Packages

c

o1.auctionhouse

FixedPriceSale

class FixedPriceSale extends AnyRef

Each instance of the class FixedPriceSale represents an item that has been put up for sale in an (imaginary) electronic auction house. Each such item is being sold for a fixed price (as opposed to being auctioned).

Apart from a price, each sale has a duration measured in days. Every day, the method advanceOneDay must be called. If the set number of days is reached without anyone buying the item, the sale expires and the item can no longer be bought.

This simple class does not store any seller information.

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AnyRef, Any
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Visibility
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Instance Constructors

  1. new FixedPriceSale(description: String, price: Int, duration: Int)

    description

    a short description of the item

    price

    the price the item is being sold for

    duration

    the maximum number of days the sale will remain open

Value Members

  1. def advanceOneDay(): Unit

    Records one day as having passed.

    Records one day as having passed. In practice, what this means is that the item becomes one day closer to expiring, unless it had already been bought in which case its state does not change.

  2. def buy(buyer: String): Boolean

    Buys the item for the given customer.

    Buys the item for the given customer. The sale now has a buyer (and is therefore no longer open). This only works, however, if the sale was open to begin with. The method returns true if the item was successfully bought, false if the purchase failed.

  3. def buyer: Option[String]

    Returns the buyer of the item, wrapped in an Option; None is returned if nobody has bought the item yet.

  4. def daysLeft: Int

    Returns the number of days remaining until the sale expires, unless someone buys the item.

    Returns the number of days remaining until the sale expires, unless someone buys the item. Initially, this number will be equal to the sale's duration, but will decrease with each passing day until it reaches zero or the item is bought.

    If the item has been already bought when this method is called, the number of days that were remaining at the time of purchase is returned. A return value of zero means that time has already run out to buy the item.

  5. val description: String
  6. def isExpired: Boolean

    Determines whether the sale has expired.

    Determines whether the sale has expired. That is, determines whether the item is no longer available because time has run out. Note that if the item is unavailable because it was bought, it has not "expired" in this sense and this method will return false.

  7. def isOpen: Boolean

    Determines if the sale is open, that is, if the item can still be bought.

    Determines if the sale is open, that is, if the item can still be bought. A fixed-price sale is always open if nobody has yet bought the item and the sale has not yet expired.

  8. val price: Int
  9. def toString: String

    Returns a textual description of the item.

    Returns a textual description of the item. This text is the same as that returned by description.

    Definition Classes
    FixedPriceSale → AnyRef → Any