Drizzled Public API Documentation

hybrid_type_traits.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/common.h>
00023 #include <drizzled/item_result.h>
00024 
00025 namespace drizzled
00026 {
00027 
00028 class Item;
00029 class Field;
00030 class Hybrid_type;
00031 class String;
00032 
00033 namespace type {
00034 class Decimal;
00035 }
00036 
00037 /* Hybryd_type_traits interface + default implementation for REAL_RESULT */
00038 
00039 class Hybrid_type_traits
00040 {
00041 public:
00042 
00043   virtual Item_result type() const;
00044 
00045   virtual void
00046   fix_length_and_dec(Item *item, Item *arg) const;
00047 
00048   /* Hybrid_type operations. */
00049   virtual void set_zero(Hybrid_type *val) const;
00050   virtual void add(Hybrid_type *val, Field *f) const;
00051   virtual void div(Hybrid_type *val, uint64_t u) const;
00052 
00053   virtual int64_t val_int(Hybrid_type *val,
00054                           bool unsigned_flag) const;
00055   virtual double val_real(Hybrid_type *val) const;
00056   virtual type::Decimal *val_decimal(Hybrid_type *val, type::Decimal *buf) const;
00057   virtual String *val_str(Hybrid_type *val, String *buf,
00058                           uint8_t decimals) const;
00059 
00060   static const Hybrid_type_traits *instance();
00061   Hybrid_type_traits();
00062   virtual ~Hybrid_type_traits();
00063 
00064 };
00065 
00066 } /* namespace drizzled */
00067