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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_TAB_GROUPS_TOKEN_ID_H_
#define COMPONENTS_TAB_GROUPS_TOKEN_ID_H_
#include <ostream>
#include "base/component_export.h"
#include "base/token.h"
namespace tab_groups {
// A class template for token based ids. For new use cases, instantiate a new
// class from this template using itself as the argument (CRTP), so that the ids
// are not comparable to other use cases' ids. See tab_groups::TabGroupId for an
// example of this.
template <class T>
class COMPONENT_EXPORT(TAB_GROUPS) TokenId {
public:
static T GenerateNew() { return T(TokenId(base::Token::CreateRandom())); }
// This should only called with |token| returned from a previous |token()|
// call on a valid TokenId.
static T FromRawToken(base::Token token) { return T(TokenId(token)); }
// Should only be used if intending to populate the TokenId by reference,
// using a valid existing ID. Primarily needed for the extensions API.
static T CreateEmpty() { return T(TokenId(base::Token())); }
TokenId(const TokenId<T>& other) = default;
TokenId<T>& operator=(const TokenId<T>& other) = default;
friend bool operator==(const TokenId<T>&, const TokenId<T>&) = default;
friend auto operator<=>(const TokenId<T>&, const TokenId<T>&) = default;
const base::Token& token() const { return token_; }
bool is_empty() const { return token_.is_zero(); }
std::string ToString() const { return token_.ToString(); }
private:
explicit TokenId(base::Token token) : token_(token) {}
base::Token token_;
};
// For use in std::unordered_map.
template <class T>
struct COMPONENT_EXPORT(TAB_GROUPS) TokenIdHash {
public:
size_t operator()(const TokenId<T>& token_id) const {
return base::TokenHash()(token_id.token());
}
};
// Stream operator so TokenId objects can be used in logging statements.
template <class T>
std::ostream& operator<<(std::ostream& out, const TokenId<T>& token_id) {
return out << token_id.ToString();
}
} // namespace tab_groups
#endif // COMPONENTS_TAB_GROUPS_TOKEN_ID_H_
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