safeOutputFile.h

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//
// Copyright 2017 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_BASE_TF_SAFE_OUTPUT_FILE_H
#define PXR_BASE_TF_SAFE_OUTPUT_FILE_H


#include "pxr/pxr.h"
#include "pxr/base/tf/api.h"

#include <cstdio>
#include <memory>
#include <string>

PXR_NAMESPACE_OPEN_SCOPE

class TfSafeOutputFile
{
    TfSafeOutputFile(TfSafeOutputFile const &) = delete;
    TfSafeOutputFile &operator=(TfSafeOutputFile const &) = delete;
public:
    TfSafeOutputFile() = default;

    TfSafeOutputFile(TfSafeOutputFile &&other)
        : _file(other._file)
        , _targetFileName(std::move(other._targetFileName))
        , _tempFileName(std::move(other._tempFileName))
        { other._file = nullptr; }

    TfSafeOutputFile &operator=(TfSafeOutputFile &&other) {
        _file = other._file;
        _targetFileName = std::move(other._targetFileName);
        _tempFileName = std::move(other._tempFileName);
        other._file = nullptr;
        return *this;
    }

    TF_API ~TfSafeOutputFile();

    TF_API static TfSafeOutputFile Update(std::string const &fileName);

    TF_API static TfSafeOutputFile Replace(std::string const &fileName);

    TF_API void Close();

    TF_API void Discard();

    FILE *Get() const { return _file; }
    
    TF_API FILE *ReleaseUpdatedFile();

    TF_API bool IsOpenForUpdate() const;

private:
    FILE *_file = nullptr;
    std::string _targetFileName;
    std::string _tempFileName;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_BASE_TF_SAFE_OUTPUT_FILE_H