[Config] Introduction of an ConfigurationInterface

src/Symfony/Bundle/AsseticBundle/DependencyInjection/AsseticExtension.php

@@ -99,11 +99,9 @@ class AsseticExtension extends Extension
      */
     static protected function processConfigs(array $configs, $debug, array $bundles)
     {
-        $configuration = new Configuration();
-        $tree = $configuration->getConfigTree($debug, $bundles);
-
         $processor = new Processor();
-        return $processor->process($tree, $configs);
+        $configuration = new Configuration($debug, $bundles);
+        return $processor->processConfiguration($configuration, $configs);
     }
 
     /**

src/Symfony/Bundle/AsseticBundle/DependencyInjection/Configuration.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\AsseticBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * This class contains the configuration information for the bundle
@@ -22,24 +23,36 @@ use Symfony\Component\Config\Definition\Builder\TreeBuilder;
  * @author Christophe Coevoet <stof@notk.org>
  * @author Kris Wallsmith <kris@symfony.com>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
+    private $bundles;
+    private $debug;
+
     /**
-     * Generates the configuration tree.
+     * Constructor
      *
      * @param Boolean $debug    Wether to use the debug mode
      * @param array   $bundles  An array of bundle names
-     * 
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
      */
-    public function getConfigTree($debug, array $bundles)
+    public function __construct($debug, array $bundles)
     {
-        $tree = new TreeBuilder();
+        $this->debug = (Boolean) $debug;
+        $this->bundles = $bundles;
+    }
 
-        $tree->root('assetic')
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
+    {
+        $builder = new TreeBuilder();
+
+        $builder->root('assetic')
             ->children()
-                ->booleanNode('debug')->defaultValue($debug)->end()
-                ->booleanNode('use_controller')->defaultValue($debug)->end()
+                ->booleanNode('debug')->defaultValue($this->debug)->end()
+                ->booleanNode('use_controller')->defaultValue($this->debug)->end()
                 ->scalarNode('read_from')->defaultValue('%kernel.root_dir%/../web')->end()
                 ->scalarNode('write_to')->defaultValue('%assetic.read_from%')->end()
                 ->scalarNode('java')->defaultValue('/usr/bin/java')->end()
@@ -51,7 +64,7 @@ class Configuration
             ->fixXmlConfig('bundle')
             ->children()
                 ->arrayNode('bundles')
-                    ->defaultValue($bundles)
+                    ->defaultValue($this->bundles)
                     ->requiresAtLeastOneElement()
                     ->beforeNormalization()
                         ->ifTrue(function($v) { return !is_array($v); })
@@ -84,6 +97,6 @@ class Configuration
             ->end()
         ;
 
-        return $tree->buildTree();
+        return $builder;
     }
 }

src/Symfony/Bundle/DoctrineBundle/DependencyInjection/Configuration.php

@@ -13,6 +13,7 @@ namespace Symfony\Bundle\DoctrineBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * This class contains the configuration information for the bundle
@@ -22,28 +23,34 @@ use Symfony\Component\Config\Definition\Builder\TreeBuilder;
  *
  * @author Christophe Coevoet <stof@notk.org>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
-    private $kernelDebug;
+    private $debug;
 
     /**
-     * Generates the configuration tree.
+     * Constructor
      *
-     * @param Boolean $kernelDebug
-     *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @param Boolean $debug Wether to use the debug mode
      */
-    public function getConfigTree($kernelDebug)
+    public function  __construct($debug)
+    {
+        $this->debug = (Boolean) $debug;
+    }
+    
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
     {
-        $this->kernelDebug = (bool) $kernelDebug;
-
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('doctrine');
 
         $this->addDbalSection($rootNode);
         $this->addOrmSection($rootNode);
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 
     private function addDbalSection(ArrayNodeDefinition $node)
@@ -98,7 +105,7 @@ class Configuration
                     ->scalarNode('unix_socket')->end()
                     ->scalarNode('platform_service')->end()
                     ->scalarNode('charset')->end()
-                    ->booleanNode('logging')->defaultValue($this->kernelDebug)->end()
+                    ->booleanNode('logging')->defaultValue($this->debug)->end()
                 ->end()
                 ->fixXmlConfig('driver_class', 'driverClass')
                 ->children()

