Initial commit: Unity WordConnect project

Assets/WordConnectGameToolkit/VContainer/Runtime/Unity/InstanceProviders/SystemInstanceProvider.cs

@@ -0,0 +1,81 @@
+#if VCONTAINER_ECS_INTEGRATION
+using System;
+using System.Collections.Generic;
+using Unity.Entities;
+
+namespace VContainer.Unity
+{
+    public sealed class SystemInstanceProvider<T> : IInstanceProvider where T : ComponentSystemBase
+    {
+        readonly Type systemType;
+        readonly IInjector injector;
+        readonly IReadOnlyList<IInjectParameter> customParameters;
+        readonly string worldName;
+        readonly Type systemGroupType;
+
+        World world;
+        T instance;
+
+        public SystemInstanceProvider(
+            Type systemType,
+            string worldName,
+            Type systemGroupType,
+            IInjector injector,
+            IReadOnlyList<IInjectParameter> customParameters)
+        {
+            this.systemType = systemType;
+            this.worldName = worldName;
+            this.systemGroupType = systemGroupType;
+            this.injector = injector;
+            this.customParameters = customParameters;
+        }
+
+        public object SpawnInstance(IObjectResolver resolver)
+        {
+            if (world is null)
+                world = GetWorld(resolver);
+
+            if (instance is null)
+            {
+                instance = (T) injector.CreateInstance(resolver, customParameters);
+#if UNITY_2022_2_OR_NEWER
+                world.AddSystemManaged(instance);
+#else
+                world.AddSystem(instance);
+#endif
+
+                if (systemGroupType != null)
+                {
+#if UNITY_2022_2_OR_NEWER
+                    var systemGroup = (ComponentSystemGroup)world.GetOrCreateSystemManaged(systemGroupType);
+#else
+                    var systemGroup = (ComponentSystemGroup)world.GetOrCreateSystem(systemGroupType);
+#endif
+                    systemGroup.AddSystemToUpdateList(instance);
+                }
+
+                return instance;
+            }
+#if UNITY_2022_2_OR_NEWER
+            return world.GetExistingSystemManaged(systemType);
+#else
+            return world.GetExistingSystem(systemType);
+#endif
+        }
+
+        World GetWorld(IObjectResolver resolver)
+        {
+            if (worldName is null && World.DefaultGameObjectInjectionWorld != null)
+                return World.DefaultGameObjectInjectionWorld;
+
+            var worlds = resolver.Resolve<IEnumerable<World>>();
+            foreach (var world in worlds)
+            {
+                if (world.Name == worldName)
+                    return world;
+            }
+            throw new VContainerException(systemType, $"World `{worldName}` is not registered");
+        }
+    }
+}
+#endif