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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "IStructSerializerBackend.h"
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#include "Serialization/JsonWriter.h"
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/**
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* Implements a writer for UStruct serialization using Json.
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*
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* Note: The underlying Json serializer is currently hard-coded to use UCS2CHAR and pretty-print.
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* This is because the current JsonWriter API does not allow writers to be substituted since it's
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* all based on templates. At some point we will refactor the low-level Json API to provide more
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* flexibility for serialization.
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*/
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class SERIALIZATION_API FJsonStructSerializerBackend
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: public IStructSerializerBackend
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{
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public:
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/**
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* Creates and initializes a new legacy instance.
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* @note Deprecated, use the two-parameter constructor with EStructSerializerBackendFlags::Legacy if you need backwards compatibility with code compiled prior to 4.22.
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*
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* @param InArchive The archive to serialize into.
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*/
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UE_DEPRECATED(4.22, "Use the two-parameter constructor with EStructSerializerBackendFlags::Legacy only if you need backwards compatibility with code compiled prior to 4.22; otherwise use EStructSerializerBackendFlags::Default.")
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FJsonStructSerializerBackend( FArchive& InArchive )
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: JsonWriter(TJsonWriter<UCS2CHAR>::Create(&InArchive))
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, Flags(EStructSerializerBackendFlags::Legacy)
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{ }
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/**
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* Creates and initializes a new instance with the given flags.
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*
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* @param InArchive The archive to serialize into.
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* @param InFlags The flags that control the serialization behavior (typically EStructSerializerBackendFlags::Default).
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*/
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FJsonStructSerializerBackend( FArchive& InArchive, const EStructSerializerBackendFlags InFlags )
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: JsonWriter(TJsonWriter<UCS2CHAR>::Create(&InArchive))
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, Flags(InFlags)
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{ }
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public:
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// IStructSerializerBackend interface
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virtual void BeginArray(const FStructSerializerState& State) override;
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virtual void BeginStructure(const FStructSerializerState& State) override;
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virtual void EndArray(const FStructSerializerState& State) override;
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virtual void EndStructure(const FStructSerializerState& State) override;
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virtual void WriteComment(const FString& Comment) override;
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virtual void WriteProperty(const FStructSerializerState& State, int32 ArrayIndex = 0) override;
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protected:
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// Allow access to the internal JsonWriter to subclasses
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TSharedRef<TJsonWriter<UCS2CHAR>>& GetWriter()
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{
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return JsonWriter;
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}
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private:
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/** Holds the Json writer used for the actual serialization. */
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TSharedRef<TJsonWriter<UCS2CHAR>> JsonWriter;
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/** Flags controlling the serialization behavior. */
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EStructSerializerBackendFlags Flags;
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};
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