Added DeleteGroupEvent and GroupDoesNotExistException

src/main/java/mops/gruppen2/controller/Gruppen2Controller.java

@@ -29,7 +29,8 @@ public class Gruppen2Controller {
         this.groupService = groupService;
     }
 
-    /**Zeigt die index.html an.
+    /**
+     * Zeigt die index.html an.
      *
      * @param token toller token
      * @param model tolles model

src/main/java/mops/gruppen2/domain/Aggregate.java

@@ -30,8 +30,7 @@ public abstract class Aggregate {
             Method method = this.getClass().getDeclaredMethod("applyEvent", event.getClass());
             method.setAccessible(true);
             method.invoke(this, event);
-        }
-        catch (IllegalAccessException e) {
+        } catch (IllegalAccessException e) {
             e.printStackTrace();
         } catch (NoSuchMethodException e) {
             e.printStackTrace();

src/main/java/mops/gruppen2/domain/Exceptions/GroupDoesNotExistException.java

@@ -0,0 +1,9 @@
+package mops.gruppen2.domain.Exceptions;
+
+import mops.gruppen2.domain.event.Event;
+
+public class GroupDoesNotExistException extends EventException {
+    public GroupDoesNotExistException(String msg) {
+        super(msg);
+    }
+}

src/main/java/mops/gruppen2/domain/Group.java

@@ -68,8 +68,8 @@ public class Group extends Aggregate {
         this.description = event.getNewGroupDescription();
     }
 
-    private void applyEvent(DeleteUserEvent event) throws UserNotFoundException{
-        User user = new User(event.getUser_id(), "","","");
+    private void applyEvent(DeleteUserEvent event) throws UserNotFoundException {
+        User user = new User(event.getUser_id(), "", "", "");
 
         if (this.members.contains(user)) {
             this.members.remove(user);
@@ -77,4 +77,8 @@ public class Group extends Aggregate {
             throw new UserNotFoundException("Nutzer wurde nicht gefunden!");
         }
     }
+
+    private void applyEvent(DeleteGroupEvent event) {
+        this.id = this.id * -1;
+    }
 }

src/main/java/mops/gruppen2/domain/event/DeleteGroupEvent.java

@@ -0,0 +1,13 @@
+package mops.gruppen2.domain.event;
+
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+
+@EqualsAndHashCode(callSuper = true)
+@Value
+public class DeleteGroupEvent extends Event {
+
+    public DeleteGroupEvent(long event_id, long group_id, String user_id) {
+        super(event_id, group_id, user_id);
+    }
+}

src/main/java/mops/gruppen2/service/GroupService.java

@@ -1,8 +1,8 @@
 package mops.gruppen2.service;
 
 import mops.gruppen2.domain.Exceptions.EventException;
+import mops.gruppen2.domain.Exceptions.GroupDoesNotExistException;
 import mops.gruppen2.domain.Group;
-import mops.gruppen2.domain.event.AddUserEvent;
 import mops.gruppen2.domain.event.CreateGroupEvent;
 import mops.gruppen2.domain.event.Event;
 import org.springframework.stereotype.Service;
@@ -18,17 +18,32 @@ public class GroupService {
      * @param eventList Die restlichen Events für diese Gruppe
      * @return Gruppe auf aktuellem Stand
      */
-    Group buildGroupFromEvents(List<Event> eventList) {
+    Group buildGroupFromEvents(List<Event> eventList) throws EventException {
         Group newGroup = new Group();
 
         try {
+            if (!(eventList.get(0) instanceof CreateGroupEvent)) {
+                throw new GroupDoesNotExistException("Die Gruppe existiert nicht");
+            } else {
+                newGroup.applyEvent(eventList.get(0));
+                eventList.remove(0);
+            }
             for (Event event : eventList) {
+                if (!(newGroup.getId() > 0)) {
+                    throw new GroupDoesNotExistException("Die Gruppe existiert nicht");
+                }
                 newGroup.applyEvent(event);
             }
-        }catch (EventException e){
+        } catch (EventException e) {
+            if (e instanceof GroupDoesNotExistException) {
+                throw e;
+            }
             e.printStackTrace();
         }
 
+        if (newGroup.getId() < 0) {
+            return null;
+        }
         return newGroup;
     }
 }