slight changes to package structure + naming

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

@@ -0,0 +1,69 @@
+package mops.gruppen2.domain;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import mops.gruppen2.domain.event.*;
+import mops.gruppen2.domain.event.AddUserEvent;
+import mops.gruppen2.domain.event.CreateGroupEvent;
+import mops.gruppen2.domain.event.UpdateGroupDescriptionEvent;
+import mops.gruppen2.domain.event.UpdateGroupTitleEvent;
+import mops.gruppen2.domain.event.DeleteUserEvent;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@EqualsAndHashCode(callSuper=false)
+@Data
+public class Group extends Aggregate {
+	long id;
+	String titel;
+	String beschreibung;
+	List<User> teilnehmersList;
+	Map<User, Role> rollenList;
+
+	public void applyEvent(CreateGroupEvent event){
+		this.id = event.getGruppe_id();
+		this.titel = event.getTitel();
+		this.beschreibung = event.getBeschreibung();
+		this.teilnehmersList = new ArrayList<>();
+		this.rollenList = new HashMap<>();
+	}
+
+	public void applyEvent(UpdateRoleEvent event) {
+		teilnehmersList.stream()
+				.filter(user -> user.getId().equals(event.getUser_id()))
+				.findFirst()
+				.ifPresentOrElse(user -> rollenList.put(user, event.getRole()),
+						() -> System.out.println("UserNotFoundException"));
+	}
+
+	public void  applyEvent(AddUserEvent event){
+		User user = new User();
+
+		user.setId(event.getUser_id());
+		user.setVorname(event.getVorname());
+		user.setNachname(event.getNachname());
+		user.setEmail(event.getEmail());
+
+		this.teilnehmersList.add(user);
+	}
+
+	public void applyEvent(UpdateGroupTitleEvent event) {
+		this.titel = event.getTitel();
+	}
+
+	public void applyEvent(UpdateGroupDescriptionEvent event) {
+		this.beschreibung = event.getBeschreibung();
+	}
+
+	public void applyEvent(DeleteUserEvent event) {
+		for (User user : teilnehmersList) {
+			if (user.getId().equals(event.getUser_id())) {
+				this.teilnehmersList.remove(user);
+				break;
+			}
+		}
+	}
+}