Merge branch 'master' into refactor-controller

# Conflicts:
#	src/main/java/mops/gruppen2/controller/WebController.java

README.adoc

@@ -61,5 +61,4 @@ Für *Studenten* (keycloak Rolle) :
 
 === Verwendung
 
-Wir werden ein Dockerfile bereitstellen, das heißt ihr könnt die Anwendung einfach starten.
+Die Anwendung kann mit `docker-compse up` im Wurzelverzeichnis gestartet werden, eine API-Doku befindet sich im Dokumentation-Ordner (das swagger-zip).
-Unter localhost:8081/swagger-ui.html findet ihr die API-Dokumentation.

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

@@ -1,5 +1,7 @@
 package mops.gruppen2.controller;
 
+import mops.gruppen2.domain.exception.EventException;
+import mops.gruppen2.domain.exception.PageNotFoundException;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 
@@ -17,10 +19,10 @@ public class MopsController {
     public String logout(HttpServletRequest request) throws Exception {
         request.logout();
         return "redirect:/gruppen2/";
-    }/*
+    }
 
     @GetMapping("*")
-    public String defaultLink() {
+    public String defaultLink() throws EventException {
-        return "error";
+        throw new PageNotFoundException("\uD83D\uDE41");
-    }*/
+    }
 }

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

@@ -1,14 +1,17 @@
 package mops.gruppen2.controller;
 
 import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;
-import mops.gruppen2.config.Gruppen2Config;
 import mops.gruppen2.domain.Group;
 import mops.gruppen2.domain.Role;
 import mops.gruppen2.domain.User;
 import mops.gruppen2.domain.Visibility;
 import mops.gruppen2.domain.exception.EventException;
+import mops.gruppen2.domain.exception.GroupFullException;
 import mops.gruppen2.domain.exception.GroupNotFoundException;
+import mops.gruppen2.domain.exception.NoAccessException;
 import mops.gruppen2.domain.exception.NoAdminAfterActionException;
+import mops.gruppen2.domain.exception.PageNotFoundException;
+import mops.gruppen2.domain.exception.UserAlreadyExistsException;
 import mops.gruppen2.domain.exception.WrongFileException;
 import mops.gruppen2.security.Account;
 import mops.gruppen2.service.ControllerService;
@@ -26,7 +29,9 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.context.annotation.SessionScope;
 import org.springframework.web.multipart.MultipartFile;
+
 import javax.annotation.security.RolesAllowed;
+import javax.servlet.http.HttpServletRequest;
 import java.io.CharConversionException;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -147,6 +152,47 @@ public class WebController {
         return "redirect:/gruppen2/details/members/" + groupId;
     }
 
+    @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator"})
+    @GetMapping("/details/changeMetadata/{id}")
+    public String changeMetadata(KeycloakAuthenticationToken token, Model model, @PathVariable("id") String groupId) {
+        Account account = keyCloakService.createAccountFromPrincipal(token);
+        User user = new User(account.getName(), account.getGivenname(), account.getFamilyname(), account.getEmail());
+        Group group = userService.getGroupById(UUID.fromString(groupId));
+        model.addAttribute("account", account);
+        UUID parentId = group.getParent();
+        Group parent = new Group();
+        if (!group.getMembers().contains(user)) {
+            if (group.getVisibility() == Visibility.PRIVATE) {
+                return "privateGroupNoMember";
+            }
+            model.addAttribute("group", group);
+            model.addAttribute("parentId", parentId);
+            model.addAttribute("parent", parent);
+            return "detailsNoMember";
+        }
+        model.addAttribute("title", group.getTitle());
+        model.addAttribute("description", group.getDescription());
+        model.addAttribute("admin", Role.ADMIN);
+        model.addAttribute("roles", group.getRoles());
+        model.addAttribute("groupId", group.getId());
+        model.addAttribute("user", user);
+        return "changeMetadata";
+    }
+
+    @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator"})
+    @PostMapping("/details/changeMetadata")
+    public String pChangeMetadata(KeycloakAuthenticationToken token,
+                                  @RequestParam("title") String title,
+                                  @RequestParam("description") String description,
+                                  @RequestParam("groupId") String groupId) throws EventException {
+
+        Account account = keyCloakService.createAccountFromPrincipal(token);
+        controllerService.updateTitle(account, UUID.fromString(groupId), title);
+        controllerService.updateDescription(account, UUID.fromString(groupId), description);
+
+        return "redirect:/gruppen2/details/" + groupId;
+    }
+
     @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator"})
     @GetMapping("/findGroup")
     public String findGroup(KeycloakAuthenticationToken token,
@@ -164,9 +210,7 @@ public class WebController {
 
