class DataConvert

class DataConvert extends RulesActionBase {
  
  /**
   * {@inheritdoc}
   */
  public function refineContextDefinitions(array $selected_data) {
    if ($type = $this->getContextValue('target_type')) {
      $this->pluginDefinition['provides']['conversion_result']
        ->setDataType($type);
    }
  }
  
  /**
   * Executes the plugin.
   *
   * @param mixed $value
   *   The input value.
   * @param string $target_type
   *   The target type the value should be converted into.
   * @param string $rounding_behavior
   *   The behavior for rounding.
   */
  protected function doExecute($value, $target_type, $rounding_behavior = NULL) {
    // @todo Add support for objects implementing __toString().
    if (!is_scalar($value)) {
      throw new InvalidArgumentException('Only scalar values are supported.');
    }
    // Ensure valid contexts have been provided.
    // @todo check how this works. May need to use !empty to allow the selection
    // list to be used and give an empty value?
    if (isset($rounding_behavior) && $target_type != 'integer') {
      throw new InvalidArgumentException('A rounding behavior only makes sense with an integer target type.');
    }
    // First apply the rounding behavior if given.
    if (!empty($rounding_behavior)) {
      switch ($rounding_behavior) {
        case 'up':
          $value = ceil($value);
          break;

        case 'down':
          $value = floor($value);
          break;

        case 'round':
          $value = round($value);
          break;

        default:
          throw new InvalidArgumentException("Unknown rounding behavior: {$rounding_behavior}");
      }
    }
    switch ($target_type) {
      case 'float':
        $result = floatval($value);
        break;

      case 'integer':
        $result = intval($value);
        break;

      case 'string':
        $result = strval($value);
        break;

      default:
        throw new InvalidArgumentException("Unknown target type: {$target_type}");
    }
    $this->setProvidedValue('conversion_result', $result);
  }

}