@Override
 public ActionResponseDTO<Classpage> createClasspage(
     Classpage classpage, boolean addToUserClasspage, String assignmentId) throws Exception {
   Errors errors = validateClasspage(classpage);
   if (!errors.hasErrors()) {
     this.getCollectionRepository().save(classpage);
     if (assignmentId != null && !assignmentId.isEmpty()) {
       CollectionItem collectionItem = new CollectionItem();
       collectionItem.setItemType(ShelfType.AddedType.ADDED.getAddedType());
       collectionItem =
           this.createClasspageItem(
                   assignmentId,
                   classpage.getGooruOid(),
                   collectionItem,
                   classpage.getUser(),
                   CollectionType.CLASSPAGE.getCollectionType())
               .getModel();
       Set<CollectionItem> collectionItems = new TreeSet<CollectionItem>();
       collectionItems.add(collectionItem);
       classpage.setCollectionItems(collectionItems);
     }
     if (addToUserClasspage) {
       CollectionItem collectionItem = new CollectionItem();
       collectionItem.setItemType(ShelfType.AddedType.ADDED.getAddedType());
       this.createClasspageItem(
           classpage.getGooruOid(),
           null,
           collectionItem,
           classpage.getUser(),
           CollectionType.USER_CLASSPAGE.getCollectionType());
     }
     this.getCollectionRepository().save(classpage);
   }
   return new ActionResponseDTO<Classpage>(classpage, errors);
 }
 @Override
 public ActionResponseDTO<Classpage> createClasspage(
     Classpage newClasspage, CollectionItem newCollectionItem, String gooruOid, User user)
     throws Exception {
   Errors errors = validateClasspage(newClasspage);
   if (!errors.hasErrors()) {
     this.getCollectionRepository().save(newClasspage);
     this.getUserGroupService()
         .createGroup(
             newClasspage.getTitle(), newClasspage.getClasspageCode(), "System", user, null);
     if (gooruOid != null && !gooruOid.isEmpty() && newCollectionItem != null) {
       CollectionItem collectionItem = new CollectionItem();
       collectionItem.setItemType(ShelfType.AddedType.ADDED.getAddedType());
       collectionItem.setPlannedEndDate(newCollectionItem.getPlannedEndDate());
       collectionItem.setNarration(newCollectionItem.getNarration());
       collectionItem =
           this.createCollectionItem(
                   gooruOid,
                   newClasspage.getGooruOid(),
                   collectionItem,
                   newClasspage.getUser(),
                   CollectionType.COLLECTION.getCollectionType(),
                   false)
               .getModel();
       Set<CollectionItem> collectionItems = new TreeSet<CollectionItem>();
       collectionItems.add(collectionItem);
       newClasspage.setCollectionItems(collectionItems);
       this.getCollectionRepository().save(newClasspage);
     }
   }
   return new ActionResponseDTO<Classpage>(newClasspage, errors);
 }
  @Override
  public ActionResponseDTO<CollectionItem> createClasspageItem(
      String assignmentGooruOid,
      String classpageGooruOid,
      CollectionItem collectionItem,
      User user,
      String type)
      throws Exception {
    Classpage classpage = null;
    if (type != null && type.equalsIgnoreCase(CollectionType.USER_CLASSPAGE.getCollectionType())) {
      if (classpageGooruOid != null) {
        classpage = this.getClasspage(classpageGooruOid, null, null);
      } else {
        classpage =
            this.getCollectionRepository()
                .getUserShelfByClasspageGooruUid(
                    user.getGooruUId(), CollectionType.USER_CLASSPAGE.getCollectionType());
      }
      if (classpage == null) {
        classpage = new Classpage();
        classpage.setTitle(MY_CLASSPAGE);
        classpage.setCollectionType(CollectionType.USER_CLASSPAGE.getCollectionType());
        classpage.setClasspageCode(BaseUtil.base48Encode(7));
        classpage.setGooruOid(UUID.randomUUID().toString());
        ContentType contentType =
            (ContentType)
                this.getCollectionRepository().get(ContentType.class, ContentType.RESOURCE);
        classpage.setContentType(contentType);
        ResourceType resourceType =
            (ResourceType)
                this.getCollectionRepository()
                    .get(ResourceType.class, ResourceType.Type.CLASSPAGE.getType());
        classpage.setResourceType(resourceType);
        classpage.setLastModified(new Date(System.currentTimeMillis()));
        classpage.setCreatedOn(new Date(System.currentTimeMillis()));
        classpage.setSharing(Sharing.PRIVATE.getSharing());
        classpage.setUser(user);
        classpage.setOrganization(user.getPrimaryOrganization());
        classpage.setCreator(user);
        classpage.setDistinguish(Short.valueOf(ZERO));
        classpage.setRecordSource(NOT_ADDED);
        classpage.setIsFeatured(0);
        this.getCollectionRepository().save(classpage);
      }
      collectionItem.setItemType(ShelfType.AddedType.SUBSCRIBED.getAddedType());
    } else {
      classpage = this.getClasspage(classpageGooruOid, null, null);
      collectionItem.setItemType(ShelfType.AddedType.ADDED.getAddedType());
    }

    Collection collection =
        this.getCollectionRepository()
            .getCollectionByGooruOid(assignmentGooruOid, classpage.getUser().getGooruUId());
    Errors errors = validateClasspageItem(classpage, collection, collectionItem);
    if (collection != null) {
      if (!errors.hasErrors()) {
        collectionItem.setCollection(classpage);
        collectionItem.setResource(collection);
        int sequence =
            collectionItem.getCollection().getCollectionItems() != null
                ? collectionItem.getCollection().getCollectionItems().size() + 1
                : 1;
        collectionItem.setItemSequence(sequence);
        this.getCollectionRepository().save(collectionItem);
      }
    } else {
      throw new Exception("invalid assignmentId -" + assignmentGooruOid);
    }

    return new ActionResponseDTO<CollectionItem>(collectionItem, errors);
  }