1 files changed, 31 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Services/EntityException.cs b/BackEnd/Timeline/Services/EntityException.cs
new file mode 100644
index 00000000..7a302e5a
--- /dev/null
+++ b/BackEnd/Timeline/Services/EntityException.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Timeline.Services
+{
+    [Serializable]
+    public class EntityException : Exception
+    {
+        public EntityException() { }
+        public EntityException(string? message) : base(message) { }
+        public EntityException(string? message, Exception? inner) : base(message, inner) { }
+        public EntityException(EntityType entityType, IDictionary<string, object> constraints, string? message = null, Exception? inner = null)
+            : base(message, inner)
+        {
+            EntityType = entityType;
+            Constraints = constraints;
+        }
+        protected EntityException(
+          System.Runtime.Serialization.SerializationInfo info,
+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+
+        public EntityType EntityType { get; } = EntityTypes.Default;
+        public IDictionary<string, object> Constraints { get; } = new Dictionary<string, object>();
+
+        public string GenerateConstraintString()
+        {
+            return string.Join(' ', Constraints.Select(c => $"[{c.Key} = {c.Value}]"));
+        }
+    }
+}