eZ\Bundle\EzPublishMigrationBundle\Command\LegacyStorage\RegenerateUrlAliasesCommand::backupCustomLocationAliases PHP Method

    protected function backupCustomLocationAliases()
    {
        $table = static::CUSTOM_ALIAS_BACKUP_TABLE;
        if (!$this->tableExists($table)) {
            $this->createCustomLocationUrlAliasBackupTable();
        }
        if (!$this->isTableEmpty($table)) {
            throw new RuntimeException("Table '{$table}' contains data. " . "Ensure it's empty or non-existent (it will be automatically created).");
        }
        $this->doBackupCustomLocationAliases();
    }