bank

Class OfflineAccountProxy

java.lang.Object

bank.Account

bank.OfflineAccountProxy

public class OfflineAccountProxy
extends Account

Class for representing accounts in an ATM that is switched offline. All transactions are buffered in this situation and can later be replayed to copy them to the actual account. The class realises a limit of 1000 bucks that can at most be withdrawn before transactions have to be replayed to the permanent account. Objects of this class are created when an account is accessed for the first time at an offline ATM and are deleted once the ATM gets online again

Field Summary

Fields inherited from class bank.Account

accountNumber, transactions

Constructor Summary

Constructors

Constructor and Description
OfflineAccountProxy(int accountNumber)

Method Summary

Methods

Modifier and Type	Method and Description
int	accountBalance()
boolean	balanceIsAccessible()
boolean	newWithdrawalIsPossible(int amount) Determine whether a certain amount of money may be withdrawn.
void	replay(PermanentAccount target) Make the transactions buffered in this object persistent by copying them to a permanent account
void	requestStatement() Request a printed account statement.
void	withdraw(int amount) Withdraw amount from the account

Methods inherited from class bank.Account

addTransaction, checkAndWithdraw, flushTransactions, getAccountNumber, getTransactions, transactionListToString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OfflineAccountProxy

public OfflineAccountProxy(int accountNumber)

Method Detail

withdraw

public void withdraw(int amount)

Withdraw amount from the account

Specified by:

withdraw in class Account

Parameters:

amount - the amount to be withdrawn

requestStatement

public void requestStatement()

Request a printed account statement. This request may fail at a late point if the account is offline, in this case nothing happens (the customer does not receive anything). For this reason the method does not have any preconditions

Specified by:

requestStatement in class Account

balanceIsAccessible

public boolean balanceIsAccessible()

Specified by:

balanceIsAccessible in class Account

Returns:

true iff the balance of this account can be determined (not possible for the offline situation)

accountBalance

public int accountBalance()

Specified by:

accountBalance in class Account

Returns:

the balance of this account

newWithdrawalIsPossible

public boolean newWithdrawalIsPossible(int amount)

Determine whether a certain amount of money may be withdrawn. Using method PermanentAccount.withdraw(int,int) it is possible to circumvent this check, which is necessary because for offline withdrawals the balance cannot be accessed and checked

Specified by:

newWithdrawalIsPossible in class Account

Parameters:

amount - the amount of money requested

Returns:

true iff amount can be withdrawn from the account

replay

public void replay(PermanentAccount target)

Make the transactions buffered in this object persistent by copying them to a permanent account

Parameters:

target - the account the transactions are supposed to be copied to