Drizzled Public API Documentation

make_set.h

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 #pragma once
00021 
00022 #include <drizzled/function/str/strfunc.h>
00023 
00024 namespace drizzled
00025 {
00026 
00027 class Item_func_make_set :public Item_str_func
00028 {
00029   Session &session;
00030   Item *item;
00031   String tmp_str;
00032 
00033 public:
00034   using Item::split_sum_func;
00035   Item_func_make_set(Session &session_arg, Item *a, List<Item> &list) :
00036     Item_str_func(list), 
00037     session(session_arg),
00038     item(a) {}
00039   String *val_str(String *str);
00040   bool fix_fields(Session *session_arg, Item **ref)
00041   {
00042     assert(fixed == 0);
00043     return ((!item->fixed && item->fix_fields(session_arg, &item)) ||
00044             item->check_cols(1) ||
00045             Item_func::fix_fields(session_arg, ref));
00046   }
00047   void split_sum_func(Session *session_arg, Item **ref_pointer_array, List<Item> &fields);
00048   void fix_length_and_dec();
00049   void update_used_tables();
00050   const char *func_name() const { return "make_set"; }
00051 
00052   bool walk(Item_processor processor, bool walk_subquery, unsigned char *arg)
00053   {
00054     return item->walk(processor, walk_subquery, arg) ||
00055       Item_str_func::walk(processor, walk_subquery, arg);
00056   }
00057   Item *transform(Item_transformer transformer, unsigned char *arg);
00058   virtual void print(String *str);
00059 };
00060 
00061 } /* namespace drizzled */
00062