     @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator)"})
     @GetMapping("/details/{id}")
-    public String showGroupDetails(KeycloakAuthenticationToken token,
+    public String showGroupDetails(KeycloakAuthenticationToken token, Model model, HttpServletRequest request, @PathVariable("id") String groupId) throws EventException {
-                                   Model model,
-                                   @PathVariable("id") String groupId) throws EventException {
         model.addAttribute("account", keyCloakService.createAccountFromPrincipal(token));
 
         Group group = userService.getGroupById(UUID.fromString(groupId));
@@ -177,7 +221,7 @@ public class WebController {
         Group parent = new Group();
 
         if (group.getTitle() == null) {
-            throw new GroupNotFoundException(this.getClass().toString());
+            throw new GroupNotFoundException("@details");
         }
 
         if (!group.getMembers().contains(user)) {
@@ -200,6 +244,12 @@ public class WebController {
         model.addAttribute("roles", group.getRoles());
         model.addAttribute("user", user);
         model.addAttribute("admin", Role.ADMIN);
+
+        String URL = request.getRequestURL().toString();
+        String serverURL = URL.substring(0, URL.indexOf("gruppen2/"));
+
+        model.addAttribute("link", serverURL + "gruppen2/acceptinvite/" + groupId);
+
         return "detailsMember";
     }
 
@@ -212,12 +262,13 @@ public class WebController {
         User user = new User(account.getName(), account.getGivenname(), account.getFamilyname(), account.getEmail());
         Group group = userService.getGroupById(UUID.fromString(groupId));
         if (group.getMembers().contains(user)) {
-            return "redirect:/gruppen2/details/" + groupId; //TODO: hier soll eigentlich auf die bereits beigetretene Gruppe weitergeleitet werden
+            throw new UserAlreadyExistsException("Du bist bereits in dieser Gruppe.");
-        }
-        if (group.getUserMaximum() < group.getMembers().size()) {
-            return "error";
         }
         controllerService.addUser(account, UUID.fromString(groupId));
+        if (group.getUserMaximum() < group.getMembers().size()) {
+            throw new GroupFullException("Du kannst der Gruppe daher leider nicht beitreten.");
+        }
+        //controllerService.addUser(account, groupId);
         return "redirect:/gruppen2/";
     }
 
@@ -230,9 +281,11 @@ public class WebController {
         Group group = userService.getGroupById(UUID.fromString(groupId));
         UUID parentId = group.getParent();
         Group parent = new Group();
-        if (parentId != null) {
+
+        if (!controllerService.idIsEmpty(parentId)) {
             parent = userService.getGroupById(parentId);
         }
+
         if (group.getUserMaximum() > group.getMembers().size()) {
             model.addAttribute("group", group);
             model.addAttribute("parentId", parentId);
@@ -240,11 +293,11 @@ public class WebController {
 
             return "detailsNoMember";
         }
-        throw new GroupNotFoundException(this.getClass().toString());
+        throw new GroupNotFoundException("@search");
     }
 
     @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator"})
-    @GetMapping("/acceptinvite/{link}")
+    @GetMapping("/acceptinvite/{groupId}")
     public String acceptInvite(KeycloakAuthenticationToken token,
                                Model model, @PathVariable String groupId) throws EventException {
         model.addAttribute("account", keyCloakService.createAccountFromPrincipal(token));
@@ -253,7 +306,7 @@ public class WebController {
             model.addAttribute("group", group);
             return "redirect:/gruppen2/detailsSearch?id=" + group.getId();
         }
-        throw new GroupNotFoundException(this.getClass().toString());
+        throw new GroupNotFoundException("@accept");
     }
 
     @RolesAllowed({"ROLE_orga", "ROLE_studentin", "ROLE_actuator"})
@@ -280,7 +333,7 @@ public class WebController {
         User user = new User(account.getName(), account.getGivenname(), account.getFamilyname(), account.getEmail());
         Group group = userService.getGroupById(UUID.fromString(groupId));
         if (group.getRoles().get(user.getId()) != Role.ADMIN) {
-            return "error";
+            throw new NoAccessException("");
         }
         controllerService.deleteGroupEvent(user.getId(), UUID.fromString(groupId));
         return "redirect:/gruppen2/";
@@ -346,4 +399,9 @@ public class WebController {
         }
         return "redirect:/gruppen2/details/members/" + groupId;
     }
+
+    @GetMapping("*")
+    public String defaultLink() throws EventException {
+        throw new PageNotFoundException("\uD83D\uDE41");
+    }
 }

