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
return 0;
}
}
return (int64_t) temporal.years();
}
/* information about this Item tree monotonicity
SYNOPSIS
Item_func_year::get_monotonicity_info()
DESCRIPTION
Get information about monotonicity of the function represented by this item
tree.
RETURN
See enum_monotonicity_info.
*/
enum_monotonicity_info Item_func_year::get_monotonicity_info() const
{
if (args[0]->type() == Item::FIELD_ITEM &&
(args[0]->field_type() == DRIZZLE_TYPE_DATE ||
args[0]->field_type() == DRIZZLE_TYPE_DATETIME))
return MONOTONIC_INCREASING;
return NON_MONOTONIC;
}
int64_t Item_func_year::val_int_endpoint(bool left_endp, bool *incl_endp)
{
assert(fixed == 1);
if (args[0]->is_null())
{
/* got NULL, leave the incl_endp intact */
return INT64_MIN;
}
/* Grab the first argument as a DateTime object */
drizzled::DateTime temporal;
if (! temporal.from_int64_t(args[0]->val_int()))
{
/* got bad DateTime, leave the incl_endp intact */
return INT64_MIN;
}
/*
Handle the special but practically useful case of datetime values that
point to year bound ("strictly less" comparison stays intact) :
col < '2007-01-01 00:00:00' -> YEAR(col) < 2007
which is different from the general case ("strictly less" changes to
"less or equal"):
col < '2007-09-15 23:00:00' -> YEAR(col) <= 2007
*/
if (!left_endp && temporal.days() == 1 && temporal.months() == 1 &&
! (temporal.hours() || temporal.minutes() || temporal.seconds() || temporal.useconds()))
; /* do nothing */
else
*incl_endp= true;
return (int64_t) temporal.years();
}
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