public function getAvailableOperands(): array 	{ 		switch ($this->type) { 			case self::FILTER_TYPE_NUMBER: 			case self::FILTER_TYPE_RANGE:  				return ['=', '<', '>', '<=', '>=', '<>'];  			case self::FILTER_TYPE_TEXT: 			case self::FILTER_TYPE_EMAIL: 			case self::FILTER_TYPE_TEL: 			case self::FILTER_TYPE_URL: 			case self::FILTER_TYPE_COLOR: 			case self::FILTER_TYPE_TEXTAREA:  				return ['=', '<>', 'like'];  			case self::FILTER_TYPE_SELECT:  				return ['='];  			default:  				return ['=', '<', '>', '<=', '>=', '<>', 'like']; 		} 	}