mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
Alexey Polyudov
ce4807935e
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: Ic2bdb234e89f3c5860d1b483dd4bce689f13d057
116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
// Copyright 2020 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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// https://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 PLATFORM_PUBLIC_FILE_H_
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#define PLATFORM_PUBLIC_FILE_H_
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#include <cstdint>
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#include <memory>
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#include <string>
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#include "platform/api/input_file.h"
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#include "platform/api/output_file.h"
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#include "platform/api/platform.h"
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#include "platform/base/byte_array.h"
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#include "platform/base/exception.h"
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#include "platform/base/input_stream.h"
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#include "platform/base/output_stream.h"
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namespace location {
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namespace nearby {
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class InputFile final {
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public:
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using Platform = api::ImplementationPlatform;
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InputFile(PayloadId payload_id, std::int64_t size)
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: impl_(Platform::CreateInputFile(payload_id, size)), id_(payload_id) {}
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~InputFile() = default;
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InputFile(InputFile&&) = default;
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InputFile& operator=(InputFile&&) = default;
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// Reads up to size bytes and returns as a ByteArray object wrapped by
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// ExceptionOr.
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// Returns Exception::kIo on error, or end of file.
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ExceptionOr<ByteArray> Read(std::int64_t size) { return impl_->Read(size); }
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// Returns a string that uniqely identifies this file.
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std::string GetFilePath() const { return impl_->GetFilePath(); }
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// Returns total size of this file in bytes.
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std::int64_t GetTotalSize() const { return impl_->GetTotalSize(); }
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// Disallows further reads from the file and frees system resources,
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// associated with it.
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Exception Close() { return impl_->Close(); }
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// Returns a handle to the underlying input stream.
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//
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// Returned handle will remain valid even if InputFile is moved, for as long
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// as original InputFile lifetime continues.
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// Side effects of any non-const operation invoked for InputFile (such as
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// Read, or Close will be observable through InputStream& handle, and vice
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// versa.
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InputStream& GetInputStream() { return *impl_; }
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// Returns payload id of this file. The closest "file" equivalent is inode.
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PayloadId GetPayloadId() const { return id_; }
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private:
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std::unique_ptr<api::InputFile> impl_;
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PayloadId id_;
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};
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class OutputFile final {
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public:
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using Platform = api::ImplementationPlatform;
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explicit OutputFile(PayloadId payload_id)
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: impl_(Platform::CreateOutputFile(payload_id)), id_(payload_id) {}
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~OutputFile() = default;
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OutputFile(OutputFile&&) = default;
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OutputFile& operator=(OutputFile&&) = default;
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// Writes all data from ByteArray object to the underlying stream.
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// Returns Exception::kIo on error, Exception::kSuccess otherwise.
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Exception Write(const ByteArray& data) { return impl_->Write(data); }
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// Ensures that all data written by previous calls to Write() is passed
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// down to the applicable transport layer.
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Exception Flush() { return impl_->Flush(); }
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// Disallows further writes to the file and frees system resources,
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// associated with it.
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Exception Close() { return impl_->Close(); }
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// Returns a handle to the underlying output stream.
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//
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// Returned handle will remain valid even if OutputFile is moved, for as long
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// as original OutputFile lifetime continues.
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// Side effects of any non-const operation invoked for OutputFile (such as
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// Write, or Close will be observable through OutputStream& handle, and vice
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// versa.
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OutputStream& GetOutputStream() { return *impl_; }
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// Returns payload id of this file. The closest "file" equivalent is inode.
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PayloadId GetPayloadId() const { return id_; }
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private:
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std::unique_ptr<api::OutputFile> impl_;
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PayloadId id_;
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};
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_PUBLIC_FILE_H_
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