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/*
* Copyright 2024 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.
*/
#ifndef API_STATS_ATTRIBUTE_H_
#define API_STATS_ATTRIBUTE_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "absl/types/variant.h"
#include "rtc_base/checks.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// A light-weight wrapper of an RTCStats attribute, i.e. an individual metric of
// type absl::optional<T>.
class RTC_EXPORT Attribute {
public:
// All supported attribute types.
typedef absl::variant<const absl::optional<bool>*,
const absl::optional<int32_t>*,
const absl::optional<uint32_t>*,
const absl::optional<int64_t>*,
const absl::optional<uint64_t>*,
const absl::optional<double>*,
const absl::optional<std::string>*,
const absl::optional<std::vector<bool>>*,
const absl::optional<std::vector<int32_t>>*,
const absl::optional<std::vector<uint32_t>>*,
const absl::optional<std::vector<int64_t>>*,
const absl::optional<std::vector<uint64_t>>*,
const absl::optional<std::vector<double>>*,
const absl::optional<std::vector<std::string>>*,
const absl::optional<std::map<std::string, uint64_t>>*,
const absl::optional<std::map<std::string, double>>*>
StatVariant;
template <typename T>
Attribute(const char* name, const absl::optional<T>* attribute)
: name_(name), attribute_(attribute) {}
const char* name() const;
const StatVariant& as_variant() const;
bool has_value() const;
template <typename T>
bool holds_alternative() const {
return absl::holds_alternative<const absl::optional<T>*>(attribute_);
}
template <typename T>
const absl::optional<T>& as_optional() const {
RTC_CHECK(holds_alternative<T>());
return *absl::get<const absl::optional<T>*>(attribute_);
}
template <typename T>
const T& get() const {
RTC_CHECK(holds_alternative<T>());
RTC_CHECK(has_value());
return absl::get<const absl::optional<T>*>(attribute_)->value();
}
bool is_sequence() const;
bool is_string() const;
std::string ToString() const;
bool operator==(const Attribute& other) const;
bool operator!=(const Attribute& other) const;
private:
const char* name_;
StatVariant attribute_;
};
struct RTC_EXPORT AttributeInit {
AttributeInit(const char* name, const Attribute::StatVariant& variant);
const char* name;
Attribute::StatVariant variant;
};
} // namespace webrtc
#endif // API_STATS_ATTRIBUTE_H_
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