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

@@ -32,14 +32,14 @@ public class AddUserEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws EventException {
+    protected void applyEvent(Group group) throws EventException {
         User user = new User(this.userId, this.givenname, this.familyname, this.email);
 
         if (group.getMembers().contains(user)) {
             throw new UserAlreadyExistsException(this.getClass().toString());
         }
 
-        if (group.getMembers().size() == group.getUserMaximum()){
+        if (group.getMembers().size() == group.getUserMaximum()) {
             throw new GroupFullException(this.getClass().toString());
         }
 

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

@@ -28,7 +28,7 @@ public class CreateGroupEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         group.setId(this.groupId);
         group.setParent(this.groupParent);
         group.setType(this.groupType);

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

@@ -15,7 +15,7 @@ public class DeleteGroupEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         group.getRoles().clear();
         group.getMembers().clear();
         group.setTitle(null);

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

@@ -21,7 +21,7 @@ public class DeleteUserEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws EventException {
+    protected void applyEvent(Group group) throws EventException {
         for (User user : group.getMembers()) {
             if (user.getId().equals(this.userId)) {
                 group.getMembers().remove(user);

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

@@ -24,7 +24,7 @@ public class UpdateGroupDescriptionEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         if (this.newGroupDescription.isEmpty()) {
             throw new NoValueException(this.getClass().toString());
         }

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

@@ -24,7 +24,7 @@ public class UpdateGroupTitleEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         if (this.getNewGroupTitle().isEmpty()) {
             throw new NoValueException(this.getClass().toString());
         }

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

@@ -25,7 +25,7 @@ public class UpdateRoleEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws UserNotFoundException {
+    protected void applyEvent(Group group) throws UserNotFoundException {
         if (group.getRoles().containsKey(this.userId)) {
             group.getRoles().put(this.userId, this.newRole);
             return;

src/main/java/mops/gruppen2/domain/exception/GroupFullException.java

@@ -5,7 +5,7 @@ import org.springframework.http.HttpStatus;
 public class GroupFullException extends EventException {
 
 	public GroupFullException(String info) {
-		super(HttpStatus.INTERNAL_SERVER_ERROR, "Der User existiert bereits.", info);
+		super(HttpStatus.INTERNAL_SERVER_ERROR, "Die Gruppe hat die maximale Midgliederanzahl bereits erreicht!", info);
 	}
 }
 

src/main/java/mops/gruppen2/domain/exception/NoAccessException.java

@@ -0,0 +1,10 @@
+package mops.gruppen2.domain.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class NoAccessException extends EventException {
+
+    public NoAccessException(String info) {
+        super(HttpStatus.FORBIDDEN, "Hier hast du leider keinen Zugriff!", info);
+    }
+}

src/main/java/mops/gruppen2/domain/exception/PageNotFoundException.java

@@ -0,0 +1,10 @@
+package mops.gruppen2.domain.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class PageNotFoundException extends EventException {
+
+    public PageNotFoundException(String info) {
+        super(HttpStatus.NOT_FOUND, "Die Seite wurde nicht gefunden!", info);
+    }
+}

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

@@ -0,0 +1,8 @@
+package mops.gruppen2.service;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class SearchService {
+
+}

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

@@ -5,7 +5,6 @@ import mops.gruppen2.domain.User;
 import mops.gruppen2.domain.event.Event;
 import mops.gruppen2.domain.exception.EventException;
 import mops.gruppen2.domain.exception.GroupNotFoundException;
-import mops.gruppen2.repository.EventRepository;
 import org.springframework.stereotype.Service;
 
 import java.util.ArrayList;
@@ -47,7 +46,7 @@ public class UserService {
             List<Event> events = groupService.getGroupEvents(groupIds);
             return groupService.projectEventList(events).get(0);
         } catch (IndexOutOfBoundsException e) {
-            throw new GroupNotFoundException(this.getClass().toString());
+            throw new GroupNotFoundException("@UserService");
         }
     }
 }

