VocabularyPerType.php

<?php

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

use Drupal\migrate\Row;

/**
 * Gets all the vocabularies based on the node types that have Taxonomy enabled.
 *
 * @MigrateSource(
 *   id = "d6_taxonomy_vocabulary_per_type",
 *   source_module = "taxonomy"
 * )
 */
class VocabularyPerType extends Vocabulary {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = parent::query();
        $query->join('vocabulary_node_types', 'nt', 'v.vid = nt.vid');
        $query->fields('nt', [
            'type',
        ]);
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        // Get the i18n taxonomy translation setting for this vocabulary.
        // 0 - No multilingual options
        // 1 - Localizable terms. Run through the localization system.
        // 2 - Predefined language for a vocabulary and its terms.
        // 3 - Per-language terms, translatable (referencing terms with different
        // languages) but not localizable.
        $i18ntaxonomy_vocab = $this->variableGet('i18ntaxonomy_vocabulary', []);
        $vid = $row->getSourceProperty('vid');
        $i18ntaxonomy_vocabulary = FALSE;
        if (array_key_exists($vid, $i18ntaxonomy_vocab)) {
            $i18ntaxonomy_vocabulary = $i18ntaxonomy_vocab[$vid];
        }
        $row->setSourceProperty('i18ntaxonomy_vocabulary', $i18ntaxonomy_vocabulary);
        return parent::prepareRow($row);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['vid']['type'] = 'integer';
        $ids['vid']['alias'] = 'nt';
        $ids['type']['type'] = 'string';
        return $ids;
    }

}