interface MigrateProcessInterface

interface MigrateProcessInterface extends PluginInspectionInterface {
    
    /**
     * Performs the associated process.
     *
     * @param mixed $value
     *   The value to be transformed.
     * @param \Drupal\migrate\MigrateExecutableInterface $migrate_executable
     *   The migration in which this process is being executed.
     * @param \Drupal\migrate\Row $row
     *   The row from the source to process. Normally, just transforming the value
     *   is adequate but very rarely you might need to change two columns at the
     *   same time or something like that.
     * @param string $destination_property
     *   The destination property currently worked on. This is only used together
     *   with the $row above.
     *
     * @return mixed
     *   The newly transformed value.
     */
    public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property);
    
    /**
     * Indicates whether the returned value requires multiple handling.
     *
     * @return bool
     *   TRUE when the returned value contains a list of values to be processed.
     *   For example, when the 'source' property is a string and the value found
     *   is an array.
     */
    public function multiple();

}