TYPO3 / Fluid

     * @throws Exception

     * @api

     */

    protected function registerArgument($name, $type, $description, $required = false, $defaultValue = null)

    {

        if (array_key_exists($name, $this->argumentDefinitions)) {

            throw new Exception('Argument "' . $name . '" has already been defined, thus it should not be defined again.', 1253036401);

        }

        $this->argumentDefinitions[$name] = new ArgumentDefinition($name, $type, $description, $required, $defaultValue);

        return $this;

    }

    /**

     * Register a new argument. Call this method from your ViewHelper subclass

     * @throws Exception

     * @api

     */

    protected function overrideArgument($name, $type, $description, $required = false, $defaultValue = null)

    {

        if (!array_key_exists($name, $this->argumentDefinitions)) {

            throw new Exception('Argument "' . $name . '" has not been defined, thus it can\'t be overridden.', 1279212461);

        }

        $this->argumentDefinitions[$name] = new ArgumentDefinition($name, $type, $description, $required, $defaultValue);

        return $this;

    }

    /**

     * Sets all needed attributes needed for the rendering. Called by the