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NitroxModel/DataStructures/GameLogic/Entities/PrefabChildEntity.cs

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+using System;
+using NitroxModel.DataStructures.GameLogic.Entities.Metadata;
+using System.Collections.Generic;
+using System.Runtime.Serialization;
+using BinaryPack.Attributes;
+
+namespace NitroxModel.DataStructures.GameLogic.Entities
+{
+    /*
+     * A PrefabChildEntity is a gameobject that resides inside of a spawned prefab.  Although the server knows about these,
+     * it is too cost prohibitive for it to send spawn data for all of these.  Instead, we let the game spawn them and tag
+     * the entity after the fact.  An example of this is a keypad in the aurora; there is an overarching Door prefab with 
+     * the keypad baked in - we simply update the id of the keypad on spawn.  Each PrefabChildEntity will always bubble up
+     * to a root WorldEntity.
+     */
+    [Serializable]
+    [DataContract]
+    public class PrefabChildEntity : Entity
+    {       
+        [DataMember(Order = 1)]
+        public int ComponentIndex { get; set; }
+
+        [DataMember(Order = 2)]
+        public string ClassId { get; set; }
+
+        [IgnoreConstructor]
+        protected PrefabChildEntity()
+        {
+            // Constructor for serialization. Has to be "protected" for json serialization.
+        }
+
+        public PrefabChildEntity(NitroxId id, string classId, NitroxTechType techType, int componentIndex, EntityMetadata metadata, NitroxId parentId)
+        {
+            Id = id;
+            TechType = techType;
+            ComponentIndex = componentIndex;
+            ParentId = parentId;
+            ClassId = classId;
+            Metadata = metadata;
+        }
+
+        /// <remarks>Used for deserialization</remarks>
+        public PrefabChildEntity(int componentIndex, string classId, NitroxId id, NitroxTechType techType, EntityMetadata metadata, NitroxId parentId, List<Entity> childEntities)
+        {
+            ComponentIndex = componentIndex;
+            ClassId = classId;
+            Id = id;
+            TechType = techType;
+            Metadata = metadata;
+            ParentId = parentId;
+            ChildEntities = childEntities;
+        }
+
+        public override string ToString()
+        {
+            return $"[PrefabChildEntity ComponentIndex: {ComponentIndex} ClassId: {ClassId} {base.ToString()}]";
+        }
+    }
+}