/**
* Simulate processing of a transfer
*
* @param message the message describing the transfer requested
* @param balances (out) balances in "to" account after transfer
* @return status code derived from current values
*/
private Status transfer(Message message, Balances balances) {
int cardNumber = message.getCard().getNumber();
int fromAccountNumber = ACCOUNT_NUMBER[cardNumber][message.getFromAccount()];
if (fromAccountNumber == 0) return new Failure("Invalid from account type");
int toAccountNumber = ACCOUNT_NUMBER[cardNumber][message.getToAccount()];
if (toAccountNumber == 0) return new Failure("Invalid to account type");
if (fromAccountNumber == toAccountNumber)
return new Failure("Can't transfer money from\n" + "an account to itself");
Money amount = message.getAmount();
if (!amount.lessEqual(AVAILABLE_BALANCE[fromAccountNumber]))
return new Failure("Insufficient available balance");
// Update account balances once we know everything is OK
BALANCE[fromAccountNumber].subtract(amount);
AVAILABLE_BALANCE[fromAccountNumber].subtract(amount);
BALANCE[toAccountNumber].add(amount);
AVAILABLE_BALANCE[toAccountNumber].add(amount);
// Return updated balances
balances.setBalances(BALANCE[toAccountNumber], AVAILABLE_BALANCE[toAccountNumber]);
return new Success();
}
/**
* Simulate initiation of a deposit. At this point, the bank only approves the validity of the
* deposit - no changes to the records are made until the envelope is actually inserted
*
* @param message the message describing the deposit requested
* @return status code derived from current values
*/
private Status initiateDeposit(Message message) {
int cardNumber = message.getCard().getNumber();
int accountNumber = ACCOUNT_NUMBER[cardNumber][message.getToAccount()];
if (accountNumber == 0) return new Failure("Invalid account type");
// Don't update anything yet
return new Success();
}
/**
* Simulate completion of a deposit
*
* @param message the message describing the deposit requested
* @param balances (out) balances (not updated until completed)
* @return status code - must always be success in this case
*/
private Status completeDeposit(Message message, Balances balances) {
int cardNumber = message.getCard().getNumber();
int accountNumber = ACCOUNT_NUMBER[cardNumber][message.getToAccount()];
if (accountNumber == 0) return new Failure("Invalid account type");
// Now we can update the balance
Money amount = message.getAmount();
BALANCE[accountNumber].add(amount);
// Return updated balances
balances.setBalances(BALANCE[accountNumber], AVAILABLE_BALANCE[accountNumber]);
return new Success();
}