class TermEntityTranslation

class TermEntityTranslation extends FieldableEntity {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = $this->select('entity_translation', 'et')
            ->fields('et')
            ->fields('td', [
            'name',
            'description',
            'format',
        ])
            ->fields('tv', [
            'machine_name',
        ])
            ->condition('et.entity_type', 'taxonomy_term')
            ->condition('et.source', '', '<>');
        $query->innerJoin('taxonomy_term_data', 'td', '[td].[tid] = [et].[entity_id]');
        $query->innerJoin('taxonomy_vocabulary', 'tv', '[td].[vid] = [tv].[vid]');
        if (isset($this->configuration['bundle'])) {
            $query->condition('tv.machine_name', (array) $this->configuration['bundle'], 'IN');
        }
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        $tid = $row->getSourceProperty('entity_id');
        $vocabulary = $row->getSourceProperty('machine_name');
        $language = $row->getSourceProperty('language');
        // Get Field API field values.
        foreach ($this->getFields('taxonomy_term', $vocabulary) as $field_name => $field) {
            // Ensure we're using the right language if the entity is translatable.
            $field_language = $field['translatable'] ? $language : NULL;
            $row->setSourceProperty($field_name, $this->getFieldValues('taxonomy_term', $field_name, $tid, NULL, $field_language));
        }
        // If the term name or term description were replaced by real fields using
        // the Drupal 7 Title module, use the fields value instead of the term name
        // or term description.
        if ($this->moduleExists('title')) {
            $name_field = $row->getSourceProperty('name_field');
            if (isset($name_field[0]['value'])) {
                $row->setSourceProperty('name', $name_field[0]['value']);
            }
            $description_field = $row->getSourceProperty('description_field');
            if (isset($description_field[0]['value'])) {
                $row->setSourceProperty('description', $description_field[0]['value']);
            }
            if (isset($description_field[0]['format'])) {
                $row->setSourceProperty('format', $description_field[0]['format']);
            }
        }
        return parent::prepareRow($row);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'entity_type' => $this->t('The entity type this translation relates to'),
            'entity_id' => $this->t('The entity ID this translation relates to'),
            'revision_id' => $this->t('The entity revision ID this translation relates to'),
            'language' => $this->t('The target language for this translation.'),
            'source' => $this->t('The source language from which this translation was created.'),
            'uid' => $this->t('The author of this translation.'),
            'status' => $this->t('Boolean indicating whether the translation is published (visible to non-administrators).'),
            'translate' => $this->t('A boolean indicating whether this translation needs to be updated.'),
            'created' => $this->t('The Unix timestamp when the translation was created.'),
            'changed' => $this->t('The Unix timestamp when the translation was most recently saved.'),
            'name' => $this->t('The name of the term.'),
            'description' => $this->t('The term description.'),
            'format' => $this->t('Format of the term description.'),
            'machine_name' => $this->t('Vocabulary machine name'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        return [
            'entity_id' => [
                'type' => 'integer',
                'alias' => 'et',
            ],
            'language' => [
                'type' => 'string',
                'alias' => 'et',
            ],
        ];
    }

}