Action invoke systeem verbeterd en nette exceptions geintroduceerd.

java/src/pm/event/ApplicationEvent.java

@@ -1,9 +0,0 @@
-package pm.event;
-
-import pm.action.Action;
-
-public class ApplicationEvent extends Event {
-    public ApplicationEvent(Action action) {
-        super(action);
-    }
-}

java/src/pm/event/Event.java

@@ -2,13 +2,19 @@ package pm.event;
 
 import pm.action.Action;
 
-public abstract class Event {
+public class Event {
+    protected Type type;
     protected Action action;
 
-    public Event(Action action) {
+    public Event(Type type, Action action) {
+        this.type = type;
         this.action = action;
     }
-    
+
+    public Type getType() {
+        return type;
+    }
+
     public Action getAction() {
         return action;
     }

java/src/pm/event/Type.java

@@ -0,0 +1,5 @@
+package pm.event;
+
+public enum Type {
+    MAIN, APPLICATION;
+}