src/main/resources/application-dev.properties

@@ -18,3 +18,4 @@ keycloak.use-resource-role-mappings=true
 keycloak.autodetect-bearer-only=true
 keycloak.confidential-port=443
 server.error.include-stacktrace=always
+server.port=8080

src/main/resources/templates/changeMetadata.html

@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html lang="en"
+      th:replace="~{mopslayout :: html(name='Gruppenbildung', headcontent=~{:: headcontent}, navigation=~{:: navigation}, bodycontent=~{:: bodycontent})}"
+      xmlns="http://www.w3.org/1999/html"
+      xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="utf-8">
+    <title>Gruppenerstellung</title>
+    <th:block th:fragment="headcontent">
+        <!-- Links, Skripts, Styles hier einfügen! -->
+        <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
+              rel="stylesheet">
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
+        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
+    </th:block>
+</head>
+<body>
+<header>
+    <nav class="navigation navigation-secondary" is="mops-navigation" th:fragment="navigation"
+         th:switch="${account.getRoles().contains('orga')}">
+        <ul>
+            <li class="active">
+                <a href="/" th:href="@{/gruppen2}">Gruppen</a>
+            </li>
+            <li th:case="${true}">
+                <a href="/createOrga" th:href="@{/gruppen2/createOrga}">Erstellen</a>
+            </li>
+            <li th:case="${false}">
+                <a href="/createStudent" th:href="@{/gruppen2/createStudent}">Erstellen</a>
+            </li>
+            <li>
+                <a href="/findGroup" th:href="@{/gruppen2/findGroup}">Suche</a>
+            </li>
+        </ul>
+    </nav>
+</header>
+<main th:fragment="bodycontent">
+    <div class="container-fluid">
+        <div class="row">
+            <div class="col-10">
+                <h1>Metadaten ändern</h1>
+                <form action="/gruppen2/details/changeMetadata" method="post">
+                    <div class="shadow-sm p-2"
+                         style=" border: 10px solid aliceblue; background: aliceblue">
+                        <div class="form-group">
+                            <label for="title">Titel</label>
+                            <input class="form-control" id="title" required
+                                   th:name="title" th:value="${title}" type="text">
+                        </div>
+                        <div class="form-group">
+                            <label for="description">Beschreibung</label>
+                            <textarea class="form-control" id="description" required rows="3"
+                                      th:name="description"
+                                      th:text="${description}"></textarea>
+                        </div>
+                        <div class="form-group pt-4">
+                            <button class="btn btn-primary"
+                                    style="background: #52a1eb; border-style: none"
+                                    th:if="${roles.get(user.getId()) == admin}"
+                                    th:name="groupId"
+                                    th:value="${groupId}"
+                                    type="submit">Speichern
+                            </button>
+                        </div>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+</main>
+</body>
+</html>

src/main/resources/templates/detailsMember.html

@@ -6,7 +6,8 @@
     <meta charset="utf-8">
     <title>Gruppendetails</title>
     <th:block th:fragment="headcontent">
-        <!-- Links, Skripts, Styles hier einfügen! -->
+        <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"
+              rel="stylesheet">
     </th:block>
 </head>
 <body>
@@ -31,8 +32,16 @@
 <main th:fragment="bodycontent">
     <div class="container-fluid">
         <div>
-            <div class="shadow-sm p-4 col-8" style="border: 10px solid aliceblue; display: inline-block; border-radius: 5px; background: aliceblue">
+            <div class="shadow-sm p-4 col-8"
-                <h1 style="color: black; font-weight: bold; font-optical-sizing: auto; overflow-wrap: break-word" th:text="${group.getTitle()}"></h1>
+                 style="border: 10px solid aliceblue; display: inline-block; border-radius: 5px; background: aliceblue">
+                <div class="row">
+                    <h1 style="color: black; font-weight: bold; font-optical-sizing: auto; overflow-wrap: break-word; width: 95%"
+                        th:text="${group.getTitle()}"></h1>
+                    <a class="fa fa-pencil"
+                       style="font-size:30px; width: 5%"
+                       th:href="@{/gruppen2/details/changeMetadata/{id}(id=${group.getId()})}"
+                       th:if="${roles.get(user.getId()) == admin}"></a>
+                </div>
                 <h3>
                     <span class="badge badge-pill badge-dark" style="background: darkslategray"
                           th:if='${group.getVisibility() == group.getVisibility().PRIVATE }'>Private Gruppe</span>
@@ -42,6 +51,23 @@
                           th:if='${group.getType() == group.getType().LECTURE}'>Veranstaltung</span>
                     <span class="badge badge-pill badge-info" style="background: mediumorchid"
                           th:text="${parent.getTitle()}">Parent</span>
+
+                    <div class="input-group mb-3" style="margin-top: 10px"
+                         th:if="${group.getVisibility() == group.getVisibility().PRIVATE}">
+                        <div class="input-group-prepend">
+                            <span class="input-group-text" id="inputGroup-sizing-default"
+                                  style="background: #52a1eb">Einladungslink:</span>
+                        </div>
+                        <input aria-describedby="basic-addon2" aria-label="Recipient's username"
+                               class="form-control"
+                               id="groupLink" readonly style="background: white" th:value="${link}"
+                               type="text">
+                        <div class="input-group-append">
+                            <button class="btn btn-outline-secondary" onclick="copyLink()"
+                                    type="button">Link kopieren
+                            </button>
+                        </div>
+                    </div>
                 </h3>
                 <br>
                 <div class="shadow-sm p-4" style="background: white">
@@ -100,6 +126,16 @@
             </div>
         </div>
     </div>
+    <script>
+        function copyLink() {
+            var copyText = document.getElementById("groupLink");
+
+            copyText.select();
+            copyText.setSelectionRange(0, 99999);
+
+            document.execCommand("copy");
+        }
+    </script>
 </main>
 </body>
 </html>

