[HttpKernel] Add entry point to more easily create/configure the DI extension

GeLoLabs · GeLoLabs · commit 697ac87fa2d7 · 2015-02-06T23:59:46.000+01:00
diff --git a/src/Symfony/Component/HttpKernel/Bundle/Bundle.php b/src/Symfony/Component/HttpKernel/Bundle/Bundle.php
@@ -72,13 +72,13 @@ public function build(ContainerBuilder $container)
     public function getContainerExtension()
     {
         if (null === $this->extension) {
-            $class = $this->getContainerExtensionClass();
-            if (class_exists($class)) {
-                $extension = new $class();
+            $extension = $this->createContainerExtension();
 
+            if (null !== $extension) {
                 // check naming convention
                 $basename = preg_replace('/Bundle$/', '', $this->getName());
                 $expectedAlias = Container::underscore($basename);
+
                 if ($expectedAlias != $extension->getAlias()) {
                     throw new \LogicException(sprintf(
                         'Users will expect the alias of the default extension of a bundle to be the underscored version of the bundle name ("%s"). You can override "Bundle::getContainerExtension()" if you want to use "%s" or another alias.',
@@ -208,4 +208,16 @@ protected function getContainerExtensionClass()
 
         return $this->getNamespace().'\\DependencyInjection\\'.$basename.'Extension';
     }
+
+    /**
+     * Creates the bundle's container extension.
+     *
+     * @return ExtensionInterface|null
+     */
+    protected function createContainerExtension()
+    {
+        if (class_exists($class = $this->getContainerExtension())) {
+            return new $class();
+        }
+    }
 }
