topdown.service
Class BankMemDB

java.lang.Object
  topdown.service.BankMemDB

All Implemented Interfaces:

Bank

public class BankMemDB

extends java.lang.Object

implements Bank

An in-memory bank implementation.

Field Summary

private static BankMemDB	DB_INSTANCE The bank singleton.
private java.util.List	m_accounts The list of accounts managed by this bank.

Constructor Summary

private

BankMemDB() Creates a bank instance.

Method Summary

java.lang.String	addNewAccount(java.lang.String name, float initBalance) Adds a new account.
Account	getAccount(java.lang.String id) Returns the account that has the given ID.
java.util.List	getAccounts() Returns a list of all account in the bank.
static BankMemDB	newInstance() Provides access to the bank singleton.

Methods inherited from class java.lang.Object

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

Field Detail

DB_INSTANCE

private static BankMemDB DB_INSTANCE

The bank singleton.

m_accounts

private java.util.List m_accounts

The list of accounts managed by this bank.

Constructor Detail

BankMemDB

private BankMemDB()

Creates a bank instance.

Method Detail

newInstance

public static BankMemDB newInstance()

Provides access to the bank singleton.

Returns:

the bank instance.

addNewAccount

public java.lang.String addNewAccount(java.lang.String name,
                                      float initBalance)
                               throws AccountException

Adds a new account.

Specified by:

addNewAccount in interface Bank

Parameters:

name - the account owner's name.

initBalance - the initial balance for the account.

Returns:

the generated account ID.

Throws:

AccountException - if the initial balance is insufficent (<= 0).

getAccount

public Account getAccount(java.lang.String id)

Returns the account that has the given ID.

Specified by:

getAccount in interface Bank

Parameters:

id - the account ID.

Returns:

the account.

getAccounts

public java.util.List getAccounts()

Returns a list of all account in the bank.

Specified by:

getAccounts in interface Bank

Returns:

the list of accounts.