ViewState.java

// the states that the atm view can be in
public enum ViewState {
  // when the program starts for the first time (when it is idle and no
  // account has been entered)
  WELCOME_SCREEN_PUBLIC,

  // the card number is invalid
  INVALID_CARD_NUMBER,

  // user entered in the wrong pin
  INVALID_PIN,

  // user entered in the wrong pin more than the maximum amount
  TRIES_EXCEEDED,

  // there is no money in the user's account
  NO_MONEY_IN_ACCOUNT,

  // when the user inserts their card into the machine and is prompted
  // to enter in their pin
  WELCOME_SCREEN_CARD_AUTH,

  // the screen that asks if the user wants to withdraw or deposit, given
  // that they entered in the correct pin
  CARD_AUTHENTICATED,

  // when the user taps on withdraw
  WITHDRAW_WELCOME,

  // when the user clicks deposit
  DEPOSIT_WELCOME,

  // tells the user to put all of the money in one envelope, then
  // to press ok to open up the envelope slot
  DEPOSIT_ENVELOPE_CONFIRMATION,

  // any error with withdrawing
  WITHDRAW_ERROR,

  // an error with depositing
  DEPOSIT_ERROR,

  // the withdraw completed successfully
  WITHDRAW_SUCCESS,

  // tells the user to remove their card when they dip it
  // into the reader and it has been read
  REMOVE_CARD,

  // should only be used if none of the other cases apply
  GENERAL_TRANSACTION_ABORTED,

  // the withdraw was aborted
  WITHDRAW_ABORTED, DEPOSIT_ABORTED,

  // no money left, there is not enough money to complete the
  // transaction, or there is not the proper denomination available
  // to complete the transaction from the ATM's vault
  NO_MONEY_TO_DISPENSE,

  // something happened inside the machine that caused the bill that it was
  // processing to be rejected. This is only an issue if there are not enough
  // bills to complete the transaction
  INTERNAL_BILL_REJECTED,

  // the user has exceeded their daily withdraw limit
  DAILY_WITHDRAW_EXCEEDED,

  // the user is notified that a $2.50 fee will apply with
  // every transaction
  FEES_WILL_APPLY,

  // when the atm successfully authenticates
  CARD_VALID,

  // the card could not be read properly
  CARD_INVALID
}