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<?php
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/**
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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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 3 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, see <http://www.gnu.org/licenses/>.
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 */
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/**
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 * UpgradeHelper.php
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 *
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 * @category     Core
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 * @package      Core_Upgrade
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 * @copyright    Werner v.d.Decken <wkl@isteam.de>
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 * @author       Werner v.d.Decken <wkl@isteam.de>
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 * @license      http://www.gnu.org/licenses/gpl.html   GPL License
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 * @version      0.0.1
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 * @revision     $Revision: $
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 * @link         $HeadURL: $
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 * @lastmodified $Date: $
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 * @since        File available since 17.03.2013
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 * @description  some helper function for upgrade-script.php
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 */
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class UpgradeHelper {
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/**
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 * Compare available tables against a list of tables
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 * @param  array list of needed table names without TablePrefix
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 * @return array list of missing tables
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 * @description this method is the replaement for self::existsAllTables()
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 */
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	public static function getMissingTables(array $aTablesList)
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	{
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		$aTablesList = array_flip($aTablesList);
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		$oDb = WbDatabase::getInstance();
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		$sPattern = addcslashes ( $oDb->TablePrefix, '%_' );
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		if(($oTables = $oDb->query( 'SHOW TABLES LIKE "'.$sPattern.'%"'))) {
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			while($aTable = $oTables->fetchRow(MYSQL_NUM)) {
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				$sTable =  preg_replace('/^'.preg_quote($oDb->TablePrefix, '/').'/s', '', $aTable[0]);
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				if(isset($aTablesList[$sTable])) {
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					unset($aTablesList[$sTable]);
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				}
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			}
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		}
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		return array_flip($aTablesList);
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	}
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/**
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 * Alias for self::getMissingTables()
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 * @param array list of needed table names without TablePrefix
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 * @return array list of missing tables
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 */
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	public static function existsAllTables(array $aTablesList)
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	{
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		return self::getMissingTables($aTablesList);
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	}
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} // end of class UpgradeHelper
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