src/Symfony/Bundle/DoctrineBundle/DependencyInjection/DoctrineExtension.php

@@ -31,9 +31,9 @@ class DoctrineExtension extends AbstractDoctrineExtension
 {
     public function load(array $configs, ContainerBuilder $container)
     {
-        $configuration = new Configuration();
         $processor = new Processor();
-        $config = $processor->process($configuration->getConfigTree($container->getParameter('kernel.debug')), $configs);
+        $configuration = new Configuration($container->getParameter('kernel.debug'));
+        $config = $processor->processConfiguration($configuration, $configs);
 
         if (!empty($config['dbal'])) {
             $this->dbalLoad($config['dbal'], $container);

src/Symfony/Bundle/DoctrineMigrationsBundle/DependencyInjection/Configuration.php

@@ -3,20 +3,21 @@
 namespace Symfony\Bundle\DoctrineMigrationsBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * DoctrineMigrationsExtension configuration structure.
  *
  * @author Lukas Kahwe Smith <smith@pooteeweet.org>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
     /**
-     * Generates the configuration tree.
+     * Generates the configuration tree builder.
      *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
      */
-    public function getConfigTree()
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('doctrine_migrations', 'array');
@@ -30,6 +31,6 @@ class Configuration
             ->end()
         ;
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 }

src/Symfony/Bundle/DoctrineMigrationsBundle/DependencyInjection/DoctrineMigrationsExtension.php

@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\DoctrineMigrationsBundle\DependencyInjection;
 
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+use Symfony\Component\Config\Definition\Processor;
 
 /**
  * DoctrineMigrationsExtension.
@@ -33,7 +33,7 @@ class DoctrineMigrationsExtension extends Extension
         $processor = new Processor();
         $configuration = new Configuration();
 
-        $config = $processor->process($configuration->getConfigTree(), $configs);
+        $config = $processor->processConfiguration($configuration, $configs);
 
         foreach ($config as $key => $value) {
             $container->setParameter($this->getAlias().'.'.$key, $value);

src/Symfony/Bundle/DoctrineMongoDBBundle/DependencyInjection/Configuration.php

@@ -4,13 +4,14 @@ namespace Symfony\Bundle\DoctrineMongoDBBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * FrameworkExtension configuration structure.
  *
  * @author Ryan Weaver <ryan@thatsquality.com>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
     private $debug;
 
@@ -25,11 +26,11 @@ class Configuration
     }
 
     /**
-     * Generates the configuration tree.
+     * Generates the configuration tree builder.
      *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
      */
-    public function getConfigTree()
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('doctrine_mongo_db');
@@ -49,7 +50,7 @@ class Configuration
             ->end()
         ;
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 
     /**

src/Symfony/Bundle/DoctrineMongoDBBundle/DependencyInjection/DoctrineMongoDBExtension.php

@@ -17,8 +17,8 @@ use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\Config\FileLocator;
-use Symfony\Bundle\DoctrineAbstractBundle\DependencyInjection\AbstractDoctrineExtension;
 use Symfony\Component\Config\Definition\Processor;
+use Symfony\Bundle\DoctrineAbstractBundle\DependencyInjection\AbstractDoctrineExtension;
 
 /**
  * Doctrine MongoDB ODM extension.
@@ -40,7 +40,7 @@ class DoctrineMongoDBExtension extends AbstractDoctrineExtension
 
         $processor = new Processor();
         $configuration = new Configuration($container->getParameter('kernel.debug'));
-        $config = $processor->process($configuration->getConfigTree(), $configs);
+        $config = $processor->processConfiguration($configuration, $configs);
 
         // can't currently default this correctly in Configuration
         if (!isset($config['metadata_cache_driver'])) {

src/Symfony/Bundle/DoctrineMongoDBBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -14,7 +14,6 @@ namespace Symfony\Bundle\DoctrineMongoDBBundle\Tests\DependencyInjection;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Bundle\DoctrineMongoDBBundle\DependencyInjection\Configuration;
 use Symfony\Component\Yaml\Yaml;
-
 use Symfony\Component\Config\Definition\Processor;
 
 class ConfigurationTest extends \PHPUnit_Framework_TestCase
@@ -23,7 +22,7 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
     {
         $processor = new Processor();
         $configuration = new Configuration(false);
-        $options = $processor->process($configuration->getConfigTree(), array());
+        $options = $processor->processConfiguration($configuration, array());
 
