interface TermStorageInterface

interface TermStorageInterface extends ContentEntityStorageInterface {
    
    /**
     * Removed reference to terms from term_hierarchy.
     *
     * @param array $tids
     *   Array of terms that need to be removed from hierarchy.
     *
     * @todo Remove this method in Drupal 9.0.x. Now the parent references are
     *   automatically cleared when deleting a taxonomy term.
     *   https://www.drupal.org/node/2785693
     */
    public function deleteTermHierarchy($tids);
    
    /**
     * Updates terms hierarchy information with the hierarchy trail of it.
     *
     * @param \Drupal\Core\Entity\EntityInterface $term
     *   Term entity that needs to be added to term hierarchy information.
     *
     * @todo remove this method Drupal 9.0.x. Now the parent references are
     *   automatically updates when a taxonomy term is added/updated.
     *   https://www.drupal.org/node/2785693
     */
    public function updateTermHierarchy(EntityInterface $term);
    
    /**
     * Finds all parents of a given term ID.
     *
     * @param int $tid
     *   Term ID to retrieve parents for.
     *
     * @return \Drupal\taxonomy\TermInterface[]
     *   An array of term objects which are the parents of the term $tid.
     */
    public function loadParents($tid);
    
    /**
     * Finds all ancestors of a given term ID.
     *
     * @param int $tid
     *   Term ID to retrieve ancestors for.
     *
     * @return \Drupal\taxonomy\TermInterface[]
     *   An array of term objects which are the ancestors of the term $tid.
     */
    public function loadAllParents($tid);
    
    /**
     * Finds all children of a term ID.
     *
     * @param int $tid
     *   Term ID to retrieve children for.
     * @param string $vid
     *   An optional vocabulary ID to restrict the child search.
     *
     * @return \Drupal\taxonomy\TermInterface[]
     *   An array of term objects that are the children of the term $tid.
     */
    public function loadChildren($tid, $vid = NULL);
    
    /**
     * Finds all terms in a given vocabulary ID.
     *
     * @param string $vid
     *   Vocabulary ID to retrieve terms for.
     * @param int $parent
     *   The term ID under which to generate the tree. If 0, generate the tree
     *   for the entire vocabulary.
     * @param int $max_depth
     *   The number of levels of the tree to return. Leave NULL to return all
     *   levels.
     * @param bool $load_entities
     *   If TRUE, a full entity load will occur on the term objects. Otherwise
     *   they are partial objects queried directly from the {taxonomy_term_data}
     *   table to save execution time and memory consumption when listing large
     *   numbers of terms. Defaults to FALSE.
     *
     * @return object[]|\Drupal\taxonomy\TermInterface[]
     *   A numerically indexed array of term objects that are the children of the
     *   vocabulary $vid.
     */
    public function loadTree($vid, $parent = 0, $max_depth = NULL, $load_entities = FALSE);
    
    /**
     * Count the number of nodes in a given vocabulary ID.
     *
     * @param string $vid
     *   Vocabulary ID to retrieve terms for.
     *
     * @return int
     *   A count of the nodes in a given vocabulary ID.
     */
    public function nodeCount($vid);
    
    /**
     * Reset the weights for a given vocabulary ID.
     *
     * @param string $vid
     *   Vocabulary ID to retrieve terms for.
     */
    public function resetWeights($vid);
    
    /**
     * Returns all terms used to tag some given nodes.
     *
     * @param array $nids
     *   Node IDs to retrieve terms for.
     * @param array $vids
     *   (optional) an array of vocabulary IDs to restrict the term search.
     *   Defaults to empty array.
     * @param string $langcode
     *   (optional) A language code to restrict the term search. Defaults to NULL.
     *
     * @return array
     *   An array of nids and the term entities they were tagged with.
     */
    public function getNodeTerms(array $nids, array $vids = [], $langcode = NULL);
    
    /**
     * Returns the hierarchy type for a specific vocabulary ID.
     *
     * @param string $vid
     *   Vocabulary ID to retrieve the hierarchy type for.
     *
     * @return int
     *   The vocabulary hierarchy.
     *   Possible values:
     *    - VocabularyInterface::HIERARCHY_DISABLED: No parents.
     *    - VocabularyInterface::HIERARCHY_SINGLE: Single parent.
     *    - VocabularyInterface::HIERARCHY_MULTIPLE: Multiple parents.
     */
    public function getVocabularyHierarchyType($vid);
    
    /**
     * Gets a list of term IDs with pending revisions.
     *
     * @return int[]
     *   An array of term IDs which have pending revisions, keyed by their
     *   revision IDs.
     *
     * @internal
     */
    public function getTermIdsWithPendingRevisions();

}