Drizzled Public API Documentation

numhybrid.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/func.h>
00023 
00024 namespace drizzled
00025 {
00026 
00027 class Item_func_numhybrid: public Item_func
00028 {
00029 protected:
00030   Item_result hybrid_type;
00031 public:
00032   Item_func_numhybrid(): Item_func(), hybrid_type(REAL_RESULT)
00033   {}
00034   Item_func_numhybrid(Item *a) :Item_func(a), hybrid_type(REAL_RESULT)
00035   {}
00036   Item_func_numhybrid(Item *a,Item *b)
00037     :Item_func(a,b), hybrid_type(REAL_RESULT)
00038   {}
00039   Item_func_numhybrid(List<Item> &list)
00040     :Item_func(list), hybrid_type(REAL_RESULT)
00041   {}
00042 
00043   enum Item_result result_type () const { return hybrid_type; }
00044   void fix_length_and_dec();
00045   void fix_num_length_and_dec();
00046   virtual void find_num_type()= 0; /* To be called from fix_length_and_dec */
00047 
00048   double val_real();
00049   int64_t val_int();
00050   type::Decimal *val_decimal(type::Decimal *);
00051   String *val_str(String*str);
00052 
00059   virtual int64_t int_op()= 0;
00060 
00067   virtual double real_op()= 0;
00068 
00079   virtual type::Decimal *decimal_op(type::Decimal *)= 0;
00080 
00087   virtual String *str_op(String *)= 0;
00088   bool is_null() { update_null_value(); return null_value; }
00089 };
00090 
00091 } /* namespace drizzled */
00092