         $defaults = array(
             'auto_generate_hydrator_classes'    => false,
@@ -56,7 +55,7 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
     {
         $processor = new Processor();
         $configuration = new Configuration(false);
-        $options = $processor->process($configuration->getConfigTree(), array($config));
+        $options = $processor->processConfiguration($configuration, array($config));
 
         $expected = array(
             'proxy_namespace'                   => 'Test_Proxies',
@@ -141,7 +140,7 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
     {
         $processor = new Processor();
         $configuration = new Configuration(false);
-        $options = $processor->process($configuration->getConfigTree(), $configs);
+        $options = $processor->processConfiguration($configuration, $configs);
 
         foreach ($correctValues as $key => $correctVal)
         {
@@ -230,7 +229,7 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
     {
         $processor = new Processor();
         $configuration = new Configuration(false);
-        $options = $processor->process($configuration->getConfigTree(), array($config));
+        $options = $processor->processConfiguration($configuration, array($config));
         $this->assertSame($normalized, $options[$targetKey]);
     }
 

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -4,29 +4,40 @@ namespace Symfony\Bundle\FrameworkBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * FrameworkExtension configuration structure.
  *
  * @author Jeremy Mikola <jmikola@gmail.com>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
+    private $debug;
+
     /**
-     * Generates the configuration tree.
+     * Constructor
      *
-     * @param boolean $kernelDebug The kernel.debug DIC parameter
-     *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @param Boolean $debug Wether to use the debug mode
      */
-    public function getConfigTree($kernelDebug)
+    public function  __construct($debug)
+    {
+        $this->debug = (Boolean) $debug;
+    }
+
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('framework');
 
         $rootNode
             ->children()
-                ->scalarNode('cache_warmer')->defaultValue(!$kernelDebug)->end()
+                ->scalarNode('cache_warmer')->defaultValue(!$this->debug)->end()
                 ->scalarNode('charset')->end()
                 ->scalarNode('document_root')->end()
                 ->scalarNode('error_handler')->end()
@@ -45,7 +56,7 @@ class Configuration
         $this->addTranslatorSection($rootNode);
         $this->addValidationSection($rootNode);
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 
     private function addCsrfProtectionSection(ArrayNodeDefinition $rootNode)

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -15,12 +15,12 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Definition\Processor;
 
 /**
  * FrameworkExtension.
@@ -56,9 +56,8 @@ class FrameworkExtension extends Extension
         }
 
         $processor = new Processor();
-        $configuration = new Configuration();
-
-        $config = $processor->process($configuration->getConfigTree($container->getParameter('kernel.debug')), $configs);
+        $configuration = new Configuration($container->getParameter('kernel.debug'));
+        $config = $processor->processConfiguration($configuration, $configs);
 
         $container->setParameter('kernel.cache_warmup', $config['cache_warmer']);
 

src/Symfony/Bundle/SecurityBundle/DependencyInjection/FactoryConfiguration.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Symfony\Bundle\SecurityBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+/**
+ * This class contains the configuration information for the following tags:
+ *
+ *   * security.config
+ *   * security.acl
+ *
+ * This information is solely responsible for how the different configuration
+ * sections are normalized, and merged.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class FactoryConfiguration implements ConfigurationInterface
+{
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
+    {
+        $tb = new TreeBuilder();
+
+        $tb
+            ->root('security')
+                ->ignoreExtraKeys()
+                ->fixXmlConfig('factory', 'factories')
+                ->children()
+                    ->arrayNode('factories')
+                        ->prototype('scalar')->end()
+                    ->end()
+                ->end()
+            ->end()
+        ;
+
+        return $tb;
+    }
+}

src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php

@@ -4,6 +4,7 @@ namespace Symfony\Bundle\SecurityBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * This class contains the configuration information for the following tags:
@@ -16,31 +17,26 @@ use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class Configuration
+class MainConfiguration implements ConfigurationInterface
 {
-    /**
-     * Generates the configuration tree.
-     *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
-     */
-    public function getFactoryConfigTree()
-    {
-        $tb = new TreeBuilder();
+    private $factories;
 
-        return $tb
-            ->root('security')
-                ->ignoreExtraKeys()
-                ->fixXmlConfig('factory', 'factories')
-                ->children()
-                    ->arrayNode('factories')
-                        ->prototype('scalar')->end()
-                    ->end()
-                ->end()
-            ->end()
-            ->buildTree();
+    /**
+     * Constructor.
+     *
+     * @param array $factories 
+     */
+    public function __construct(array $factories)
+    {
+        $this->factories = $factories;
     }
 
