3 namespace Org\Mxchange\CoreFramework\Registry\Upgrade\Format\Lfdb;
5 * A LocalFileDatabase database-format-upgrade registry
7 * @author Roland Haeder <webmaster@ship-simu.org>
9 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2016 Core Developer Team
10 * @license GNU GPL 3.0 or any newer version
11 * @link http://www.ship-simu.org
13 * This program is free software: you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation, either version 3 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 class LocalFileDatabaseFormatUpgradeRegistry extends BaseRegistry implements RegisterableFormatUpgrade {
28 * Instance of this class
30 private static $registryInstance = null;
33 * Protected constructor
37 protected function __construct () {
38 // Call parent constructor
39 parent::__construct(__CLASS__);
43 * Singleton getter for self instance. This class has no factory pattern
44 * because here is no need for special parameters.
46 * @return $registryInstance Instance of this class
48 public final static function getRegistry () {
49 // Is an instance there?
50 if (is_null(self::$registryInstance)) {
51 // Not yet, so create one
52 self::$registryInstance = new LocalFileDatabaseFormatUpgradeRegistry();
55 // Return the instance
56 return self::$registryInstance;