// 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/span_id.h"

#include <cstring>

#include <string>

#include "absl/strings/escaping.h"

#include "absl/strings/string_view.h"

namespace opencensus {

namespace trace {

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

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

  return absl::BytesToHexString(

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

}

const void *SpanId::Value() const { return rep_; }

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

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

}

bool SpanId::IsValid() const {

  static_assert(kSize == 8,

                "IsValid assumes the internal representation is 8 bytes.");

  uint64_t tmp;

  memcpy(&tmp, rep_, kSize);

  return tmp != 0;

}

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

}  // namespace trace

}  // namespace opencensus