Method registerTask

/**
 * Register (map) a task to a method in the class.
 *
 * @param   string  $task    The task.
 * @param   string  $method  The name of the method in the derived class to perform for this task.
 *
 * @return  static  A \JControllerLegacy object to support chaining.
 *
 * @since   3.0
 */
public function registerTask($task, $method)
{
    if (\in_array(strtolower($method), $this->methods)) {
        $this->taskMap[strtolower($task)] = $method;
    }
    return $this;
}