642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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1999.6.1
by kalebral at gmail
update Copyright strings to a more common format to help with creating the master debian copyright file |
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* Copyright (C) 2008 Sun Microsystems, Inc.
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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef DRIZZLED_ITEM_CACHE_H
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#define DRIZZLED_ITEM_CACHE_H
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2154.2.4
by Brian Aker
This fixes 716459 |
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#include <drizzled/item/basic_constant.h> |
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#include <drizzled/item/field.h> |
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#include <drizzled/item/ident.h> |
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#include <drizzled/type/decimal.h> |
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#include <drizzled/util/test.h> |
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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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1280.1.10
by Monty Taylor
Put everything in drizzled into drizzled namespace. |
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namespace drizzled |
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{
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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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class Item_cache: public Item_basic_constant |
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{
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protected: |
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Item *example; |
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table_map used_table_map; |
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/*
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Field that this object will get value from. This is set/used by
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index-based subquery engines to detect and remove the equality injected
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by IN->EXISTS transformation.
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For all other uses of Item_cache, cached_field doesn't matter.
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*/
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Field *cached_field; |
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enum enum_field_types cached_field_type; |
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public: |
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Item_cache(): |
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example(0), used_table_map(0), cached_field(0), cached_field_type(DRIZZLE_TYPE_VARCHAR) |
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{
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fixed= 1; |
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null_value= 1; |
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}
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Item_cache(enum_field_types field_type_arg): |
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example(0), used_table_map(0), cached_field(0), cached_field_type(field_type_arg) |
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{
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fixed= 1; |
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null_value= 1; |
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}
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void set_used_tables(table_map map) { used_table_map= map; } |
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virtual bool allocate(uint32_t) |
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{ return 0; } |
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virtual bool setup(Item *item) |
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{
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example= item; |
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max_length= item->max_length; |
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decimals= item->decimals; |
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collation.set(item->collation); |
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unsigned_flag= item->unsigned_flag; |
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if (item->type() == FIELD_ITEM) |
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cached_field= ((Item_field *)item)->field; |
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return 0; |
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};
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virtual void store(Item *)= 0; |
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enum Type type() const { return CACHE_ITEM; } |
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enum_field_types field_type() const { return cached_field_type; } |
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static Item_cache* get_cache(const Item *item); |
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table_map used_tables() const { return used_table_map; } |
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virtual void keep_array() {} |
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2215.2.1
by Stewart Smith
remove enum_query_type which was effectively unused. It was set to one value once, compared to it once (i.e. always true) and passed around everywhere doing nothing. |
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virtual void print(String *str); |
642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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bool eq_def(Field *field); |
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bool eq(const Item *item, bool) const |
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{
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return this == item; |
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}
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1240.8.9
by Dennis Schoen
add basic_const_item() to Item_cache and Item_ref |
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bool basic_const_item() const |
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{
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return test(example && example->basic_const_item()); |
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}
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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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};
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1280.1.10
by Monty Taylor
Put everything in drizzled into drizzled namespace. |
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} /* namespace drizzled */ |
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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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#endif /* DRIZZLED_ITEM_CACHE_H */ |