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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\Templating;
- /**
- * DelegatingEngine selects an engine for a given template.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
- class DelegatingEngine implements EngineInterface, StreamingEngineInterface
- {
- /**
- * @var EngineInterface[]
- */
- protected $engines = array();
- /**
- * Constructor.
- *
- * @param EngineInterface[] $engines An array of EngineInterface instances to add
- */
- public function __construct(array $engines = array())
- {
- foreach ($engines as $engine) {
- $this->addEngine($engine);
- }
- }
- /**
- * {@inheritdoc}
- */
- public function render($name, array $parameters = array())
- {
- return $this->getEngine($name)->render($name, $parameters);
- }
- /**
- * {@inheritdoc}
- */
- public function stream($name, array $parameters = array())
- {
- $engine = $this->getEngine($name);
- if (!$engine instanceof StreamingEngineInterface) {
- throw new \LogicException(sprintf('Template "%s" cannot be streamed as the engine supporting it does not implement StreamingEngineInterface.', $name));
- }
- $engine->stream($name, $parameters);
- }
- /**
- * {@inheritdoc}
- */
- public function exists($name)
- {
- return $this->getEngine($name)->exists($name);
- }
- /**
- * Adds an engine.
- *
- * @param EngineInterface $engine An EngineInterface instance
- */
- public function addEngine(EngineInterface $engine)
- {
- $this->engines[] = $engine;
- }
- /**
- * {@inheritdoc}
- */
- public function supports($name)
- {
- try {
- $this->getEngine($name);
- } catch (\RuntimeException $e) {
- return false;
- }
- return true;
- }
- /**
- * Get an engine able to render the given template.
- *
- * @param string|TemplateReferenceInterface $name A template name or a TemplateReferenceInterface instance
- *
- * @return EngineInterface The engine
- *
- * @throws \RuntimeException if no engine able to work with the template is found
- */
- public function getEngine($name)
- {
- foreach ($this->engines as $engine) {
- if ($engine->supports($name)) {
- return $engine;
- }
- }
- throw new \RuntimeException(sprintf('No engine is able to work with the template "%s".', $name));
- }
- }
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