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Source/Engine/Content/Factories/JsonAssetFactory.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "IAssetFactory.h"
+#include "../JsonAsset.h"
+#include "Engine/Content/AssetInfo.h"
+
+/// <summary>
+/// The Json assets factory base class.
+/// </summary>
+/// <seealso cref="IAssetFactory" />
+class JsonAssetFactoryBase : public IAssetFactory
+{
+protected:
+
+    virtual JsonAssetBase* Create(const AssetInfo& info) = 0;
+
+public:
+
+    // [IAssetFactory]
+    Asset* New(const AssetInfo& info) override
+    {
+        return Create(info);
+    }
+
+    Asset* NewVirtual(const AssetInfo& info) override
+    {
+        return Create(info);
+    }
+};
+
+/// <summary>
+/// The Json assets factory.
+/// </summary>
+/// <seealso cref="JsonAssetFactoryBase" />
+template<typename T>
+class JsonAssetFactory : public JsonAssetFactoryBase
+{
+protected:
+
+    // [JsonAssetFactoryBase]
+    JsonAssetBase* Create(const AssetInfo& info) override
+    {
+        ScriptingObjectSpawnParams params(info.ID, T::TypeInitializer);
+        return ::New<T>(params, &info);
+    }
+};
+
+#define REGISTER_JSON_ASSET(type, typeName) \
+	const String type::TypeName = TEXT(typeName); \
+	class CONCAT_MACROS(Factory, type) : public JsonAssetFactory<type> \
+	{ \
+		public: \
+		CONCAT_MACROS(Factory, type)() { IAssetFactory::Get().Add(type::TypeName, this); } \
+		~CONCAT_MACROS(Factory, type)() { IAssetFactory::Get().Remove(type::TypeName); } \
+	}; \
+	static CONCAT_MACROS(Factory, type) CONCAT_MACROS(CFactory, type)