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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, Inc.
*
* 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/error.h>
#include <drizzled/function/get_system_var.h>
#include <drizzled/session.h>
#include <drizzled/sys_var.h>
#include <drizzled/sql_lex.h>
namespace drizzled {
Item_func_get_system_var::
Item_func_get_system_var(sys_var *var_arg, sql_var_t var_type_arg,
lex_string_t *component_arg, const char *name_arg,
size_t name_len_arg)
:var(var_arg), var_type(var_type_arg), component(*component_arg)
{
/* set_name() will allocate the name */
set_name(name_arg, name_len_arg);
}
bool
Item_func_get_system_var::fix_fields(Session *session, Item **ref)
{
/*
Evaluate the system variable and substitute the result (a basic constant)
instead of this item. If the variable can not be evaluated,
the error is reported in sys_var::item().
*/
Item *item= var->item(session, var_type, &component);
if (not item)
return 1; // Impossible
item->set_name(name, 0); // don't allocate a new name
*ref= item;
return 0;
}
Item *get_system_var(Session *session, sql_var_t var_type, lex_string_t name,
lex_string_t component)
{
sys_var *var;
lex_string_t *base_name, *component_name;
if (component.str)
{
base_name= &component;
component_name= &name;
}
else
{
base_name= &name;
component_name= &component; // Empty string
}
if (!(var= find_sys_var(base_name->str)))
return 0;
if (component.str)
{
my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
return 0;
}
session->lex().setCacheable(false);
set_if_smaller(component_name->length, (size_t)MAX_SYS_VAR_LENGTH);
return new Item_func_get_system_var(var, var_type, component_name,
NULL, 0);
}
} /* namespace drizzled */
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