Allow Kernel::$name to be overridden by subclasses

Because the name of the kernel is calculated in the constructor,
any child class that had overriden the kernel name, will be
ignored.

By setting the kernel name in the child class, we can avoid having
to execute the regex to calculate the name upon every construction
of a Kernel.

A test (and a kernel fixture) is added to prove that the override
works correctly.

Note: the Kernel API has not been touched, so there should be no
issues with BC.

src/Symfony/Component/HttpKernel/Kernel.php

@@ -79,7 +79,7 @@ public function __construct($environment, $debug)
         $this->debug = (Boolean) $debug;
         $this->booted = false;
         $this->rootDir = $this->getRootDir();
-        $this->name = preg_replace('/[^a-zA-Z0-9_]+/', '', basename($this->rootDir));
+        $this->name = $this->getName();
         $this->classes = array();
 
         if ($this->debug) {
@@ -354,6 +354,10 @@ public function locateResource($name, $dir = null, $first = true)
      */
     public function getName()
     {
+        if (null === $this->name) {
+            $this->name = preg_replace('/[^a-zA-Z0-9_]+/', '', basename($this->rootDir));
+        }
+
         return $this->name;
     }
 

src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForOverrideName.php

@@ -0,0 +1,30 @@
+<?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\HttpKernel\Tests\Fixtures;
+
+use Symfony\Component\HttpKernel\Kernel;
+use Symfony\Component\Config\Loader\LoaderInterface;
+
+class KernelForOverrideName extends Kernel
+{
+    protected $name = 'overridden';
+
+    public function registerBundles()
+    {
+
+    }
+
+    public function registerContainerConfiguration(LoaderInterface $loader)
+    {
+
+    }
+}

src/Symfony/Component/HttpKernel/Tests/KernelTest.php

@@ -17,6 +17,7 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Tests\Fixtures\KernelForTest;
+use Symfony\Component\HttpKernel\Tests\Fixtures\KernelForOverrideName;
 use Symfony\Component\HttpKernel\Tests\Fixtures\FooBarBundle;
 
 class KernelTest extends \PHPUnit_Framework_TestCase
@@ -310,6 +311,13 @@ public function testGetName()
         $this->assertEquals('Fixtures', $kernel->getName());
     }
 
+    public function testOverrideGetName()
+    {
+        $kernel = new KernelForOverrideName('test', true);
+
+        $this->assertEquals('overridden', $kernel->getName());
+    }
+
     public function testSerialize()
     {
         $env = 'test_env';