diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Templating/DelegatingEngine.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Templating/DelegatingEngine.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,125 @@
+<?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
+{
+    protected $engines;
+
+    /**
+     * Constructor.
+     *
+     * @param array $engines An array of EngineInterface instances to add
+     *
+     * @api
+     */
+    public function __construct(array $engines = array())
+    {
+        $this->engines = array();
+        foreach ($engines as $engine) {
+            $this->addEngine($engine);
+        }
+    }
+
+    /**
+     * Renders a template.
+     *
+     * @param mixed $name       A template name or a TemplateReferenceInterface instance
+     * @param array $parameters An array of parameters to pass to the template
+     *
+     * @return string The evaluated template as a string
+     *
+     * @throws \InvalidArgumentException if the template does not exist
+     * @throws \RuntimeException         if the template cannot be rendered
+     *
+     * @api
+     */
+    public function render($name, array $parameters = array())
+    {
+        return $this->getEngine($name)->render($name, $parameters);
+    }
+
+    /**
+     * Returns true if the template exists.
+     *
+     * @param mixed $name A template name or a TemplateReferenceInterface instance
+     *
+     * @return Boolean true if the template exists, false otherwise
+     *
+     * @api
+     */
+    public function exists($name)
+    {
+        return $this->getEngine($name)->exists($name);
+    }
+
+    /**
+     * Adds an engine.
+     *
+     * @param EngineInterface $engine An EngineInterface instance
+     *
+     * @api
+     */
+    public function addEngine(EngineInterface $engine)
+    {
+        $this->engines[] = $engine;
+    }
+
+    /**
+     * Returns true if this class is able to render the given template.
+     *
+     * @param mixed $name A template name or a TemplateReferenceInterface instance
+     *
+     * @return Boolean true if this class supports the given template, false otherwise
+     *
+     * @api
+     */
+    public function supports($name)
+    {
+        try {
+            $this->getEngine($name);
+        } catch (\RuntimeException $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Get an engine able to render the given template.
+     *
+     * @param mixed $name A template name or a TemplateReferenceInterface instance
+     *
+     * @return EngineInterface The engine
+     *
+     * @throws \RuntimeException if no engine able to work with the template is found
+     *
+     * @api
+     */
+    protected function getEngine($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));
+    }
+}