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diff --git a/vendor/symfony-cmf/routing/Enhancer/FieldPresenceEnhancer.php b/vendor/symfony-cmf/routing/Enhancer/FieldPresenceEnhancer.php
new file mode 100644
index 000000000..c281792fd
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+++ b/vendor/symfony-cmf/routing/Enhancer/FieldPresenceEnhancer.php
@@ -0,0 +1,76 @@
+<?php
+
+/*
+ * This file is part of the Symfony CMF package.
+ *
+ * (c) 2011-2015 Symfony CMF
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Cmf\Component\Routing\Enhancer;
+
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * This enhancer sets a field to a fixed value. You can specify a source field
+ * name to only set the target field if the source is present.
+ *
+ * @author David Buchmann
+ */
+class FieldPresenceEnhancer implements RouteEnhancerInterface
+{
+    /**
+     * Field name for the source field that must exist. If null, the target
+     * field is always set if not already present.
+     *
+     * @var string|null
+     */
+    protected $source;
+
+    /**
+     * Field name to write the value into.
+     *
+     * @var string
+     */
+    protected $target;
+
+    /**
+     * Value to set the target field to.
+     *
+     * @var string
+     */
+    private $value;
+
+    /**
+     * @param null|string $source the field name of the class, null to disable the check
+     * @param string      $target the field name to set from the map
+     * @param string      $value  value to set target field to if source field exists
+     */
+    public function __construct($source, $target, $value)
+    {
+        $this->source = $source;
+        $this->target = $target;
+        $this->value = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function enhance(array $defaults, Request $request)
+    {
+        if (isset($defaults[$this->target])) {
+            // no need to do anything
+            return $defaults;
+        }
+
+        if (null !== $this->source && !isset($defaults[$this->source])) {
+            return $defaults;
+        }
+
+        $defaults[$this->target] = $this->value;
+
+        return $defaults;
+    }
+}