// Copyright 2017, OpenCensus Authors

//

// 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

//

//     http://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 "opencensus/trace/trace_options.h"

#include <cstdint>

#include <string>

#include "absl/strings/escaping.h"

#include "absl/strings/string_view.h"

namespace opencensus {

namespace trace {

namespace {

// One bit per option.

constexpr uint8_t kIsSampled = 1;

}  // namespace

TraceOptions::TraceOptions(const uint8_t* buf) { memcpy(rep_, buf, kSize); }

bool TraceOptions::IsSampled() const { return rep_[0] & kIsSampled; }

bool TraceOptions::operator==(const TraceOptions& that) const {

  return memcmp(rep_, that.rep_, kSize) == 0;

}

std::string TraceOptions::ToHex() const {

  return absl::BytesToHexString(

      absl::string_view(reinterpret_cast<const char*>(rep_), kSize));

}

void TraceOptions::CopyTo(uint8_t* buf) const { memcpy(buf, rep_, kSize); }

TraceOptions TraceOptions::WithSampling(bool is_sampled) const {

  uint8_t buf[kSize];

  CopyTo(buf);

  buf[0] = (buf[0] & ~kIsSampled) | (is_sampled ? kIsSampled : 0);

  return TraceOptions(buf);

}

}  // namespace trace

}  // namespace opencensus