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<?php
/**
* @file classes/core/PKPServices.inc.php
*
* Copyright (c) 2014-2021 Simon Fraser University
* Copyright (c) 2000-2021 John Willinsky
* Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
*
* @class PKPServices
* @ingroup core
* @see Core
*
* @brief Pimple Dependency Injection Container.
*/
abstract class PKPServices {
/** @var Pimple\Container Pimple Dependency Injection Container */
private static $instance = null;
protected $container = null;
/**
* private constructor
*/
private function __construct() {
$this->container = new Pimple\Container();
$this->init();
}
/**
* container initialization
*/
abstract protected function init();
/**
* A static method to register a service
* @param string $service
*/
public static function register(Pimple\ServiceProviderInterface $service) {
self::_instance()->container->register($service);
}
/**
* A static method to get a service
* @param string $service
*/
public static function get($service) {
return self::_instance()->_getFromContainer($service);
}
/**
* Returns the instance of the container
*/
private static function _instance() {
if (is_null(self::$instance)) {
self::$instance = new Services();
}
return self::$instance;
}
/**
* Gets the service from an instanced container.
* @param string $service
*/
private function _getFromContainer($service) {
return $this->container[$service];
}
}