Add Factory for Transaction

src/main/java/Model/Exchange.java

@@ -66,8 +66,8 @@ public Transaction buy(String symbol, BigDecimal quantity, Player player) {
         // lager en ny "andel" basert på nåværende salgspris
         Share shareToBuy = new Share(stock, quantity, stock.getSalesPrice());
 
-        // oppretter kjøpstransaksjonen for den uka
-        Purchase purchase = new Purchase(shareToBuy, this.week);
+        // oppretter kjøpstransaksjonen for den uka via fabrikken
+        Transaction purchase = TransactionFactory.createPurchase(shareToBuy, this.week);
 
         // committer til player
         purchase.commit(player);
@@ -81,8 +81,8 @@ public Transaction sell(Share share, Player player) {
             return null;
         }
 
-        // oppretter salgstransaksjonen for den uka
-        Sale sale = new Sale(share, this.week);
+        // oppretter salgstransaksjonen for den uka via fabrikken
+        Transaction sale = TransactionFactory.createSale(share, this.week);
 
         // commiter til player
         sale.commit(player);

src/main/java/Model/TransactionFactory.java

@@ -0,0 +1,22 @@
+package Model;
+
+/**
+ * Factory for creating transaction objects
+ */
+public class TransactionFactory {
+
+    /**
+     * Create purchase transaction
+     */
+    public static Transaction createPurchase(Share share, int week) {
+        return new Purchase(share, week);
+    }
+
+    /**
+     * Create sale transaction
+     */
+    public static Transaction createSale(Share share, int week) {
+        return new Sale(share, week);
+    }
+
+}