components/user_prefs/tracked/tracked_atomic_preference.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_USER_PREFS_TRACKED_ATOMIC_PREFERENCE_H_
   6 #define COMPONENTS_USER_PREFS_TRACKED_ATOMIC_PREFERENCE_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/macros.h"
  12 #include "components/user_prefs/tracked/pref_hash_filter.h"
  13 #include "components/user_prefs/tracked/tracked_preference.h"
  14 #include "components/user_prefs/tracked/tracked_preference_helper.h"
  15
  16 class TrackedPreferenceValidationDelegate;
  17
  18 // A TrackedAtomicPreference is tracked as a whole. A hash is stored for its
  19 // entire value and it is entirely reset on mismatch. An optional delegate is
  20 // notified of the status of the preference during enforcement.
  21 class TrackedAtomicPreference : public TrackedPreference {
  22  public:
  23   TrackedAtomicPreference(const std::string& pref_path,
  24                           size_t reporting_id,
  25                           size_t reporting_ids_count,
  26                           PrefHashFilter::EnforcementLevel enforcement_level,
  27                           PrefHashFilter::ValueType value_type,
  28                           TrackedPreferenceValidationDelegate* delegate);
  29
  30   // TrackedPreference implementation.
  31   void OnNewValue(const base::Value* value,
  32                   PrefHashStoreTransaction* transaction) const override;
  33   bool EnforceAndReport(base::DictionaryValue* pref_store_contents,
  34                         PrefHashStoreTransaction* transaction) const override;
  35
  36  private:
  37   const std::string pref_path_;
  38   const TrackedPreferenceHelper helper_;
  39   TrackedPreferenceValidationDelegate* delegate_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(TrackedAtomicPreference);
  42 };
  43
  44 #endif  // COMPONENTS_USER_PREFS_TRACKED_ATOMIC_PREFERENCE_H_