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<?php
/**
* Final class SimpleServiceContainer.
*
* @link https://www.mwpd.io/
*
* @copyright 2019 Alain Schlesser
* @license MIT
*/
/**
* Original code modified for this project.
*
* @copyright 2021 Google LLC
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
*/
declare(strict_types = 1);
namespace Google\Web_Stories\Infrastructure\ServiceContainer;
use ArrayObject;
use Google\Web_Stories\Exception\InvalidService;
use Google\Web_Stories\Infrastructure\Service;
use Google\Web_Stories\Infrastructure\ServiceContainer;
/**
* A simplified implementation of a service container.
*
* We extend ArrayObject so we have default implementations for iterators and
* array access.
*
* @internal
*
* @since 1.6.0
*/
final class SimpleServiceContainer extends ArrayObject implements ServiceContainer {
/**
* Find a service of the container by its identifier and return it.
*
* @since 1.6.0
*
* @throws InvalidService If the service could not be found.
*
* @param string $id Identifier of the service to look for.
* @return Service Service that was requested.
*/
public function get( string $id ): Service {
if ( ! $this->has( $id ) ) {
throw InvalidService::from_service_id( $id ); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
}
/**
* Service.
*
* @var Service $service Service.
*/
$service = $this->offsetGet( $id );
// Instantiate actual services if they were stored lazily.
if ( $service instanceof LazilyInstantiatedService ) {
$service = $service->instantiate();
$this->put( $id, $service );
}
return $service;
}
/**
* Check whether the container can return a service for the given
* identifier.
*
* @since 1.6.0
*
* @param string $id Identifier of the service to look for.
*/
public function has( string $id ): bool {
return $this->offsetExists( $id );
}
/**
* Put a service into the container for later retrieval.
*
* @since 1.6.0
*
* @param string $id Identifier of the service to put into the
* container.
* @param Service $service Service to put into the container.
*/
public function put( string $id, Service $service ): void {
$this->offsetSet( $id, $service );
}
}