feat: adds business checking account boolean to customer, and exception in bankATM

Author: AmiyahJo

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

@@ -1,11 +1,12 @@
 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 {
 
@@ -18,6 +19,20 @@ public class BankAtm {
    * @param account The account to add.
    */
   public void addAccount(CheckingAccount account) {
+    if (account instanceof BusinessCheckingAccount) {
+      boolean hasBusinessAccount = false;
+      for (Customer owner : account.getOwners()) {
+          Customer customer = customerById.get(owner.getId());
+          if (customer != null && customer.hasBusinessAccount()) {
+            hasBusinessAccount = true;
+            break;
+          }
+        }
+        if (!hasBusinessAccount) {
+          throw new IllegalArgumentException("At least one owning account must be a business account.");
+        }
+      } 
+      
     accountByNumber.put(account.getAccountNumber(), account);
     account
         .getOwners()
@@ -27,6 +42,7 @@ public void addAccount(CheckingAccount account) {
             });
   }
 
+
   /**
    * Finds all accounts owned by a customer.
    *

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

@@ -58,6 +58,20 @@ public Set<CheckingAccount> getAccounts() {
     return accounts;
   }
 
+  /**
+   * Checks if the customer has at least one business account.
+   *
+   * @return true if the customer has a business account, false otherwise.
+   */  
+  public boolean hasBusinessAccount() {
+    for (CheckingAccount account : accounts) {
+      if (account instanceof BusinessCheckingAccount) {
+        return true; // Found a business account
+      }
+    }
+    return false;
+  }
+
   @Override
   public int hashCode() {
     return id.hashCode();