Add a filesystem map service

FilesystemMap.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Knplabs\Bundle\GaufretteBundle;
+
+/**
+ * Holds references to all declared filesystems
+ * and allows to access them through their name
+ */
+class FilesystemMap
+{
+    /**
+     * Map of filesystems indexed by their name
+     *
+     * @var array
+     */
+    private $map;
+
+    /**
+     * Instanciates a new filesystem map
+     *
+     * @param array $map
+     */
+    public function __construct(array $map)
+    {
+        $this->map = $map;
+    }
+
+    /**
+     * @param string $name name of a filesystem
+     * @throw \InvalidArgumentException if the filesystem does not exist
+     * @return Filesystem
+     */
+    public function get($name)
+    {
+        if (!isset($this->map[$name])) {
+            throw new \InvalidArgumentException(sprintf('No filesystem register for name "%s"', $name));
+        }
+
+        return $this->map[$name];
+    }
+}