-    public function getMainConfigTree(array $factories)
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
     {
         $tb = new TreeBuilder();
         $rootNode = $tb->root('security');
@@ -69,11 +65,11 @@ class Configuration
         $this->addAclSection($rootNode);
         $this->addEncodersSection($rootNode);
         $this->addProvidersSection($rootNode);
-        $this->addFirewallsSection($rootNode, $factories);
+        $this->addFirewallsSection($rootNode, $this->factories);
         $this->addAccessControlSection($rootNode);
         $this->addRoleHierarchySection($rootNode);
 
-        return $tb->buildTree();
+        return $tb;
     }
 
     private function addAclSection(ArrayNodeDefinition $rootNode)

src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Bundle\SecurityBundle\DependencyInjection;
 
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\DependencyInjection\DefinitionDecorator;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
@@ -20,6 +19,7 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Definition\Processor;
 
 /**
  * SecurityExtension.
@@ -32,14 +32,8 @@ class SecurityExtension extends Extension
     private $requestMatchers = array();
     private $contextListeners = array();
     private $listenerPositions = array('pre_auth', 'form', 'http', 'remember_me');
-    private $configuration;
     private $factories;
 
-    public function __construct()
-    {
-        $this->configuration = new Configuration();
-    }
-
     public function load(array $configs, ContainerBuilder $container)
     {
         if (!array_filter($configs)) {
@@ -49,11 +43,13 @@ class SecurityExtension extends Extension
         $processor = new Processor();
 
         // first assemble the factories
-        $factories = $this->createListenerFactories($container, $processor->process($this->configuration->getFactoryConfigTree(), $configs));
+        $factoriesConfig = new FactoryConfiguration();
+        $config = $processor->processConfiguration($factoriesConfig, $configs);
+        $factories = $this->createListenerFactories($container, $config);
 
         // normalize and merge the actual configuration
-        $tree = $this->configuration->getMainConfigTree($factories);
-        $config = $processor->process($tree, $configs);
+        $mainConfig = new MainConfiguration($factories);
+        $config = $processor->processConfiguration($mainConfig, $configs);
 
         // load services
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));

src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Configuration;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\MainConfiguration;
 use Symfony\Component\Config\Definition\Processor;
 
 class ConfigurationTest extends \PHPUnit_Framework_TestCase
@@ -41,11 +41,10 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
             'factory'   => array('foo' => 'bar'),
             'factories' => array('lorem' => 'ipsum'),
         ));
-        
-        $configuration = new Configuration();
+
         $processor = new Processor();
-        $tree = $configuration->getMainConfigTree(array());
-        $config = $processor->process($tree, array($config));
+        $configuration = new MainConfiguration(array());
+        $config = $processor->processConfiguration($configuration, array($config));
 
         $this->assertFalse(array_key_exists('factory', $config), 'The factory key is silently removed without an exception');
         $this->assertEquals(array(), $config['factories'], 'The factories key is just an empty array');

src/Symfony/Bundle/SwiftmailerBundle/DependencyInjection/Configuration.php

@@ -13,6 +13,7 @@ namespace Symfony\Bundle\SwiftmailerBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * This class contains the configuration information for the bundle
@@ -22,16 +23,26 @@ use Symfony\Component\Config\Definition\Builder\TreeBuilder;
  *
  * @author Christophe Coevoet <stof@notk.org>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
+    private $debug;
+
     /**
-     * Generates the configuration tree.
+     * Constructor.
      *
-     * @param Boolean $kernelDebug
-     * 
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @param Boolean $debug The kernel.debug value
      */
-    public function getConfigTree($kernelDebug)
+    public function __construct($debug)
+    {
+        $this->debug = (Boolean) $debug;
+    }
+    
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('swiftmailer');
@@ -71,10 +82,10 @@ class Configuration
                 ->end()
                 ->scalarNode('delivery_address')->end()
                 ->booleanNode('disable_delivery')->end()
-                ->booleanNode('logging')->defaultValue($kernelDebug)->end()
+                ->booleanNode('logging')->defaultValue($this->debug)->end()
             ->end()
         ;
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 }

src/Symfony/Bundle/SwiftmailerBundle/DependencyInjection/SwiftmailerExtension.php

