interface QueryFactoryInterface

interface QueryFactoryInterface {
    
    /**
     * Instantiates an entity query for a given entity type.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param string $conjunction
     *   The operator to use to combine conditions: 'AND' or 'OR'.
     *
     * @return \Drupal\Core\Entity\Query\QueryInterface
     *   An entity query for a specific configuration entity type.
     */
    public function get(EntityTypeInterface $entity_type, $conjunction);
    
    /**
     * Instantiates an aggregation query object for a given entity type.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param string $conjunction
     *   - AND: all of the conditions on the query need to match.
     *   - OR: at least one of the conditions on the query need to match.
     *
     * @return \Drupal\Core\Entity\Query\QueryAggregateInterface
     *   The query object that can query the given entity type.
     *
     * @throws \Drupal\Core\Entity\Query\QueryException
     */
    public function getAggregate(EntityTypeInterface $entity_type, $conjunction);

}