feat: instantiation support (#62)

Co-authored-by: marcellsimo <83577850+sima995@users.noreply.github.com>

Author: Thundernerd

Runtime/Extensions.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using UnityEngine;
 
 namespace TNRD
 {
@@ -58,5 +59,61 @@ public static SerializableInterface<T>[] ToSerializableInterfaceArray<T>(this IE
         {
             return list.Select(e => new SerializableInterface<T>(e)).ToArray();
         }
+
+        public static TInterface Instantiate<TInterface>(this SerializableInterface<TInterface> serializableInterface) where TInterface : class
+        {
+            if (!serializableInterface.TryGetObject(out Object unityObject)) 
+            {
+                throw new System.Exception($"Cannot instantiate {serializableInterface} because it's has no reference of type UnityEngine.Object");
+            }
+
+            Object instantiatedObject = Object.Instantiate(unityObject);
+
+            return GetInterfaceReference<TInterface>(instantiatedObject);
+        }
+
+        public static TInterface Instantiate<TInterface>(this SerializableInterface<TInterface> serializableInterface, Transform parent) where TInterface : class
+        {
+            if (!serializableInterface.TryGetObject(out Object unityObject))
+            {
+                throw new System.Exception($"Cannot instantiate {serializableInterface} because it's has no reference of type UnityEngine.Object");
+            }
+
+            Object instantiatedObject = Object.Instantiate(unityObject, parent);
+
+            return GetInterfaceReference<TInterface>(instantiatedObject);
+        }        
+
+        public static TInterface Instantiate<TInterface>(this SerializableInterface<TInterface> serializableInterface, Vector3 position, Quaternion rotation) where TInterface : class
+        {
+            if (!serializableInterface.TryGetObject(out Object unityObject))
+            {
+                throw new System.Exception($"Cannot instantiate {serializableInterface} because it's has no reference of type UnityEngine.Object");
+            }
+
+            Object instantiatedObject = Object.Instantiate(unityObject, position, rotation);
+
+            return GetInterfaceReference<TInterface>(instantiatedObject);
+        }
+
+        public static TInterface Instantiate<TInterface>(this SerializableInterface<TInterface> serializableInterface, Vector3 position, Quaternion rotation, Transform parent) where TInterface : class
+        {
+            if (!serializableInterface.TryGetObject(out Object unityObject))
+            {
+                throw new System.Exception($"Cannot instantiate {serializableInterface} because it's has no reference of type UnityEngine.Object");
+            }
+
+            Object instantiatedObject = Object.Instantiate(unityObject, position, rotation, parent);
+
+            return GetInterfaceReference<TInterface>(instantiatedObject);
+        }
+
+        private static TInterface GetInterfaceReference<TInterface>(Object instantiatedObject) where TInterface : class
+        {
+            if (instantiatedObject is GameObject gameObject)
+                return gameObject.TryGetComponent(out TInterface component) ? component : null;
+
+            return instantiatedObject as TInterface;
+        }
     }
 }

Runtime/SerializableInterface.cs

@@ -57,5 +57,14 @@ object ISerializableInterface.GetRawReference()
         {
             return rawReference;
         }
+
+        public bool TryGetObject(out UnityEngine.Object unityObject)
+        {
+            unityObject = null;
+            if (mode != ReferenceMode.Unity) return false;
+
+            unityObject = unityReference;
+            return true;
+        }
     }
 }