+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Lazy loads the runtime implementations for a Twig element.
+ *
+ * @author Robin Chalas <robin.chalas@gmail.com>
+ */
+class Twig_FactoryRuntimeLoader implements Twig_RuntimeLoaderInterface
+{
+ private $map;
+
+ /**
+ * @param array $map An array where keys are class names and values factory callables
+ */
+ public function __construct($map = array())
+ {
+ $this->map = $map;
+ }
+
+ public function load($class)
+ {
+ if (isset($this->map[$class])) {
+ $runtimeFactory = $this->map[$class];
+
+ return $runtimeFactory();
+ }
+ }
+}