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diff --git a/vendor/symfony/validator/Mapping/Loader/AbstractLoader.php b/vendor/symfony/validator/Mapping/Loader/AbstractLoader.php
new file mode 100644
index 000000000..2ae89886c
--- /dev/null
+++ b/vendor/symfony/validator/Mapping/Loader/AbstractLoader.php
@@ -0,0 +1,91 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Mapping\Loader;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\MappingException;
+
+/**
+ * Base loader for validation metadata.
+ *
+ * This loader supports the loading of constraints from Symfony's default
+ * namespace (see {@link DEFAULT_NAMESPACE}) using the short class names of
+ * those constraints. Constraints can also be loaded using their fully
+ * qualified class names. At last, namespace aliases can be defined to load
+ * constraints with the syntax "alias:ShortName".
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+abstract class AbstractLoader implements LoaderInterface
+{
+    /**
+     * The namespace to load constraints from by default.
+     */
+    const DEFAULT_NAMESPACE = '\\Symfony\\Component\\Validator\\Constraints\\';
+
+    /**
+     * @var array
+     */
+    protected $namespaces = array();
+
+    /**
+     * Adds a namespace alias.
+     *
+     * The namespace alias can be used to reference constraints from specific
+     * namespaces in {@link newConstraint()}:
+     *
+     *     $this->addNamespaceAlias('mynamespace', '\\Acme\\Package\\Constraints\\');
+     *
+     *     $constraint = $this->newConstraint('mynamespace:NotNull');
+     *
+     * @param string $alias     The alias
+     * @param string $namespace The PHP namespace
+     */
+    protected function addNamespaceAlias($alias, $namespace)
+    {
+        $this->namespaces[$alias] = $namespace;
+    }
+
+    /**
+     * Creates a new constraint instance for the given constraint name.
+     *
+     * @param string $name    The constraint name. Either a constraint relative
+     *                        to the default constraint namespace, or a fully
+     *                        qualified class name. Alternatively, the constraint
+     *                        may be preceded by a namespace alias and a colon.
+     *                        The namespace alias must have been defined using
+     *                        {@link addNamespaceAlias()}.
+     * @param mixed  $options The constraint options
+     *
+     * @return Constraint
+     *
+     * @throws MappingException If the namespace prefix is undefined
+     */
+    protected function newConstraint($name, $options = null)
+    {
+        if (strpos($name, '\\') !== false && class_exists($name)) {
+            $className = (string) $name;
+        } elseif (strpos($name, ':') !== false) {
+            list($prefix, $className) = explode(':', $name, 2);
+
+            if (!isset($this->namespaces[$prefix])) {
+                throw new MappingException(sprintf('Undefined namespace prefix "%s"', $prefix));
+            }
+
+            $className = $this->namespaces[$prefix].$className;
+        } else {
+            $className = self::DEFAULT_NAMESPACE.$name;
+        }
+
+        return new $className($options);
+    }
+}