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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Form\ChoiceList\Factory; use Symfony\Component\Form\ChoiceList\ChoiceListInterface; use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface; use Symfony\Component\Form\ChoiceList\View\ChoiceListView; use Symfony\Contracts\Service\ResetInterface; /** * Caches the choice lists created by the decorated factory. * * @author Bernhard Schussek <bschussek@gmail.com> */ class CachingFactoryDecorator implements ChoiceListFactoryInterface, ResetInterface { private $decoratedFactory; /** * @var ChoiceListInterface[] */ private $lists = []; /** * @var ChoiceListView[] */ private $views = []; /** * Generates a SHA-256 hash for the given value. * * Optionally, a namespace string can be passed. Calling this method will * the same values, but different namespaces, will return different hashes. * * @param mixed $value The value to hash * * @return string The SHA-256 hash * * @internal */ public static function generateHash($value, string $namespace = ''): string { if (\is_object($value)) { $value = spl_object_hash($value); } elseif (\is_array($value)) { array_walk_recursive($value, function (&$v) { if (\is_object($v)) { $v = spl_object_hash($v); } }); } return hash('sha256', $namespace.':'.serialize($value)); } public function __construct(ChoiceListFactoryInterface $decoratedFactory) { $this->decoratedFactory = $decoratedFactory; } /** * Returns the decorated factory. * * @return ChoiceListFactoryInterface The decorated factory */ public function getDecoratedFactory() { return $this->decoratedFactory; } /** * {@inheritdoc} */ public function createListFromChoices($choices, $value = null) { if ($choices instanceof \Traversable) { $choices = iterator_to_array($choices); } // The value is not validated on purpose. The decorated factory may // decide which values to accept and which not. $hash = self::generateHash([$choices, $value], 'fromChoices'); if (!isset($this->lists[$hash])) { $this->lists[$hash] = $this->decoratedFactory->createListFromChoices($choices, $value); } return $this->lists[$hash]; } /** * {@inheritdoc} */ public function createListFromLoader(ChoiceLoaderInterface $loader, $value = null) { $hash = self::generateHash([$loader, $value], 'fromLoader'); if (!isset($this->lists[$hash])) { $this->lists[$hash] = $this->decoratedFactory->createListFromLoader($loader, $value); } return $this->lists[$hash]; } /** * {@inheritdoc} */ public function createView(ChoiceListInterface $list, $preferredChoices = null, $label = null, $index = null, $groupBy = null, $attr = null) { // The input is not validated on purpose. This way, the decorated // factory may decide which input to accept and which not. $hash = self::generateHash([$list, $preferredChoices, $label, $index, $groupBy, $attr]); if (!isset($this->views[$hash])) { $this->views[$hash] = $this->decoratedFactory->createView( $list, $preferredChoices, $label, $index, $groupBy, $attr ); } return $this->views[$hash]; } public function reset() { $this->lists = []; $this->views = []; } }