components/user_prefs/tracked/tracked_atomic_preference.h

// 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_ATOMIC_PREFERENCE_H_
#define COMPONENTS_USER_PREFS_TRACKED_ATOMIC_PREFERENCE_H_

#include <stddef.h>

#include <string>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "components/user_prefs/tracked/pref_hash_filter.h"
#include "components/user_prefs/tracked/tracked_preference.h"
#include "components/user_prefs/tracked/tracked_preference_helper.h"

class TrackedPreferenceValidationDelegate;

// A TrackedAtomicPreference is tracked as a whole. A hash is stored for its
// entire value and it is entirely reset on mismatch. An optional delegate is
// notified of the status of the preference during enforcement.
class TrackedAtomicPreference : public TrackedPreference {
 public:
  TrackedAtomicPreference(const std::string& pref_path,
                          size_t reporting_id,
                          size_t reporting_ids_count,
                          PrefHashFilter::EnforcementLevel enforcement_level,
                          PrefHashFilter::ValueType value_type,
                          TrackedPreferenceValidationDelegate* delegate);

  // TrackedPreference implementation.
  void OnNewValue(const base::Value* value,
                  PrefHashStoreTransaction* transaction) const override;
  bool EnforceAndReport(base::DictionaryValue* pref_store_contents,
                        PrefHashStoreTransaction* transaction) const override;

 private:
  const std::string pref_path_;
  const TrackedPreferenceHelper helper_;
  TrackedPreferenceValidationDelegate* delegate_;

  DISALLOW_COPY_AND_ASSIGN(TrackedAtomicPreference);
};

#endif  // COMPONENTS_USER_PREFS_TRACKED_ATOMIC_PREFERENCE_H_