73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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// Copyright (C) 2021 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ICING_FILE_DESTRUCTIBLE_FILE_H_
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#define ICING_FILE_DESTRUCTIBLE_FILE_H_
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#include <unistd.h>
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#include <string>
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#include "icing/file/filesystem.h"
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#include "icing/util/logging.h"
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namespace icing {
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namespace lib {
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// A convenient RAII class which will open the specified file path for write and
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// delete the underlying file upon destruction.
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class DestructibleFile {
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public:
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explicit DestructibleFile(const std::string& filepath,
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const Filesystem* filesystem)
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: filesystem_(filesystem), filepath_(filepath) {
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fd_ = filesystem_->OpenForWrite(filepath_.c_str());
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}
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DestructibleFile(const DestructibleFile&) = delete;
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DestructibleFile(DestructibleFile&& other) : filesystem_(nullptr), fd_(-1) {
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*this = std::move(other);
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}
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DestructibleFile& operator=(const DestructibleFile&) = delete;
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DestructibleFile& operator=(DestructibleFile&& other) {
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std::swap(fd_, other.fd_);
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std::swap(filesystem_, other.filesystem_);
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std::swap(filepath_, other.filepath_);
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return *this;
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}
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~DestructibleFile() {
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if (is_valid()) {
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close(fd_);
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if (!filesystem_->DeleteFile(filepath_.c_str())) {
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ICING_VLOG(1) << "Failed to delete file " << filepath_;
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}
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}
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}
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bool is_valid() const { return fd_ >= 0; }
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int get_fd() const { return fd_; }
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private:
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const Filesystem* filesystem_;
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std::string filepath_;
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int fd_;
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};
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} // namespace lib
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} // namespace icing
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#endif // ICING_FILE_DESTRUCTIBLE_FILE_H_
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