5 * @author Roland Haeder <webmaster@ship-simu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009, 2010 Core Developer Team
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.ship-simu.org
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 class BaseRegistry extends BaseFrameworkSystem implements Registerable {
26 * Instance of this class
28 private static $registryInstance = null;
33 private $instanceRegistry = array();
36 * Protected constructor
38 * @param $className Name of the class
41 protected function __construct ($className) {
42 // Call parent constructor
43 parent::__construct($className);
47 * Checks wether an instance key was found
49 * @param $instanceKey The key holding an instance in registry
50 * @return $exists Wether the key exists in registry
52 public function instanceExists ($instanceKey) {
53 // Does this key exists?
54 $exists = (isset($this->instanceRegistry[$instanceKey]));
61 * Adds/overwrites a new instance to the registry at the given key
63 * @param $instanceKey The key to identify the instance
64 * @param $objectInstance An instance we shall store
67 public function addInstance ($instanceKey, Registerable $objectInstance) {
68 $this->instanceRegistry[$instanceKey] = $objectInstance;
72 * Gets a registered instance or null if not found
74 * @param $instanceKey The key to identify the instance
75 * @return $objectInstance An instance we shall store
76 * @throws NullPointerException If the requested key is not found
78 public function getInstance ($instanceKey) {
79 // By default the instance is not in registry
80 $objectInstance = null;
82 // Is the instance there?
83 if ($this->instanceExists($instanceKey)) {
84 $objectInstance = $this->instanceRegistry[$instanceKey];
88 if (is_null($objectInstance)) {
89 // This might happen if a non-registered key was requested
90 throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
94 return $objectInstance;