FieldLabelDescriptionTranslation.php

<?php

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

use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;

/**
 * Drupal 6 i18n field label and description source from database.
 *
 * For available configuration keys, refer to the parent classes.
 *
 * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
 * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
 *
 * @MigrateSource(
 *   id = "d6_field_instance_label_description_translation",
 *   source_module = "i18ncck"
 * )
 */
class FieldLabelDescriptionTranslation extends DrupalSqlBase {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Get translations for field labels and descriptions.
        $query = $this->select('i18n_strings', 'i18n')
            ->fields('i18n', [
            'property',
            'objectid',
            'type',
        ])
            ->fields('lt', [
            'lid',
            'translation',
            'language',
        ])
            ->condition('i18n.type', 'field');
        $condition = $query->orConditionGroup()
            ->condition('property', 'widget_label')
            ->condition('property', 'widget_description');
        $query->condition($condition);
        $query->innerJoin('locales_target', 'lt', '[lt].[lid] = [i18n].[lid]');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'property' => $this->t('Profile field ID.'),
            'lid' => $this->t('Locales target language ID.'),
            'language' => $this->t('Language for this field.'),
            'translation' => $this->t('Translation of either the title or explanation.'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['property']['type'] = 'string';
        $ids['language']['type'] = 'string';
        $ids['lid']['type'] = 'integer';
        $ids['lid']['alias'] = 'lt';
        return $ids;
    }

}