JsonStringifyArchive.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Serialization/ArchiveUObject.h"
#include "Serialization/MemoryWriter.h"
#include "PrettyJsonWriter.h"
 
struct FCustomVersion;
 
namespace UE::Private
{
 
struct FJsonStringifyImpl;
 
// Serial in the name of this type is meant to refer to 'UObject::Serialize(FArchive&)'. 
// This writer writes the resulting byte stream safely to json.
struct FJsonStringifyArchive final : private FArchiveUObject
{
    FJsonStringifyArchive(
        const UObject* InObject, 
        int32 InitialIndentLevel, 
        FJsonStringifyImpl* InRootImpl,
        TArray<FCustomVersion>& InVersionsToHarvest,
        bool bFilterEditorOnly);
 
    // FMemoryWriter wants to work with TArray<uint8>
    // so that's what we're returning:
    TArray<uint8> ToJson();
private:
    TArray<uint8> GetNullStream() const;
 
    virtual void Serialize(void* V, int64 Length) override;
    #if WITH_EDITOR
    virtual void SerializeBool(bool& D) override;
    #endif
    virtual FArchive& operator<<(UObject*& Value) override;
    virtual FArchive& operator<<(FField*& Value) override;
    virtual FArchive& operator<<(struct FLazyObjectPtr& Value) override;
    virtual FArchive& operator<<(struct FObjectPtr& Value) override;
    virtual FArchive& operator<<(struct FSoftObjectPtr& Value) override;
    virtual FArchive& operator<<(struct FSoftObjectPath& Value) override;
    virtual FArchive& operator<<(struct FWeakObjectPtr& Value) override;
    // overrides for strings:
    virtual FArchive& operator<<(FName& Value) override;
    virtual FArchive& operator<<(FText& Value) override;
 
    const UObject* const ObjectBeingStreamSerialized;
    FJsonStringifyImpl* RootImpl;
 
    TArray<uint8> Result;
    FMemoryWriter MemoryWriter;
    TSharedRef<UE::Private::FPrettyJsonWriter> Writer;
    int32 InitialIndentLevel;
    TArray<FCustomVersion>& VersionsToHarvest;
};
 
}