banking.java

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package itso.webserv.model;

import itso.bank.exception.AccountDoesNotExistException;
import itso.bank.exception.BankException;
import itso.bank.exception.InsufficientFundsException;
import itso.bank.exception.ZeroAmountException;
import itso.bank.model.Account;
import itso.bank.model.TransRecord;

import java.math.BigDecimal;

/**
 * Facade to access the Account, perform credits and debits.
 * 
 * @author Ian Brown, modified by Ueli Wahli
 */

public class Banking  {

	/**
	 * Deposit funds into a bank account
	 */
	public void deposit(String accountId, BigDecimal amount)
		throws AccountDoesNotExistException, ZeroAmountException {
		
		AccountDB accountDB = AccountDB.getInstance();
		accountDB.credit(accountId, amount);
	}

	/**
	 * Withdraw funds from a bank account
	 */
	public void withdraw(String accountId, BigDecimal amount)
		throws AccountDoesNotExistException, ZeroAmountException, InsufficientFundsException, BankException {
		
		AccountDB accountDB = AccountDB.getInstance();
		Account account = accountDB.getAccount(accountId);
		if (account.getBalance().compareTo(amount) == -1)
			throw new InsufficientFundsException();
		accountDB.debit(accountId, amount);
	}

	/**
	 * Transfer funds from a bank account to another
	 */
	public void transfer(String accountId1, String accountId2, BigDecimal amount)
		throws AccountDoesNotExistException, ZeroAmountException, InsufficientFundsException, BankException {
		
		AccountDB accountDB = AccountDB.getInstance();
		Account account1 = accountDB.getAccount(accountId1);
		Account account2 = accountDB.getAccount(accountId2);
		if (account1.getBalance().compareTo(amount) == -1)
			throw new InsufficientFundsException();
		accountDB.debit(accountId1, amount);
		accountDB.credit(accountId2, amount);
	}

	/**
	 * Get details about a bank account
	 */
	public Account getAccount(String accountId)
		throws AccountDoesNotExistException, BankException {

		AccountDB accountDB = AccountDB.getInstance();
		Account account = accountDB.getAccount(accountId);
		return account;
	}

	/**
	 * Get transaction records for a bank account
	 */
	public TransRecord[] getTransactions(String accountId)
		throws BankException {

		AccountDB accountDB = AccountDB.getInstance();
		TransRecord[] tr = accountDB.getTransactions(accountId);
		return tr;
	}
}