CHIEFSOFT\ameye
91 lines
2.2 KiB
PHP
91 lines
2.2 KiB
PHP
<?php
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/**
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* @file classes/db/DAORegistry.php
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*
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* Copyright (c) 2014-2021 Simon Fraser University
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* Copyright (c) 2000-2021 John Willinsky
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* Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
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*
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* @class DAORegistry
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*
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* @ingroup db
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*
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* @see DAO
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*
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* @brief Maintains a static list of DAO objects so each DAO is instantiated only once.
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*/
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namespace PKP\db;
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use APP\core\Application;
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use PKP\core\Registry;
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class DAORegistry
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{
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/**
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* Get the current list of registered DAOs.
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* This returns a reference to the static hash used to
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* store all DAOs currently instantiated by the system.
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*
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* @return array
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*/
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public static function &getDAOs()
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{
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$daos = & Registry::get('daos', true, []);
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return $daos;
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}
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/**
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* Register a new DAO with the system.
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*
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* @param string $name The name of the DAO to register
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* @param object $dao A reference to the DAO to be registered
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*
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* @return object A reference to previously-registered DAO of the same
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* name, if one was already registered; null otherwise
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*/
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public static function registerDAO($name, $dao)
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{
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$daos = & DAORegistry::getDAOs();
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$returner = null;
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if (isset($daos[$name])) {
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$returner = $daos[$name];
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}
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$daos[$name] = $dao;
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return $returner;
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}
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/**
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* Retrieve a reference to the specified DAO.
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*
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* @param string $name the class name of the requested DAO
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*
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* @return DAO
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*/
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public static function &getDAO($name)
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{
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$daos = & DAORegistry::getDAOs();
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if (!isset($daos[$name])) {
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// Import the required DAO class.
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$application = Application::get();
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$className = $application->getQualifiedDAOName($name);
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if (!$className) {
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throw new \Exception('Unrecognized DAO ' . $name . '!');
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}
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// Only instantiate each class of DAO a single time
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$daos[$name] = new $className();
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}
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return $daos[$name];
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}
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}
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if (!PKP_STRICT_MODE) {
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class_alias('\PKP\db\DAORegistry', '\DAORegistry');
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}
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