feat: move everything to single folder

cs2030s/Lab1/ArrivalEvent.java

@@ -0,0 +1,50 @@
+
+/**
+ * The ArrivalEvent is an Event which handles the arrival of a customer
+ * It decides whether a customer should go into queue or go to a counter
+ * It also allocates a counter to the customer. This event thus returns either a
+ * DepartureEvent or a ServiceBeginEvent
+ * 
+ * @author Yadunand Prem
+ * @version CS2030S AY22/23 Semester 2
+ */
+class ArrivalEvent extends Event {
+
+  private Customer customer;
+  private Shop shop;
+
+  public ArrivalEvent(Customer customer, Shop shop) {
+    super(customer.getArrivalTIme());
+    this.customer = customer;
+    this.shop = shop;
+  }
+
+  @Override
+  public Event[] simulate() {
+    ServiceCounter availableCounter = this.shop.getAvailableCounter();
+    // check if counters are available. If available, start service for that
+    // customer
+    if (availableCounter != null) {
+      return new Event[] {
+          new ServiceBeginEvent(this.getTime(), customer, shop, availableCounter) };
+    }
+    // if no counters available, check if queue slots avialable in counters
+    availableCounter = this.shop.findCounterWithQueue();
+    if (availableCounter != null) {
+      return new Event[] { 
+        new JoinCounterQueueEvent(this.getTime(), this.customer, availableCounter) 
+      };
+    }
+    // if shop queue isn't empty, join shop queue
+    if (!this.shop.isQueueFull()) {
+      return new Event[] { new JoinShopQueueEvent(customer, shop) };
+    }
+    return new Event[] { new DepartureEvent(this.getTime(), customer) };
+
+  }
+
+  @Override
+  public String toString() {
+    return String.format("%s: %s arrived %s", super.toString(), this.customer, this.shop);
+  }
+}