~drizzle-trunk/drizzle/development

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2010 Brian Aker

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include "config.h"

#include "plugin/show_dictionary/dictionary.h"

#include "drizzled/identifier.h"

using namespace std;

using namespace drizzled;

ShowIndexes::ShowIndexes() :

  show_dictionary::Show("SHOW_INDEXES")

{

  add_field("Table");

  add_field("Unique", plugin::TableFunction::BOOLEAN, 0, false);

  add_field("Key_name");

  add_field("Seq_in_index", plugin::TableFunction::NUMBER, 0, false);

  add_field("Column_name");

}

ShowIndexes::Generator::Generator(Field **arg) :

  show_dictionary::Show::Generator(arg),

  is_tables_primed(false),

  is_index_primed(false),

  is_index_part_primed(false),

  index_iterator(0),

  index_part_iterator(0)

{

  if (not isShowQuery())

    return;

  statement::Show *select= static_cast<statement::Show *>(getSession().lex->statement);

  if (not select->getShowTable().empty() && not select->getShowSchema().empty())

  {

    table_name.append(select->getShowTable().c_str());

    TableIdentifier identifier(select->getShowSchema().c_str(), select->getShowTable().c_str());

    is_tables_primed= plugin::StorageEngine::getTableDefinition(getSession(),

                                                                identifier,

                                                                table_proto);

  }

}

bool ShowIndexes::Generator::nextIndexCore()

{

  if (isIndexesPrimed())

  {

    index_iterator++;

  }

  else

  {

    if (not isTablesPrimed())

      return false;

    index_iterator= 0;

    is_index_primed= true;

  }

  if (index_iterator >= getTableProto().indexes_size())

    return false;

  index= getTableProto().indexes(index_iterator);

  return true;

}

bool ShowIndexes::Generator::nextIndex()

{

  while (not nextIndexCore())

  {

    return false;

  }

  return true;

}

bool ShowIndexes::Generator::nextIndexPartsCore()

{

  if (is_index_part_primed)

  {

    index_part_iterator++;

  }

  else

  {

    if (not isIndexesPrimed())

      return false;

    index_part_iterator= 0;

    is_index_part_primed= true;

  }

  if (index_part_iterator >= getIndex().index_part_size())

    return false;

  index_part= getIndex().index_part(index_part_iterator);

  return true;

}

bool ShowIndexes::Generator::nextIndexParts()

{

  while (not nextIndexPartsCore())

  {

    if (not nextIndex())

      return false;

    is_index_part_primed= false;

  }

  return true;

}

bool ShowIndexes::Generator::populate()

{

  if (not nextIndexParts())

    return false;

  fill();

  return true;

}

void ShowIndexes::Generator::fill()

{

  /* Table */

  push(getTableName());

  /* Unique */

  push(getIndex().is_unique());

  /* Key_name */

  push(getIndex().name());

  /* Seq_in_index */

  push(static_cast<int64_t>(index_part_iterator + 1));

  /* Column_name */

  push(getTableProto().field(getIndexPart().fieldnr()).name());

}