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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_STORAGE_ACCESS_API_SITE_PAIR_CACHE_H_
#define CHROME_BROWSER_STORAGE_ACCESS_API_SITE_PAIR_CACHE_H_
#include <utility>
#include "base/containers/flat_set.h"
namespace net {
class SchemefulSite;
} // namespace net
namespace url {
class Origin;
} // namespace url
// A container that holds pairs of (schemeful) sites. This class is designed to
// avoid the cost of converting from origin to site if possible (assuming that
// map lookups are faster than converting).
class SitePairCache {
public:
SitePairCache();
SitePairCache(const SitePairCache&) = delete;
SitePairCache& operator=(const SitePairCache&) = delete;
~SitePairCache();
// Inserts into the cache if necessary. Returns true if a new <site, site>
// pair was inserted; false if the <site, site> pair was already present.
bool Insert(const url::Origin& first, const url::Origin& second);
// Clears the cache.
void Clear();
private:
// First layer of the cache: by origin. This lets us avoid converting to
// SchemefulSites for pairs that have already been inserted.
base::flat_set<std::pair<url::Origin, url::Origin>> origins_;
// Second layer of the cache: by SchemefulSite. This is the final source of
// truth for the contents of this cache.
base::flat_set<std::pair<net::SchemefulSite, net::SchemefulSite>> sites_;
};
#endif // CHROME_BROWSER_STORAGE_ACCESS_API_SITE_PAIR_CACHE_H_
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