vendor/doctrine/doctrine-bundle/DependencyInjection/Configuration.php

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<?php

/*
 * This file is part of the Doctrine Bundle
 *
 * The code was originally distributed inside the Symfony framework.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 * (c) Doctrine Project, Benjamin Eberlei <kontakt@beberlei.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Doctrine\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
 *
 * This information is solely responsible for how the different configuration
 * sections are normalized, and merged.
 *
 * @author Christophe Coevoet <stof@notk.org>
 */
class Configuration implements ConfigurationInterface
{
    private $debug;

    /**
     * Constructor
     *
     * @param Boolean $debug Whether to use the debug mode
     */
    public function __construct($debug)
    {
        $this->debug = (Boolean) $debug;
    }

    /**
     * {@inheritDoc}
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('doctrine');

        $this->addDbalSection($rootNode);
        $this->addOrmSection($rootNode);

        return $treeBuilder;
    }

    /**
     * Add DBAL section to configuration tree
     *
     * @param ArrayNodeDefinition $node