mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
Alexey Polyudov
b724d792dd
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I9a7d3c3d9790dc58c0d4c2bd2134499337b9a17b
110 lines
3.7 KiB
C++
110 lines
3.7 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 CORE_PAYLOAD_H_
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#define CORE_PAYLOAD_H_
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#include <cstdint>
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#include <functional>
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#include <memory>
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#include <utility>
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#include "platform/base/byte_array.h"
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#include "platform/base/input_stream.h"
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#include "platform/base/payload_id.h"
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#include "platform/base/prng.h"
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#include "platform/public/file.h"
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#include "absl/types/variant.h"
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namespace location {
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namespace nearby {
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namespace connections {
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// Payload is default-constructible, and moveable, but not copyable container
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// that holds at most one instance of one of:
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// ByteArray, InputStream, or InputFile.
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class Payload {
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public:
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using Id = PayloadId;
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// Order of types in variant, and values in Type enum is important.
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// Enum values must match respective variant types.
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using Content = absl::variant<absl::monostate, ByteArray,
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std::function<InputStream&()>, InputFile>;
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enum class Type { kUnknown = 0, kBytes = 1, kStream = 2, kFile = 3 };
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Payload(Payload&& other) = default;
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~Payload() = default;
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Payload& operator=(Payload&& other) = default;
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// Default (invalid) payload.
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Payload() : content_(absl::monostate()) {}
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// Constructors for outgoing payloads.
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explicit Payload(ByteArray&& bytes) : content_(std::move(bytes)) {}
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explicit Payload(const ByteArray& bytes) : content_(bytes) {}
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explicit Payload(std::function<InputStream&()> stream)
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: content_(std::move(stream)) {}
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// Constructors for incoming payloads.
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Payload(Id id, ByteArray&& bytes) : content_(std::move(bytes)), id_(id) {}
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Payload(Id id, const ByteArray& bytes) : content_(bytes), id_(id) {}
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Payload(Id id, std::function<InputStream&()> stream)
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: content_(std::move(stream)), id_(id) {}
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// Constructor for incoming and outgoing file payloads.
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Payload(Id id, InputFile file) : content_(std::move(file)), id_(id) {}
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// Returns ByteArray payload, if it has been defined, or empty ByteArray.
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const ByteArray& AsBytes() const& {
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static const ByteArray empty; // NOLINT: function-level static is OK.
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auto* result = absl::get_if<ByteArray>(&content_);
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return result ? *result : empty;
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}
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ByteArray&& AsBytes() && {
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auto* result = absl::get_if<ByteArray>(&content_);
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return result ? std::move(*result) : std::move(ByteArray());
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}
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// Returns InputStream* payload, if it has been defined, or nullptr.
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InputStream* AsStream() {
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auto* result = absl::get_if<std::function<InputStream&()>>(&content_);
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return result ? &(*result)() : nullptr;
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}
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// Returns InputFile* payload, if it has been defined, or nullptr.
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InputFile* AsFile() { return absl::get_if<InputFile>(&content_); }
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// Returns Payload unique ID.
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Id GetId() const { return id_; }
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// Returns Payload type.
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Type GetType() const { return type_; }
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// Generate Payload Id; to be passed to outgoing file constructor.
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static Id GenerateId() { return Prng().NextInt64(); }
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private:
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Type FindType(const Content& content) const {
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return static_cast<Type>(content_.index());
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}
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Content content_;
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Id id_{GenerateId()};
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Type type_{FindType(content_)};
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};
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} // namespace connections
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} // namespace nearby
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} // namespace location
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#endif // CORE_PAYLOAD_H_
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