Sets the quantity of this OrderLineItem.
        The quantity purchased, as a string representation of a number.  This string must have a positive integer value.

        :param quantity: The quantity of this OrderLineItem.
        :type: str

def quantity(self, quantity):
        """
        Sets the quantity of this OrderLineItem.
        The quantity purchased, as a string representation of a number.  This string must have a positive integer value.

        :param quantity: The quantity of this OrderLineItem.
        :type: str
        """

        if quantity is None:
            raise ValueError("Invalid value for `quantity`, must not be `None`")
        if len(quantity) > 5:
            raise ValueError("Invalid value for `quantity`, length must be less than `5`")
        if len(quantity) < 1:
            raise ValueError("Invalid value for `quantity`, length must be greater than or equal to `1`")

        self._quantity = quantity