Basic Query in Spring

[kartik sanghavi]

I am new to spring!!

I have got the source code of spring recipes book by gary mark.

In an application of bank I am trying to alter the Account class, AccountService interface and the AccountServiceImpl class to allow the setting of a credit limit on accounts and for withdrawals to be allowed up to that credit limit.

Plus I have to Alter the JUnit test in AccountServiceTests to test this new functionality.

How can I do this?

The original files are as under:

Account.java

package com.apress.springrecipes.bank;

public class Account {

    private String accountNo;
    private double balance;

    public Account() {}

    public Account(String accountNo, double balance) {
        this.accountNo = accountNo;
        this.balance = balance;
    }

    public String getAccountNo() {
        return accountNo;
    }

    public double getBalance() {
        return balance;
    }

    public void setAccountNo(String accountNo) {
        this.accountNo = accountNo;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public boolean equals(Object obj) {
        if (!(obj instanceof Account)) {
            return false;
        }
        Account account = (Account) obj;
        return account.accountNo.equals(accountNo) && account.balance == balance;
    }
}






AccountService

package com.apress.springrecipes.bank;

public interface AccountService {

    public void createAccount(String accountNo);
    public void removeAccount(String accountNo);
    public void deposit(String accountNo, double amount);
    public void withdraw(String accountNo, double amount);
    public double getBalance(String accountNo);
}



AccountServiceImpl

package com.apress.springrecipes.bank;

public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

    public AccountServiceImpl(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    public void createAccount(String accountNo) {
        accountDao.createAccount(new Account(accountNo, 0));
    }

    public void removeAccount(String accountNo) {
        Account account = accountDao.findAccount(accountNo);
        accountDao.removeAccount(account);
    }

    public void deposit(String accountNo, double amount) {
        Account account = accountDao.findAccount(accountNo);
        account.setBalance(account.getBalance() + amount);
        accountDao.updateAccount(account);
    }

    public void withdraw(String accountNo, double amount) {
        Account account = accountDao.findAccount(accountNo);
        if (account.getBalance() < amount) {
            throw new InsufficientBalanceException();
        }
        account.setBalance(account.getBalance() - amount);
        accountDao.updateAccount(account);
    }

    public double getBalance(String accountNo) {
        return accountDao.findAccount(accountNo).getBalance();
    }
}



AccountServiceTests

package com.apress.springrecipes.bank;

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class AccountServiceTests {

    private static final String TEST_ACCOUNT_NO = "1234";
    private AccountService accountService;

    @Before
    public void init() {
        accountService = new AccountServiceImpl(new InMemoryAccountDao());
        accountService.createAccount(TEST_ACCOUNT_NO);
        accountService.deposit(TEST_ACCOUNT_NO, 100);
    }

    @Test
    public void deposit() {
        accountService.deposit(TEST_ACCOUNT_NO, 50);
        assertEquals(accountService.getBalance(TEST_ACCOUNT_NO), 150, 0);
    }

    @Test
    public void withDraw() {
        accountService.withdraw(TEST_ACCOUNT_NO, 50);
        assertEquals(accountService.getBalance(TEST_ACCOUNT_NO), 50, 0);
    }

    @After
    public void cleanup() {
        accountService.removeAccount(TEST_ACCOUNT_NO);
    }
}

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