text: /*
   *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #include "api/stats/rtc_stats_report.h"
  
  #include <type_traits>
  #include <utility>
  
  #include "rtc_base/checks.h"
  #include "rtc_base/strings/string_builder.h"
  
  namespace webrtc {
  
  RTCStatsReport::ConstIterator::ConstIterator(
      const rtc::scoped_refptr<const RTCStatsReport>& report,
      StatsMap::const_iterator it)
      : report_(report), it_(it) {}
  
  RTCStatsReport::ConstIterator::ConstIterator(ConstIterator&& other) = default;
  
  RTCStatsReport::ConstIterator::~ConstIterator() {}
  
  RTCStatsReport::ConstIterator& RTCStatsReport::ConstIterator::operator++() {
    ++it_;
    return *this;
  }
  
  RTCStatsReport::ConstIterator& RTCStatsReport::ConstIterator::operator++(int) {
    return ++(*this);
  }
  
  const RTCStats& RTCStatsReport::ConstIterator::operator*() const {
    return *it_->second.get();
  }
  
  const RTCStats* RTCStatsReport::ConstIterator::operator->() const {
    return it_->second.get();
  }
  
  bool RTCStatsReport::ConstIterator::operator==(
      const RTCStatsReport::ConstIterator& other) const {
    return it_ == other.it_;
  }
  
  bool RTCStatsReport::ConstIterator::operator!=(
      const RTCStatsReport::ConstIterator& other) const {
    return !(*this == other);
  }
  
  rtc::scoped_refptr<RTCStatsReport> RTCStatsReport::Create(
      int64_t timestamp_us) {
    return rtc::scoped_refptr<RTCStatsReport>(
        new rtc::RefCountedObject<RTCStatsReport>(timestamp_us));
  }
  
  RTCStatsReport::RTCStatsReport(int64_t timestamp_us)
      : timestamp_us_(timestamp_us) {}
  
  RTCStatsReport::~RTCStatsReport() {}
  
  rtc::scoped_refptr<RTCStatsReport> RTCStatsReport::Copy() const {
    rtc::scoped_refptr<RTCStatsReport> copy = Create(timestamp_us_);
    for (auto it = stats_.begin(); it != stats_.end(); ++it) {
      copy->AddStats(it->second->copy());
    }
    return copy;
  }
  
  void RTCStatsReport::AddStats(std::unique_ptr<const RTCStats> stats) {
    auto result =
        stats_.insert(std::make_pair(std::string(stats->id()), std::move(stats)));
    RTC_DCHECK(result.second)
        << "A stats object with ID " << result.first->second->id()
        << " is already "
           "present in this stats report.";
  }
  
  const RTCStats* RTCStatsReport::Get(const std::string& id) const {
    StatsMap::const_iterator it = stats_.find(id);
    if (it != stats_.cend())
      return it->second.get();
    return nullptr;
  }
  
  std::unique_ptr<const RTCStats> RTCStatsReport::Take(const std::string& id) {
    StatsMap::iterator it = stats_.find(id);
    if (it == stats_.end())
      return nullptr;
    std::unique_ptr<const RTCStats> stats = std::move(it->second);
    stats_.erase(it);
    return stats;
  }
  
  void RTCStatsReport::TakeMembersFrom(rtc::scoped_refptr<RTCStatsReport> other) {
    for (StatsMap::iterator it = other->stats_.begin(); it != other->stats_.end();
         ++it) {
      AddStats(std::unique_ptr<const RTCStats>(it->second.release()));
    }
    other->stats_.clear();
  }
  
  RTCStatsReport::ConstIterator RTCStatsReport::begin() const {
    return ConstIterator(rtc::scoped_refptr<const RTCStatsReport>(this),
                         stats_.cbegin());
  }
  
  RTCStatsReport::ConstIterator RTCStatsReport::end() const {
    return ConstIterator(rtc::scoped_refptr<const RTCStatsReport>(this),
                         stats_.cend());
  }
  
  std::string RTCStatsReport::ToJson() const {
    if (begin() == end()) {
      return "";
    }
    rtc::StringBuilder sb;
    sb << "[";
    const char* separator = "";
    for (ConstIterator it = begin(); it != end(); ++it) {
      sb << separator << it->ToJson();
      separator = ",";
    }
    sb << "]";
    return sb.Release();
  }
  
  }  // namespace webrtc
  