sf4 depreciation: repairing crud custom routes loader

CRUD/Routing/CRUDRoutesLoader.php

@@ -20,25 +20,58 @@
 
 namespace Chill\MainBundle\CRUD\Routing;
 
+use Symfony\Component\Config\Loader\Loader;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
-
 /**
+ * Class CRUDRoutesLoader
  * Load the route for CRUD
  *
+ * @package Chill\MainBundle\CRUD\Routing
  */
-class CRUDRoutesLoader
+class CRUDRoutesLoader extends Loader
 {
+    /**
+     * @var array
+     */
     protected $config = [];
     
+    /**
+     * @var bool
+     */
+    private $isLoaded = false;
+    
+    /**
+     * CRUDRoutesLoader constructor.
+     *
+     * @param $config
+     */
     public function __construct($config)
     {
         $this->config = $config;
     }
     
-    public function load()
+    /**
+     * @param mixed $resource
+     * @param null $type
+     * @return bool
+     */
+    public function supports($resource, $type = null)
     {
+        return 'CRUD' === $type;
+    }
+    
+    /**
+     * @return RouteCollection
+     */
+    public function load($resource, $type = null)
+    {
+    
+        if (true === $this->isLoaded) {
+            throw new \RuntimeException('Do not add the "CRUD" loader twice');
+        }
+        
         $collection = new RouteCollection();
         
         foreach ($this->config as $config) {
@@ -48,6 +81,10 @@ class CRUDRoutesLoader
         return $collection;
     }
     
+    /**
+     * @param $config
+     * @return RouteCollection
+     */
     protected function loadConfig($config): RouteCollection
     {
         $collection = new RouteCollection();