Drizzled Public API Documentation

outer_ref.cc

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #include <config.h>
00021 
00022 #include <drizzled/item/uint.h>
00023 #include <drizzled/item/outer_ref.h>
00024 
00025 namespace drizzled
00026 {
00027 
00028 /*
00029   Prepare referenced outer field then call usual Item_direct_ref::fix_fields
00030 
00031   SYNOPSIS
00032     Item_outer_ref::fix_fields()
00033     session         thread handler
00034     reference   reference on reference where this item stored
00035 
00036   RETURN
00037     false   OK
00038     true    Error
00039 */
00040 
00041 bool Item_outer_ref::fix_fields(Session *session, Item **reference)
00042 {
00043   bool err;
00044   /* outer_ref->check_cols() will be made in Item_direct_ref::fix_fields */
00045   if ((*ref) && !(*ref)->fixed && ((*ref)->fix_fields(session, reference)))
00046     return true;
00047   err= Item_direct_ref::fix_fields(session, reference);
00048   if (!outer_ref)
00049     outer_ref= *ref;
00050   if ((*ref)->type() == Item::FIELD_ITEM)
00051     table_name= ((Item_field*)outer_ref)->table_name;
00052   return err;
00053 }
00054 
00055 void Item_outer_ref::fix_after_pullout(Select_Lex *new_parent,
00056                                        Item **ref_item)
00057 {
00058   if (depended_from == new_parent)
00059   {
00060     *ref_item= outer_ref;
00061     outer_ref->fix_after_pullout(new_parent, ref_item);
00062   }
00063 }
00064 
00065 
00066 } /* namespace drizzled */