correction ue7

uebung07/src/oop/ch05/mensa/AccountCard.java

@@ -17,7 +17,7 @@ public class AccountCard extends MensaCard {
     }
 
     public void setAccount(SecurityClient client, String account) throws AuthorizationException {
-    if (account == null || account.trim().length() == 0)
+        if (account == null || account.trim().isEmpty())
             throw new IllegalArgumentException("Invalid account " + account);
         this.account.setContent(client, account);
     }
@@ -28,7 +28,7 @@ public class AccountCard extends MensaCard {
     }
 
     @Override
-  public void pass(CashPoint cashPoint) {
+    public void pass(CashPoint cashPoint) throws RejectedException, AuthorizationException {
         cashPoint.charge(this);
     }
 }

uebung07/src/oop/ch05/mensa/AccountManagement.java

@@ -0,0 +1,51 @@
+package oop.ch05.mensa;
+
+import oop.ch05.secured.AuthorizationException;
+
+import java.util.Map;
+import java.util.Random;
+import java.util.TreeMap;
+
+public class AccountManagement {
+    private final int password;
+    public final String name;
+    private final Random random = new Random();
+    private final Map<String, Integer> accounts = new TreeMap<>();
+
+    public AccountManagement(int password, String name) {
+        this.password = password;
+        this.name = name;
+    }
+
+    public void deposit(String account, int euros) {
+        final int amount = accounts.getOrDefault(account, 0);
+        accounts.put(account, amount + 100 * euros);
+    }
+
+    public void pay(AccountCard card, int price, CashPoint cashPoint) throws RejectedException, AuthorizationException {
+        final int amount = accounts.getOrDefault(card.getAccount(), 0);
+        final int challenge = nextChallenge();
+        if (cashPoint.challengeResponse(challenge) != requiredResponse(challenge))
+            throw new AuthorizationException(cashPoint + " is not authorized to access accounts on " + name);
+        if (amount < price)
+            throw new RejectedException(card + " bounced");
+        accounts.put(card.getAccount(), amount - price);
+    }
+
+    public int getAmount(String account) {
+        return accounts.getOrDefault(account, 0);
+    }
+
+    private int nextChallenge() {
+        return random.nextInt();
+    }
+
+    private int requiredResponse(int challenge) {
+        return challenge ^ password;
+    }
+
+    @Override
+    public String toString() {
+        return "Account Management " + name + " " + accounts;
+    }
+}

uebung07/src/oop/ch05/mensa/CashPoint.java

@@ -6,17 +6,16 @@ import oop.ch05.secured.SecurityClient;
 public class CashPoint implements SecurityClient {
     private final int password;
     public final String name;
+    private final AccountManagement accountMgmt;
     private int counter;
     private int cents;
 
-  public CashPoint(String name, int password) {
+    public CashPoint(String name, int password, AccountManagement accountMgmt) {
         this.name = name;
         this.password = password;
-    this.counter = 0;
-    this.cents = 0;
+        this.accountMgmt = accountMgmt;
     }
 
-  @Override
     public int challengeResponse(int challenge) {
         return challenge ^ password;
     }
@@ -56,15 +55,11 @@ public class CashPoint implements SecurityClient {
         cents += price;
     }
 
-  void charge(AccountCard accountCard) {
+    void charge(AccountCard accountCard) throws RejectedException, AuthorizationException {
         final int price = getPrice(accountCard.color);
-    // zahlen methode 
-    /*
-
-      zahlen bein acmgmt
-
-     */
         System.out.println("Charging " + price + " cents on account " + accountCard.getAccount());
+        accountMgmt.pay(accountCard, price, this);
+        count(accountCard);
         cents += price;
     }
 }

uebung07/src/oop/ch05/mensa/MensaExample.java

@@ -4,10 +4,11 @@ import oop.ch05.secured.AuthorizationException;
 
 public class MensaExample {
   public static void main(String[] args) {
+    AccountManagement mgmt = new AccountManagement(4711, "Uni");
     VendingMachine vm1 = new VendingMachine("left", 4711);
     VendingMachine vm2 = new VendingMachine("right", 4711);
     VendingMachine tumVM = new VendingMachine("TUM Mensa", 3141);
-    CashPoint unibwMensa = new CashPoint("UniBw Mensa", 4711);
+    CashPoint unibwMensa = new CashPoint("UniBw Mensa", 4711, mgmt);
 
     AccountCard conf = new AccountCard("conference", "33-1298", 42);
     MensaCard frankSmith = new CountCard("Frank Smith", Color.gray);

uebung07/test/oop/ch05/generic/mensa/MensaTest.java

@@ -1,6 +1,8 @@
 package oop.ch05.generic.mensa;
 
-import oop.ch05.generic.secured.AuthorizationException;
+import oop.ch05.secured.AuthorizationException;
+import oop.ch05.mensa.*;
+
 import org.junit.Before;
 import org.junit.Test;