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',
        ];
    }

}