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// Copyright 2015 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_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_CLIENT_H_
#define COMPONENTS_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_CLIENT_H_
#include <string_view>
#include "base/memory/ref_counted.h"
#include "base/values.h"
namespace sync_preferences {
class SyncablePrefsDatabase;
// This class allows the embedder to configure the PrefModelAssociator to
// have a different behaviour when receiving preference synchronisations
// events from the server.
class PrefModelAssociatorClient
: public base::RefCounted<PrefModelAssociatorClient> {
public:
PrefModelAssociatorClient(const PrefModelAssociatorClient&) = delete;
PrefModelAssociatorClient& operator=(const PrefModelAssociatorClient&) =
delete;
// Returns the merged value if the client wants to apply a custom merging
// strategy to the preference named |pref_name| with local value |local_value|
// and server-provided value |server_value|. Otherwise, returns |nullptr| and
// the server's value will be chosen.
virtual base::Value MaybeMergePreferenceValues(
std::string_view pref_name,
const base::Value& local_value,
const base::Value& server_value) const = 0;
// Returns a pointer to the instance of SyncablePrefsDatabase. This should
// define the list of syncable preferences.
virtual const SyncablePrefsDatabase& GetSyncablePrefsDatabase() const = 0;
protected:
friend class base::RefCounted<PrefModelAssociatorClient>;
PrefModelAssociatorClient() = default;
virtual ~PrefModelAssociatorClient() = default;
};
} // namespace sync_preferences
#endif // COMPONENTS_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_CLIENT_H_
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