interface CommentStorageInterface

interface CommentStorageInterface extends ContentEntityStorageInterface {
    
    /**
     * Gets the maximum encoded thread value for the top level comments.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   A comment entity.
     *
     * @return string|null
     *   The maximum encoded thread value among the top level comments of the
     *   node $comment belongs to. NULL is returned when the commented entity has
     *   no comments.
     */
    public function getMaxThread(CommentInterface $comment);
    
    /**
     * Gets the maximum encoded thread value for the children of this comment.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   A comment entity.
     *
     * @return string|null
     *   The maximum encoded thread value among all replies of $comment. NULL is
     *   returned when the commented entity has no comments.
     */
    public function getMaxThreadPerThread(CommentInterface $comment);
    
    /**
     * Calculates the page number for the first new comment.
     *
     * @param int $total_comments
     *   The total number of comments that the entity has.
     * @param int $new_comments
     *   The number of new comments that the entity has.
     * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
     *   The entity to which the comments belong.
     * @param string $field_name
     *   The field name on the entity to which comments are attached.
     *
     * @return array|null
     *   The page number where first new comment appears. (First page returns 0.)
     */
    public function getNewCommentPageNumber($total_comments, $new_comments, FieldableEntityInterface $entity, $field_name);
    
    /**
     * Gets the display ordinal or page number for a comment.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   The comment to use as a reference point.
     * @param int $comment_mode
     *   The comment display mode: CommentManagerInterface::COMMENT_MODE_FLAT or
     *   CommentManagerInterface::COMMENT_MODE_THREADED.
     * @param int $divisor
     *   Defaults to 1, which returns the display ordinal for a comment. If the
     *   number of comments per page is provided, the returned value will be the
     *   page number. (The return value will be divided by $divisor.)
     *
     * @return int
     *   The display ordinal or page number for the comment. It is 0-based, so
     *   will represent the number of items before the given comment/page.
     */
    public function getDisplayOrdinal(CommentInterface $comment, $comment_mode, $divisor = 1);
    
    /**
     * Gets the comment ids of the passed comment entities' children.
     *
     * @param \Drupal\comment\CommentInterface[] $comments
     *   An array of comment entities keyed by their ids.
     *
     * @return array
     *   The entity ids of the passed comment entities' children as an array.
     */
    public function getChildCids(array $comments);
    
    /**
     * Retrieves comments for a thread, sorted in an order suitable for display.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity whose comment(s) needs rendering.
     * @param string $field_name
     *   The field_name whose comment(s) needs rendering.
     * @param int $mode
     *   The comment display mode: CommentManagerInterface::COMMENT_MODE_FLAT or
     *   CommentManagerInterface::COMMENT_MODE_THREADED.
     * @param int $comments_per_page
     *   (optional) The amount of comments to display per page.
     *   Defaults to 0, which means show all comments.
     * @param int $pager_id
     *   (optional) Pager id to use in case of multiple pagers on the one page.
     *   Defaults to 0; is only used when $comments_per_page is greater than zero.
     *
     * @return array
     *   Ordered array of comment objects, keyed by comment id.
     */
    public function loadThread(EntityInterface $entity, $field_name, $mode, $comments_per_page = 0, $pager_id = 0);
    
    /**
     * Returns the number of unapproved comments.
     *
     * @return int
     *   The number of unapproved comments.
     */
    public function getUnapprovedCount();

}