blob: 20acef85c4ba850be914129fb5b5e2d10cb2e010 [file] [log] [blame]
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "core/payload.h"
namespace location {
namespace nearby {
namespace connections {
// Payload is default-constructible, and moveable, but not copyable container
// that holds at most one instance of one of:
// ByteArray, InputStream, or InputFile.
Payload::Payload(Payload&& other) noexcept = default;
Payload::~Payload() = default;
Payload& Payload::operator=(Payload&& other) noexcept = default;
// Default (invalid) payload.
Payload::Payload() : content_(absl::monostate()) {}
// Constructors for outgoing payloads.
Payload::Payload(ByteArray&& bytes) : content_(std::move(bytes)) {}
Payload::Payload(const ByteArray& bytes) : content_(bytes) {}
Payload::Payload(InputFile file)
: content_(std::move(file)),
id_(std::hash<std::string>()(file.GetFilePath())) {}
// TODO(jfcarroll): Convert std::function to function pointer
Payload::Payload(std::function<InputStream&()> stream)
: content_(std::move(stream)) {}
// Constructors for incoming payloads.
Payload::Payload(Id id, ByteArray&& bytes)
: content_(std::move(bytes)), id_(id) {}
Payload::Payload(Id id, const ByteArray& bytes) : content_(bytes), id_(id) {}
Payload::Payload(Id id, InputFile file) : content_(std::move(file)), id_(id) {}
// TODO(jfcarroll): Convert std::function to function pointer
Payload::Payload(Id id, std::function<InputStream&()> stream)
: content_(std::move(stream)), id_(id) {}
// Returns ByteArray payload, if it has been defined, or empty ByteArray.
const ByteArray& Payload::AsBytes() const& {
static const ByteArray empty; // NOLINT: function-level static is OK.
auto* result = absl::get_if<ByteArray>(&content_);
return result ? *result : empty;
}
ByteArray&& Payload::AsBytes() && {
auto* result = absl::get_if<ByteArray>(&content_);
return result ? std::move(*result) : std::move(ByteArray());
}
// Returns InputStream* payload, if it has been defined, or nullptr.
InputStream* Payload::AsStream() {
auto* result = absl::get_if<std::function<InputStream&()>>(&content_);
return result ? &(*result)() : nullptr;
}
// Returns InputFile* payload, if it has been defined, or nullptr.
InputFile* Payload::AsFile() { return absl::get_if<InputFile>(&content_); }
// Returns Payload unique ID.
Payload::Id Payload::GetId() const { return id_; }
// Returns Payload type.
Payload::Type Payload::GetType() const { return type_; }
// Sets the payload offset in bytes
void Payload::SetOffset(size_t offset) {
CHECK(type_ == Type::kFile || type_ == Type::kStream);
InputFile* file = AsFile();
if (file != nullptr) {
CHECK(file->GetTotalSize() > 0 && offset < (size_t)file->GetTotalSize());
}
offset_ = offset;
}
size_t Payload::GetOffset() { return offset_; }
// Generate Payload Id; to be passed to outgoing file constructor.
Payload::Id Payload::GenerateId() { return Prng().NextInt64(); }
Payload::Type Payload::FindType() const {
return static_cast<Type>(content_.index());
}
} // namespace connections
} // namespace nearby
} // namespace location