diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/Extension.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/Extension.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,104 @@
+<?php
+
+namespace Symfony\Component\HttpKernel\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Processor;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Container;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * Provides useful features shared by many extensions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Extension implements ExtensionInterface
+{
+    private $classes = array();
+
+    /**
+     * Gets the classes to cache.
+     *
+     * @return array An array of classes
+     */
+    public function getClassesToCompile()
+    {
+        return $this->classes;
+    }
+
+    /**
+     * Adds classes to the class cache.
+     *
+     * @param array $classes An array of classes
+     */
+    public function addClassesToCompile(array $classes)
+    {
+        $this->classes = array_merge($this->classes, $classes);
+    }
+
+    /**
+     * Returns the base path for the XSD files.
+     *
+     * @return string The XSD base path
+     */
+    public function getXsdValidationBasePath()
+    {
+        return false;
+    }
+
+    /**
+     * Returns the namespace to be used for this extension (XML namespace).
+     *
+     * @return string The XML namespace
+     */
+    public function getNamespace()
+    {
+        return 'http://example.org/schema/dic/'.$this->getAlias();
+    }
+
+    /**
+     * Returns the recommended alias to use in XML.
+     *
+     * This alias is also the mandatory prefix to use when using YAML.
+     *
+     * This convention is to remove the "Extension" postfix from the class
+     * name and then lowercase and underscore the result. So:
+     *
+     *     AcmeHelloExtension
+     *
+     * becomes
+     *
+     *     acme_hello
+     *
+     * This can be overridden in a sub-class to specify the alias manually.
+     *
+     * @return string The alias
+     */
+    public function getAlias()
+    {
+        $className = get_class($this);
+        if (substr($className, -9) != 'Extension') {
+            throw new \BadMethodCallException('This extension does not follow the naming convention; you must overwrite the getAlias() method.');
+        }
+        $classBaseName = substr(strrchr($className, '\\'), 1, -9);
+
+        return Container::underscore($classBaseName);
+    }
+
+    protected final function processConfiguration(ConfigurationInterface $configuration, array $configs)
+    {
+        $processor = new Processor();
+
+        return $processor->processConfiguration($configuration, $configs);
+    }
+}