interface MigrateDestinationInterface

interface MigrateDestinationInterface extends PluginInspectionInterface {
    
    /**
     * Gets the destination IDs.
     *
     * To support MigrateIdMap maps, derived destination classes should return
     * field definition(s) corresponding to the primary key of the destination
     * being implemented. These are used to construct the destination key fields
     * of the map table for a migration using this destination.
     *
     * @return array[]
     *   An associative array of field definitions keyed by field ID. Values are
     *   associative arrays with a structure that contains the field type ('type'
     *   key). The other keys are the field storage settings as they are returned
     *   by FieldStorageDefinitionInterface::getSettings(). As an example, for a
     *   composite destination primary key that is defined by an integer and a
     *   string, the returned value might look like:
     *   @code
     *     return [
     *       'id' => [
     *         'type' => 'integer',
     *         'unsigned' => FALSE,
     *         'size' => 'big',
     *       ],
     *       'version' => [
     *         'type' => 'string',
     *         'max_length' => 64,
     *         'is_ascii' => TRUE,
     *       ],
     *     ];
     *   @endcode
     *   If 'type' points to a field plugin with multiple columns and needs to
     *   refer to a column different than 'value', the key of that column will be
     *   appended as a suffix to the plugin name, separated by dot ('.'). Example:
     *   @code
     *     return [
     *       'format' => [
     *         'type' => 'text.format',
     *       ],
     *     ];
     *   @endcode
     *   Additional custom keys/values, that are not part of field storage
     *   definition, can be passed in definitions:
     *   @code
     *     return [
     *       'nid' => [
     *         'type' => 'integer',
     *         'custom_setting' => 'some_value',
     *       ],
     *     ];
     *   @endcode
     *
     * @see \Drupal\Core\Field\FieldStorageDefinitionInterface::getSettings()
     * @see \Drupal\Core\Field\Plugin\Field\FieldType\IntegerItem
     * @see \Drupal\Core\Field\Plugin\Field\FieldType\StringItem
     * @see \Drupal\text\Plugin\Field\FieldType\TextItem
     */
    public function getIds();
    
    /**
     * Returns an array of destination fields.
     *
     * Derived classes must implement fields(), returning a list of available
     * destination fields.
     *
     * @return array
     *   - Keys: machine names of the fields
     *   - Values: Human-friendly descriptions of the fields.
     */
    public function fields();
    
    /**
     * Import the row.
     *
     * Derived classes must implement import(), to construct one new object
     * (pre-populated) using ID mappings in the Migration.
     *
     * @param \Drupal\migrate\Row $row
     *   The row object.
     * @param array $old_destination_id_values
     *   (optional) The old destination IDs. Defaults to an empty array.
     *
     * @return array|bool
     *   An indexed array of destination IDs in the same order as defined in the
     *   plugin's getIds() method if the plugin wants to save the IDs to the ID
     *   map, TRUE to indicate success without saving IDs to the ID map, or
     *   FALSE to indicate a failure.
     *
     * @throws \Drupal\migrate\MigrateException
     *   Throws an exception if there is a problem importing the row. By default,
     *   this causes the migration system to treat this row as having failed;
     *   however, any \Drupal\migrate\Plugin\MigrateIdMapInterface status constant
     *   can be set using the $status parameter of
     *   \Drupal\migrate\MigrateException, such as
     *   \Drupal\migrate\Plugin\MigrateIdMapInterface::STATUS_IGNORED.
     */
    public function import(Row $row, array $old_destination_id_values = []);
    
    /**
     * Delete the specified destination object from the target Drupal.
     *
     * @param array $destination_identifier
     *   The ID of the destination object to delete.
     */
    public function rollback(array $destination_identifier);
    
    /**
     * Whether the destination can be rolled back or not.
     *
     * @return bool
     *   TRUE if rollback is supported, FALSE if not.
     */
    public function supportsRollback();
    
    /**
     * The rollback action for the last imported item.
     *
     * @return int
     *   The MigrateIdMapInterface::ROLLBACK_ constant indicating how an imported
     *   item should be handled on rollback.
     */
    public function rollbackAction();
    
    /**
     * Gets the destination module handling the destination data.
     *
     * @return string|null
     *   The destination module or NULL if not found.
     */
    public function getDestinationModule();

}