Initial commit

Gems/ScriptCanvas/Code/Include/ScriptCanvas/Utils/SerializationUtils.h

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+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+
+#pragma once
+
+#include <AzCore/Serialization/SerializeContext.h>
+
+namespace ScriptCanvas
+{
+    class SerializationUtils
+    {
+    public:
+
+        // Removes one layer of base class from the reflection hiearchy.
+        // i.e. takes Derivied -> Parent -> Grandparent and converts it to Derived -> Grandparent
+        //
+        // Will keep all data in Grandparent while discarding all data in Parent.
+        static bool RemoveBaseClass([[maybe_unused]] AZ::SerializeContext& serializeContext, AZ::SerializeContext::DataElementNode& classElement)
+        {
+            AZ::SerializeContext::DataElementNode* operatorBaseClass = classElement.FindSubElement(AZ::Crc32("BaseClass1"));
+
+            if (operatorBaseClass == nullptr)
+            {
+                return false;
+            }
+
+            int nodeElementIndex = operatorBaseClass->FindElement(AZ_CRC("BaseClass1", 0xd4925735));
+
+            if (nodeElementIndex < 0)
+            {
+                return false;
+            }
+
+            // The DataElementNode is being copied purposefully in this statement to clone the data
+            AZ::SerializeContext::DataElementNode baseNodeElement = operatorBaseClass->GetSubElement(nodeElementIndex);
+
+            classElement.RemoveElementByName(AZ::Crc32("BaseClass1"));
+            classElement.AddElement(baseNodeElement);
+
+            return true;
+        }
+
+        // Used to shim in a new base class i.e. A > C becomes A > B > C with InsertNewBaseClass<B>
+        template<class ClassType>
+        static bool InsertNewBaseClass(AZ::SerializeContext& serializeContext, AZ::SerializeContext::DataElementNode& classElement)
+        {
+            bool addedBaseClass = true;
+
+            // Need to shim in a new class
+            AZ::SerializeContext::DataElementNode baseClassElement = (*classElement.FindSubElement(AZ_CRC("BaseClass1", 0xd4925735)));            
+            classElement.RemoveElementByName(AZ_CRC("BaseClass1", 0xd4925735));
+
+            classElement.AddElement<ClassType>(serializeContext, "BaseClass1");
+
+            AZ::SerializeContext::DataElementNode* newClassNode = classElement.FindSubElement(AZ_CRC("BaseClass1", 0xd4925735));
+
+            if (newClassNode)
+            {
+                newClassNode->AddElement(baseClassElement);
+            }
+            else
+            {
+                addedBaseClass = false;
+            }
+
+            return addedBaseClass;
+        }
+    };
+}