Refactored

dotnet/AipsCore/Domain/Models/Whiteboard/Validation/WhiteboardErrors.cs

@@ -7,6 +7,38 @@ namespace AipsCore.Domain.Models.Whiteboard.Validation;
 
 public class WhiteboardErrors : AbstractErrors<Whiteboard, WhiteboardId>
 {
+    public static ValidationError NotFound(WhiteboardCode whiteboardCode)
+    {
+        const string code = "not_found";
+        string message = $"Whiteboard with code '{whiteboardCode.CodeValue}' was not found!";
+        
+        return CreateValidationError(code,message);
+    }
+    
+    public static ValidationError CannotJoin(WhiteboardCode whiteboardCode)
+    {
+        const string code = "cannot_join_whiteboard";
+        string message = $"Cannot join the whiteboard with code '{whiteboardCode.CodeValue}'";
+        
+        return CreateValidationError(code,message);
+    }
+    
+    public static ValidationError UserBanned(UserId userId)
+    {
+        const string code = "user_banned_from_whiteboard";
+        string message = $"User with id '{userId}' is banned from this whiteboard.";
+        
+        return CreateValidationError(code,message);
+    }
+    
+    public static ValidationError UserAlreadyTryingToJoin(UserId userId)
+    {
+        const string code = "user_already_trying_to_join_whiteboard";
+        string message = $"User with id '{userId}' is already trying to join the whiteboard.";
+        
+        return CreateValidationError(code,message);
+    }
+    
     public static ValidationError UserAlreadyAdded(UserId userId)
     {
         string code = "user_already_added";