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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 scalar value in the config tree.
  18   *
  19   * The following values are considered scalars:
  20   *   * booleans
  21   *   * strings
  22   *   * null
  23   *   * integers
  24   *   * floats
  25   *
  26   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  27   */
  28  class ScalarNode extends VariableNode
  29  {
  30      /**
  31       * {@inheritdoc}
  32       */
  33      protected function validateType($value)
  34      {
  35          if (!is_scalar($value) && null !== $value) {
  36              $ex = new InvalidTypeException(sprintf(
  37                  'Invalid type for path "%s". Expected scalar, but got %s.',
  38                  $this->getPath(),
  39                  gettype($value)
  40              ));
  41              $ex->setPath($this->getPath());
  42  
  43              throw $ex;
  44          }
  45      }
  46  
  47      /**
  48       * {@inheritdoc}
  49       */
  50      protected function isValueEmpty($value)
  51      {
  52          return null === $value || '' === $value;
  53      }
  54  }