PropertyProxyArchive.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*==================================================================================================
    PropertyProxyArchive.h: Simple proxy archive for serializing references to FFields from Bytecode
====================================================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/Object.h"
#include "Templates/Casts.h"
#include "UObject/UnrealType.h"
#include "UObject/FieldPath.h"
#include "Serialization/ArchiveProxy.h"
 
class FPropertyProxyArchive : public FArchiveProxy
{
public:
 
    UStruct::FUnresolvedScriptPropertiesArray UnresolvedProperties;
    int32& BytecodeIndex;
    UStruct* Container;
 
    FPropertyProxyArchive(FArchive& InInnerArchive, int32& InBytecodeIndex, UStruct* InContainer)
        : FArchiveProxy(InInnerArchive)
        , BytecodeIndex(InBytecodeIndex)
        , Container(InContainer)
    {
        ArIsFilterEditorOnly = InnerArchive.ArIsFilterEditorOnly;
    }
    virtual FArchive& operator<<(FField*& Value) override
    {
        if (!IsPersistent() || IsObjectReferenceCollector())
        {
            // For reference collectors (like FArchiveReplaceFieldReferences): fully serialize the entire field to find all of its UObject references
            InnerArchive << Value;
        }
 
        // Serialize the field as FFieldPath
        TFieldPath<FField> PropertyPath(Value);
        *this << PropertyPath;
        if (IsLoading())
        {
            Value = PropertyPath.Get(Container);
            if (!Value && !PropertyPath.IsPathToFieldEmpty())
            {
                // Store the field path for deferred resolving
                UnresolvedProperties.Add(TPair<TFieldPath<FField>, int32>(PropertyPath, BytecodeIndex));
            }
        }
        return *this;
    }
};