class DateFormat

class DateFormat extends ConfigEntityBase implements DateFormatInterface {

  /**
   * The date format machine name.
   *
   * @var string
   */
  protected $id;

  /**
   * The human-readable name of the date format entity.
   *
   * @var string
   */
  protected $label;

  /**
   * The date format pattern.
   *
   * @var string
   */
  protected $pattern;

  /**
   * The locked status of this date format.
   *
   * @var bool
   */
  protected $locked = FALSE;

  /**
   * {@inheritdoc}
   */
  public function getPattern() {
    return $this->pattern;
  }

  /**
   * {@inheritdoc}
   */
  public function setPattern($pattern) {
    $this->pattern = $pattern;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function isLocked() {
    return (bool) $this->locked;
  }

  /**
   * {@inheritdoc}
   */
  public static function sort(ConfigEntityInterface $a, ConfigEntityInterface $b) {
    if ($a
      ->isLocked() == $b
      ->isLocked()) {
      $a_label = $a
        ->label();
      $b_label = $b
        ->label();
      return strnatcasecmp($a_label, $b_label);
    }
    return $a
      ->isLocked() ? 1 : -1;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheTagsToInvalidate() {
    return [
      'rendered',
    ];
  }

}