feat: implement bank account system with audit logging to BankATM

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/AuditLog.java

@@ -0,0 +1,22 @@
+package com.codedifferently.lesson17.bank;
+
+
+import java.util.ArrayList;
+
+public class AuditLog {
+    private List<String> logEntries = new ArrayList<>(); 
+
+    public void log (String message) {
+        logEntries.add(message);
+        System.out.println(message);
+
+    }
+
+    public List<String> getEntries() {
+        return logEntries;
+    }
+
+    public void clear() {
+        logEntries.clear();
+    }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAccount.java

@@ -0,0 +1,31 @@
+package com.codedifferently.lesson17.bank;
+/*  We want to support a Savings Account that works just like CheckinAccount,
+ *  But will not allow you to write checks aainst the account.
+ * 
+ *  We want the BankAtm class to support the concept of a Business Checking Account
+ *  A business acount will require that at least ne of the owning accoutns is a business account.
+ *  
+ */
+
+public abstract class BankAccount {
+    protected String accountNumber;
+    protected double balance;
+
+    public abstract void deposit(double amount, String method);
+    public abstract void withdraw(double amount);
+
+    public double getBalance() {
+        return balance;
+    }
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    //Follows LSP 
+    public interface depositable {
+        void deposit(double amount, String method);
+    }
+    public interface withdrawable {
+        void withdraw(double amount);
+    }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAtm.java

@@ -1,17 +1,18 @@
 package com.codedifferently.lesson17.bank;
 
-import com.codedifferently.lesson17.bank.exceptions.AccountNotFoundException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 
+import com.codedifferently.lesson17.bank.exceptions.AccountNotFoundException;
+
 /** Represents a bank ATM. */
 public class BankAtm {
 
   private final Map<UUID, Customer> customerById = new HashMap<>();
   private final Map<String, CheckingAccount> accountByNumber = new HashMap<>();
-
+  private final AuditLog auditLog = new AuditLog();
   /**
    * Adds a checking account to the bank.
    *
@@ -48,6 +49,7 @@ public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
   public void depositFunds(String accountNumber, double amount) {
     CheckingAccount account = getAccountOrThrow(accountNumber);
     account.deposit(amount);
+    auditLog.log("Deposited " + amount + " into account " + accountNumber);
   }
 
   /**
@@ -58,8 +60,11 @@ public void depositFunds(String accountNumber, double amount) {
    */
   public void depositFunds(String accountNumber, Check check) {
     CheckingAccount account = getAccountOrThrow(accountNumber);
+
     check.depositFunds(account);
-  }
+    auditLog.log("Deposited check into account " + accountNumber);
+
+    }
 
   /**
    * Withdraws funds from an account.

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/SavingsAccount.java

@@ -0,0 +1,18 @@
+//Only Allows Deposits when accessing Atm on your Savings Account
+
+public class SavingsAccount extends BankAccount {
+
+    @Override
+    public void deposit(double amount, String method) {
+        if("check".equalsIgnoreCase(method)) {
+            throw new UnsupportedOperationException("Deposit not allowed");
+        }
+
+        this.balance += amount;
+    }
+
+    @Override
+    public void withdraw(double amount) {
+       throw new IllegalArgumentException("Insufficient funds"); 
+    }
+}