src/main/resources/templates/error.html

@@ -27,8 +27,10 @@
             </div>
         </div>
 
-        <button style="color: #52a1eb">
+        <button class="btn btn-primary"
-            <a  style="color: white" class="btn btn-primary btn-lg" href="#" onclick="window.history.back(-1);return false;" role="button">Zurück</a>
+                style="background: #52a1eb; border-style: none;">
+            <a href="#" onclick="window.history.back(-1);return false;" role="button"
+               style="color: white">Zurück</a>
         </button>
     </div>
 </div>

src/main/resources/templates/search.html

@@ -56,8 +56,8 @@
                         <th scope="col">Mitgliederanzahl</th>
                     </tr>
                     </thead>
-                    <tbody th:each="gruppe : ${gruppen}">
+                    <tbody>
-                    <tr>
+                    <tr th:each="gruppe : ${gruppen}">
                         <th scope="row">
                             <a th:href="@{/gruppen2/detailsSearch(id=${gruppe.getId()})}"
                                th:text="${gruppe.title}">Gruppenname</a>

src/test/java/mops/gruppen2/TestBuilder.java

@@ -0,0 +1,201 @@
+package mops.gruppen2;
+
+import com.github.javafaker.Faker;
+import mops.gruppen2.domain.Group;
+import mops.gruppen2.domain.GroupType;
+import mops.gruppen2.domain.Role;
+import mops.gruppen2.domain.Visibility;
+import mops.gruppen2.domain.event.AddUserEvent;
+import mops.gruppen2.domain.event.CreateGroupEvent;
+import mops.gruppen2.domain.event.DeleteUserEvent;
+import mops.gruppen2.domain.event.Event;
+import mops.gruppen2.domain.event.UpdateGroupDescriptionEvent;
+import mops.gruppen2.domain.event.UpdateGroupTitleEvent;
+import mops.gruppen2.domain.event.UpdateRoleEvent;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class TestBuilder {
+
+    private static final Faker faker = new Faker();
+
+    /**
+     * Generiert ein EventLog mit mehreren Gruppen und Usern.
+     *
+     * @param count       Gruppenanzahl
+     * @param membercount Gesamte Mitgliederanzahl
+     * @return Eventliste
+     */
+    public static List<Event> completeGroups(int count, int membercount) {
+        int memPerGroup = membercount / count;
+
+        return IntStream.rangeClosed(0, count)
+                        .parallel()
+                        .mapToObj(i -> completeGroup(memPerGroup))
+                        .flatMap(Collection::stream)
+                        .collect(Collectors.toList());
+    }
+
+    public static List<Event> completeGroup(int membercount) {
+        List<Event> eventList = new ArrayList<>();
+        UUID groupId = UUID.randomUUID();
+
+        eventList.add(createGroupEvent(groupId));
+        eventList.add(updateGroupTitleEvent(groupId));
+        eventList.add(updateGroupDescriptionEvent(groupId));
+        eventList.addAll(addUserEvents(membercount, groupId));
+
+        return eventList;
+    }
+
+    public static List<Event> completeGroup() {
+        return completeGroup(100);
+    }
+
+    /**
+     * Generiert mehrere CreateGroupEvents, 1 <= groupId <= count.
+     *
+     * @param count Anzahl der verschiedenen Gruppen
+     * @return Eventliste
+     */
+    public static List<CreateGroupEvent> createGroupEvents(int count) {
+        return IntStream.rangeClosed(0, count)
+                        .parallel()
+                        .mapToObj(i -> createGroupEvent())
+                        .collect(Collectors.toList());
+    }
+
+    public static CreateGroupEvent createGroupEvent(UUID groupId) {
+        return new CreateGroupEvent(
+                groupId,
+                faker.random().hex(),
+                null,
+                GroupType.SIMPLE,
+                Visibility.PUBLIC,
