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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Config\Definition\Builder;
  13  
  14  use Symfony\Component\Config\Definition\BooleanNode;
  15  
  16  /**
  17   * This class provides a fluent interface for defining a node.
  18   *
  19   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  20   */
  21  class BooleanNodeDefinition extends ScalarNodeDefinition
  22  {
  23      /**
  24       * {@inheritdoc}
  25       */
  26      public function __construct($name, NodeParentInterface $parent = null)
  27      {
  28          parent::__construct($name, $parent);
  29  
  30          $this->nullEquivalent = true;
  31      }
  32  
  33      /**
  34       * Instantiate a Node.
  35       *
  36       * @return BooleanNode The node
  37       */
  38      protected function instantiateNode()
  39      {
  40          return new BooleanNode($this->name, $this->parent);
  41      }
  42  }