diff --git a/src/BeSimple/SoapServer/Classmap.php b/src/BeSimple/SoapServer/Classmap.php
new file mode 100644
index 0000000..aa1e3e9
--- /dev/null
+++ b/src/BeSimple/SoapServer/Classmap.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the BeSimpleSoapBundle.
+ *
+ * (c) Christian Kerl <christian-kerl@web.de>
+ * (c) Francis Besset <francis.besset@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace BeSimple\SoapServer;
+
+use BeSimple\SoapCommon\Classmap as BaseClassmap;
+
+/**
+ * @author Francis Besset <francis.besset@gmail.com>
+ */
+class Classmap extends BaseClassmap
+{
+    protected $classmapInversed = array();
+
+    /**
+     * {@inheritdoc}
+     */
+    public function add($type, $classname)
+    {
+        parent::add($type, $classname);
+
+        $this->classmapInversed[$classname] = $type;
+    }
+
+    public function getByClassname($classname)
+    {
+        if (!$this->hasByClassname($classname)) {
+            throw new \InvalidArgumentException(sprintf('The classname "%s" was not found in %s', $classname, __CLASS__));
+        }
+
+        return $this->classmapInversed[$classname];
+    }
+
+    public function hasByClassname($classname)
+    {
+        return isset($this->classmapInversed[$classname]);
+    }
+}