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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  use Symfony\Component\Config\Definition\Exception\InvalidDefinitionException;
  16  
  17  /**
  18   * This class provides a fluent interface for defining a node.
  19   *
  20   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  21   */
  22  class BooleanNodeDefinition extends ScalarNodeDefinition
  23  {
  24      /**
  25       * {@inheritdoc}
  26       */
  27      public function __construct($name, NodeParentInterface $parent = null)
  28      {
  29          parent::__construct($name, $parent);
  30  
  31          $this->nullEquivalent = true;
  32      }
  33  
  34      /**
  35       * Instantiate a Node.
  36       *
  37       * @return BooleanNode The node
  38       */
  39      protected function instantiateNode()
  40      {
  41          return new BooleanNode($this->name, $this->parent);
  42      }
  43  
  44      /**
  45       * {@inheritdoc}
  46       *
  47       * @throws InvalidDefinitionException
  48       */
  49      public function cannotBeEmpty()
  50      {
  51          throw new InvalidDefinitionException('->cannotBeEmpty() is not applicable to BooleanNodeDefinition.');
  52      }
  53  }