public function build()
	{
		parent::build();

		//set the upload url depending on the type of config this is
		$url = $this->validator->getUrlInstance();
		$route = $this->config->getType() === 'settings' ? 'admin_settings_file_upload' : 'admin_file_upload';

		//set the upload url to the proper route
		$this->suppliedOptions['upload_url'] = $url->route($route, array($this->config->getOption('name'), $this->suppliedOptions['field_name']));
	}