--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/assetic/src/Assetic/Factory/Loader/CachedFormulaLoader.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * This file is part of the Assetic package, an OpenSky project.
+ *
+ * (c) 2010-2011 OpenSky Project Inc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Assetic\Factory\Loader;
+
+use Assetic\Cache\ConfigCache;
+use Assetic\Factory\Resource\IteratorResourceInterface;
+use Assetic\Factory\Resource\ResourceInterface;
+
+/**
+ * Adds a caching layer to a loader.
+ *
+ * A cached formula loader is a composition of a formula loader and a cache.
+ *
+ * @author Kris Wallsmith <kris.wallsmith@gmail.com>
+ */
+class CachedFormulaLoader implements FormulaLoaderInterface
+{
+    private $loader;
+    private $configCache;
+    private $debug;
+
+    /**
+     * Constructor.
+     *
+     * When the loader is in debug mode it will ensure the cached formulae
+     * are fresh before returning them.
+     *
+     * @param FormulaLoaderInterface $loader      A formula loader
+     * @param ConfigCache            $configCache A config cache
+     * @param Boolean                $debug       The debug mode
+     */
+    public function __construct(FormulaLoaderInterface $loader, ConfigCache $configCache, $debug = false)
+    {
+        $this->loader = $loader;
+        $this->configCache = $configCache;
+        $this->debug = $debug;
+    }
+
+    public function load(ResourceInterface $resources)
+    {
+        if (!$resources instanceof IteratorResourceInterface) {
+            $resources = array($resources);
+        }
+
+        $formulae = array();
+
+        foreach ($resources as $resource) {
+            $id = (string) $resource;
+            if (!$this->configCache->has($id) || ($this->debug && !$resource->isFresh($this->configCache->getTimestamp($id)))) {
+                $formulae += $this->loader->load($resource);
+                $this->configCache->set($id, $formulae);
+            } else {
+                $formulae += $this->configCache->get($id);
+            }
+        }
+
+        return $formulae;
+    }
+}