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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
#define COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
class PrefHashStoreTransaction;
namespace base {
class DictionaryValue;
class Value;
}
enum class TrackedPreferenceType { ATOMIC, SPLIT };
// A TrackedPreference tracks changes to an individual preference, reporting and
// reacting to them according to preference-specific and browser-wide policies.
class TrackedPreference {
public:
virtual ~TrackedPreference() {}
virtual TrackedPreferenceType GetType() const = 0;
// Notifies the underlying TrackedPreference about its new |value| which
// can update hashes in the corresponding hash store via |transaction|.
virtual void OnNewValue(const base::Value* value,
PrefHashStoreTransaction* transaction) const = 0;
// Verifies that the value of this TrackedPreference in |pref_store_contents|
// is valid. Responds to verification failures according to
// preference-specific and browser-wide policy and reports results to via UMA.
// May use |transaction| to check/modify hashes in the corresponding hash
// store. Performs validation and reports results without enforcing for
// |external_validation_transaction|. This call assumes exclusive access to
// |external_validation_transaction| and its associated state and as such
// should only be called before any other subsystem is made aware of it.
virtual bool EnforceAndReport(
base::DictionaryValue* pref_store_contents,
PrefHashStoreTransaction* transaction,
PrefHashStoreTransaction* external_validation_transaction) const = 0;
};
#endif // COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
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