text: <?php
  
  /*
   * This file is part of the Symfony package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Symfony\Component\Config\Definition;
  
  use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
  
  /**
   * Node which only allows a finite set of values.
   *
   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
   */
  class EnumNode extends ScalarNode
  {
      private $values;
  
      public function __construct($name, NodeInterface $parent = null, array $values = array())
      {
          $values = array_unique($values);
          if (empty($values)) {
              throw new \InvalidArgumentException('$values must contain at least one element.');
          }
  
          parent::__construct($name, $parent);
          $this->values = $values;
      }
  
      public function getValues()
      {
          return $this->values;
      }
  
      protected function finalizeValue($value)
      {
          $value = parent::finalizeValue($value);
  
          if (!\in_array($value, $this->values, true)) {
              $ex = new InvalidConfigurationException(sprintf('The value %s is not allowed for path "%s". Permissible values: %s', json_encode($value), $this->getPath(), implode(', ', array_map('json_encode', $this->values))));
              $ex->setPath($this->getPath());
  
              throw $ex;
          }
  
          return $value;
      }
  }
  