public boolean hasGroupAnnotation() {
   for (Data note : this.notes) {
     if (note.isGroup()) {
       return true;
     }
   }
   return false;
 }
 public String getGroupNoteContent() {
   for (Data note : this.notes) {
     if (note.isGroup()) {
       return note.getText();
     }
   }
   return "";
 }