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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;
  13  
  14  use Symfony\Component\Config\Definition\Exception\InvalidTypeException;
  15  
  16  /**
  17   * This node represents a Boolean value in the config tree.
  18   *
  19   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  20   */
  21  class BooleanNode extends ScalarNode
  22  {
  23      /**
  24       * {@inheritdoc}
  25       */
  26      protected function validateType($value)
  27      {
  28          if (!is_bool($value)) {
  29              $ex = new InvalidTypeException(sprintf(
  30                  'Invalid type for path "%s". Expected boolean, but got %s.',
  31                  $this->getPath(),
  32                  gettype($value)
  33              ));
  34              $ex->setPath($this->getPath());
  35  
  36              throw $ex;
  37          }
  38      }
  39  
  40      /**
  41       * {@inheritdoc}
  42       */
  43      protected function isValueEmpty($value)
  44      {
  45          // a boolean value cannot be empty
  46          return false;
  47      }
  48  }