LinkField.php

<?php

namespace Drupal\link\Plugin\migrate\cckfield;

@trigger_error('LinkField is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \\Drupal\\link\\Plugin\\migrate\\field\\d6\\LinkField instead.', E_USER_DEPRECATED);
use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate_drupal\Plugin\migrate\cckfield\CckFieldPluginBase;

/**
 * @MigrateCckField(
 *   id = "link",
 *   core = {6},
 *   type_map = {
 *     "link_field" = "link"
 *   },
 *   source_module = "link",
 *   destination_module = "link"
 * )
 *
 * @deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use
 * \Drupal\link\Plugin\migrate\field\d6\LinkField instead.
 *
 * @see https://www.drupal.org/node/2751897
 */
class LinkField extends CckFieldPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFieldFormatterMap() {
        // See d6_field_formatter_settings.yml and FieldPluginBase
        // alterFieldFormatterMigration().
        return [
            'default' => 'link',
            'plain' => 'link',
            'absolute' => 'link',
            'title_plain' => 'link',
            'url' => 'link',
            'short' => 'link',
            'label' => 'link',
            'separate' => 'link_separate',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function processCckFieldValues(MigrationInterface $migration, $field_name, $data) {
        $process = [
            'plugin' => 'd6_cck_link',
            'source' => $field_name,
        ];
        $migration->mergeProcessOfProperty($field_name, $process);
    }

}