+                10000000L
+        );
+    }
+
+    public static CreateGroupEvent createGroupEvent() {
+        return createGroupEvent(UUID.randomUUID());
+    }
+
+    /**
+     * Generiert mehrere AddUserEvents für eine Gruppe, 1 <= user_id <= count.
+     *
+     * @param count   Anzahl der Mitglieder
+     * @param groupId Gruppe, zu welcher geaddet wird
+     * @return Eventliste
+     */
+    public static List<Event> addUserEvents(int count, UUID groupId) {
+        return IntStream.rangeClosed(1, count)
+                        .parallel()
+                        .mapToObj(i -> addUserEvent(groupId, String.valueOf(i)))
+                        .collect(Collectors.toList());
+    }
+
+    public static AddUserEvent addUserEvent(UUID groupId, String userId) {
+        String firstname = firstname();
+        String lastname = lastname();
+
+        return new AddUserEvent(
+                groupId,
+                userId,
+                firstname,
+                lastname,
+                firstname + "." + lastname + "@mail.de"
+        );
+    }
+
+    public static AddUserEvent addUserEvent(UUID groupId) {
+        return addUserEvent(groupId, faker.random().hex());
+    }
+
+    public static List<Event> deleteUserEvents(int count, List<Event> eventList) {
+        List<Event> removeEvents = new ArrayList<>();
+        List<Event> shuffle = eventList.parallelStream()
+                                       .filter(event -> event instanceof AddUserEvent)
+                                       .collect(Collectors.toList());
+
+        Collections.shuffle(shuffle);
+
+        for (Event event : shuffle) {
+            removeEvents.add(new DeleteUserEvent(event.getGroupId(), event.getUserId()));
+
+            if (removeEvents.size() >= count) {
+                break;
+            }
+        }
+
+        return removeEvents;
+    }
+
+    /**
+     * Erzeugt mehrere DeleteUserEvents, sodass eine Gruppe komplett geleert wird.
+     *
+     * @param group Gruppe welche geleert wird
+     * @return Eventliste
+     */
+    public static List<DeleteUserEvent> deleteUserEvents(Group group) {
+        return group.getMembers().parallelStream()
+                    .map(user -> deleteUserEvent(group.getId(), user.getId()))
+                    .collect(Collectors.toList());
+    }
+
+    public static DeleteUserEvent deleteUserEvent(UUID groupId, String userId) {
+        return new DeleteUserEvent(
+                groupId,
+                userId
+        );
+    }
+
+    public static UpdateGroupDescriptionEvent updateGroupDescriptionEvent(UUID groupId) {
+        return new UpdateGroupDescriptionEvent(
+                groupId,
+                faker.random().hex(),
+                quote()
+        );
+    }
+
+    public static UpdateGroupTitleEvent updateGroupTitleEvent(UUID groupId) {
+        return new UpdateGroupTitleEvent(
+                groupId,
+                faker.random().hex(),
+                champion()
+        );
+    }
+
+    public static UpdateRoleEvent randomUpdateRoleEvent(UUID groupId, String userId, Role role) {
+        return new UpdateRoleEvent(
+                groupId,
+                userId,
+                role
+        );
+    }
+
+    private static String firstname() {
+        return clean(faker.name().firstName());
+    }
+
+    private static String lastname() {
+        return clean(faker.name().lastName());
+    }
+
+    private static String champion() {
+        return clean(faker.leagueOfLegends().champion());
+    }
+
+    private static String quote() {
+        return clean(faker.leagueOfLegends().quote());
+    }
+
+    private static String clean(String string) {
+        return string.replaceAll("['\";,]", "");
+    }
+}