<?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>
* @api
class DelegatingEngine implements EngineInterface, StreamingEngineInterface
{
* @var EngineInterface[]
protected $engines;
* Constructor.
* @param EngineInterface[] $engines An array of EngineInterface instances to add
public function __construct(array $engines = array())
$this->engines = array();
foreach ($engines as $engine) {
$this->addEngine($engine);
}
* {@inheritdoc}
public function render($name, array $parameters = array())
return $this->getEngine($name)->render($name, $parameters);
public function stream($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, $parameters);
public function exists($name)
return $this->getEngine($name)->exists($name);
* Adds an engine.
* @param EngineInterface $engine An EngineInterface instance
public function addEngine(EngineInterface $engine)
$this->engines[] = $engine;
public function supports($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));