FileField.php

<?php

namespace Drupal\file\Plugin\migrate\field\d6;

use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate\Row;
use Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase;

/**
 * @MigrateField(
 *   id = "filefield",
 *   core = {6},
 *   source_module = "filefield",
 *   destination_module = "file"
 * )
 */
class FileField extends FieldPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFieldWidgetMap() {
        return [
            'filefield_widget' => 'file_generic',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldFormatterMap() {
        return [
            'default' => 'file_default',
            'url_plain' => 'file_url_plain',
            'path_plain' => 'file_url_plain',
            'image_plain' => 'image',
            'image_nodelink' => 'image',
            'image_imagelink' => 'image',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function defineValueProcessPipeline(MigrationInterface $migration, $field_name, $data) {
        $process = [
            'plugin' => 'd6_field_file',
            'source' => $field_name,
        ];
        $migration->mergeProcessOfProperty($field_name, $process);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldType(Row $row) {
        return $row->getSourceProperty('widget_type') == 'imagefield_widget' ? 'image' : 'file';
    }

}