class BlockCustomTranslation

class BlockCustomTranslation extends DrupalSqlBase {
    use I18nQueryTrait;
    
    /**
     * Drupal 7 table names.
     */
    const CUSTOM_BLOCK_TABLE = 'block_custom';
    const I18N_STRING_TABLE = 'i18n_string';
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Build a query based on blockCustomTable table where each row has the
        // translation for only one property, either title or description. The
        // method prepareRow() is then used to obtain the translation for the
        // other property.
        $query = $this->select(static::CUSTOM_BLOCK_TABLE, 'b')
            ->fields('b', [
            'bid',
            'format',
            'body',
        ])
            ->fields('i18n', [
            'property',
        ])
            ->fields('lt', [
            'lid',
            'translation',
            'language',
        ])
            ->orderBy('b.bid');
        // Use 'title' for the info field to match the property name in
        // i18nStringTable.
        $query->addField('b', 'info', 'title');
        // Add in the property, which is either title or body. Cast the bid to text
        // so PostgreSQL can make the join.
        $query->leftJoin(static::I18N_STRING_TABLE, 'i18n', '[i18n].[objectid] = CAST([b].[bid] AS CHAR(255))');
        $query->condition('i18n.type', 'block');
        // Add in the translation for the property.
        $query->innerJoin('locales_target', 'lt', '[lt].[lid] = [i18n].[lid]');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        if (!parent::prepareRow($row)) {
            return FALSE;
        }
        // Set the i18n string table for use in I18nQueryTrait.
        $this->i18nStringTable = static::I18N_STRING_TABLE;
        // Save the translation for this property.
        $property_in_row = $row->getSourceProperty('property');
        // Get the translation for the property not already in the row and save it
        // in the row.
        $property_not_in_row = $property_in_row === 'title' ? 'body' : 'title';
        return $this->getPropertyNotInRowTranslation($row, $property_not_in_row, 'bid', $this->idMap);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'bid' => $this->t('The block numeric identifier.'),
            'format' => $this->t('Input format of the content block/box content.'),
            'lid' => $this->t('i18n_string table id'),
            'language' => $this->t('Language for this field.'),
            'property' => $this->t('Block property'),
            'translation' => $this->t('The translation of the value of "property".'),
            'title' => $this->t('Block title.'),
            'title_translated' => $this->t('Block title translation.'),
            'body' => $this->t('Block body.'),
            'body_translated' => $this->t('Block body translation.'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['bid']['type'] = 'integer';
        $ids['bid']['alias'] = 'b';
        $ids['language']['type'] = 'string';
        return $ids;
    }

}