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  • Committer: Padraig O'Sullivan
  • Date: 2010-04-17 00:31:41 UTC
  • mto: (1497.1.1 build)
  • mto: This revision was merged to the branch mainline in revision 1499.
  • Revision ID: osullivan.padraig@gmail.com-20100417003141-r2ipgkdh5wx1f95a
Added interface and various implementations to abstract out the concept of an access method. Also added a factory class for creating an instance of an access method.

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drizzled/optimizer/access_method_factory.cc
 
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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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 *  Copyright (C) 2010 Padraig O'Sullivan
 
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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; either version 2 of the License, or
 
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 *  (at your option) any later version.
 
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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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#include "drizzled/sql_select.h"
 
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#include "drizzled/join_table.h"
 
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#include "drizzled/optimizer/access_method.h"
 
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#include "drizzled/optimizer/access_method_factory.h"
 
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#include "drizzled/optimizer/access_method/system.h"
 
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#include "drizzled/optimizer/access_method/const.h"
 
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#include "drizzled/optimizer/access_method/unique_index.h"
 
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#include "drizzled/optimizer/access_method/index.h"
 
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#include "drizzled/optimizer/access_method/scan.h"
 
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using namespace drizzled;
 
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optimizer::AccessMethod *
 
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optimizer::AccessMethodFactory::createAccessMethod(enum access_method type)
 
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{
 
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  optimizer::AccessMethod *am_ret= NULL;
 
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  switch (type)
 
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  {
 
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  case AM_SYSTEM:
 
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    am_ret= new(std::nothrow) optimizer::System();
 
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    break;
 
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  case AM_CONST:
 
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    am_ret= new(std::nothrow) optimizer::Const();
 
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    break;
 
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  case AM_EQ_REF:
 
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    am_ret= new(std::nothrow) optimizer::UniqueIndex();
 
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    break;
 
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  case AM_REF_OR_NULL:
 
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  case AM_REF:
 
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    am_ret= new(std::nothrow) optimizer::Index();
 
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    break;
 
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  case AM_ALL:
 
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    am_ret= new(std::nothrow) optimizer::Scan();
 
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    break;
 
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  default:
 
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    break;
 
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  }
 
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  return am_ret;
 
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}
 
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