@@ -48,9 +48,9 @@ class SwiftmailerExtension extends Extension
         $r = new \ReflectionClass('Swift_Message');
         $container->getDefinition('swiftmailer.mailer')->setFile(dirname(dirname(dirname($r->getFilename()))).'/swift_init.php');
 
-        $configuration = new Configuration();
         $processor = new Processor();
-        $config = $processor->process($configuration->getConfigTree($container->getParameter('kernel.debug')), $configs);
+        $configuration = new Configuration($container->getParameter('kernel.debug'));
+        $config = $processor->processConfiguration($configuration, $configs);
 
         if (null === $config['transport']) {
             $transport = 'null';

src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php

@@ -4,20 +4,21 @@ namespace Symfony\Bundle\TwigBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * TwigExtension configuration structure.
  *
  * @author Jeremy Mikola <jmikola@gmail.com>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
     /**
-     * Generates the configuration tree.
+     * Generates the configuration tree builder.
      *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
      */
-    public function getConfigTree()
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('twig');
@@ -33,7 +34,7 @@ class Configuration
         $this->addGlobalsSection($rootNode);
         $this->addTwigOptions($rootNode);
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 
     private function addExtensionsSection(ArrayNodeDefinition $rootNode)

src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php

@@ -39,8 +39,7 @@ class TwigExtension extends Extension
 
         $processor = new Processor();
         $configuration = new Configuration();
-
-        $config = $processor->process($configuration->getConfigTree(), $configs);
+        $config = $processor->processConfiguration($configuration, $configs);
 
         $container->setParameter('twig.form.resources', $config['form']['resources']);
 

src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/Configuration.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\WebProfilerBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * This class contains the configuration information for the bundle
@@ -21,14 +22,14 @@ use Symfony\Component\Config\Definition\Builder\TreeBuilder;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class Configuration
+class Configuration implements ConfigurationInterface
 {
     /**
-     * Generates the configuration tree.
+     * Generates the configuration tree builder.
      *
-     * @return \Symfony\Component\Config\Definition\ArrayNode The config tree
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
      */
-    public function getConfigTree()
+    public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('web_profiler');
@@ -41,6 +42,6 @@ class Configuration
             ->end()
         ;
 
-        return $treeBuilder->buildTree();
+        return $treeBuilder;
     }
 }

src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/WebProfilerExtension.php

@@ -39,9 +39,9 @@ class WebProfilerExtension extends Extension
      */
     public function load(array $configs, ContainerBuilder $container)
     {
-        $configuration = new Configuration();
         $processor = new Processor();
-        $config = $processor->process($configuration->getConfigTree(), $configs);
+        $configuration = new Configuration();
+        $config = $processor->processConfiguration($configuration, $configs);
 
         if ($config['toolbar']) {
             $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));

src/Symfony/Component/Config/Definition/ConfigurationInterface.php

@@ -0,0 +1,27 @@
+<?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\Config\Definition;
+
+/**
+ * Configuration interface
+ *
+ * @author Victor Berchet <victor@suumit.com>
+ */
+interface ConfigurationInterface
+{
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    function getConfigTreeBuilder();
+}

src/Symfony/Component/Config/Definition/Processor.php

@@ -19,11 +19,12 @@ namespace Symfony\Component\Config\Definition;
 class Processor
 {
     /**
-     * Processes a node tree.
+     * Processes an array of configurations.
      *
-     * @param NodeInterface $configTree The node tree to process
-     * @param array $configs An array of configuration items
-     * @return Boolean
+     * @param NodeInterface $configTree The node tree describing the configuration
+     * @param array         $configs    An array of configuration items to process
+     * 
+     * @return array The processed configuration
      */
     public function process(NodeInterface $configTree, array $configs)
     {
@@ -38,6 +39,19 @@ class Processor
         return $configTree->finalize($currentConfig);
     }
 
+    /**
+     * Processes an array of configurations.
+     *
+     * @param ConfigurationInterface $configuration  The configuration class
+     * @param array                  $configs        An array of configuration items to process
+     *
+     * @return array The processed configuration
+     */
+    public function processConfiguration(ConfigurationInterface $configuration, array $configs)
+    {
+        return $this->process($configuration->getConfigTreeBuilder()->buildTree(), $configs);
+    }
+
     /**
      * This method normalizes keys between the different configuration formats
      *