Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/tracked_preference_helper.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 CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCE_HELPER_H_
-#define CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCE_HELPER_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "chrome/browser/prefs/tracked/pref_hash_filter.h"
-#include "chrome/browser/prefs/tracked/pref_hash_store_transaction.h"
-
-// A TrackedPreferenceHelper is a helper class for TrackedPreference which
-// handles decision making and reporting for TrackedPreference's
-// implementations.
-class TrackedPreferenceHelper {
- public:
-  enum ResetAction {
-    DONT_RESET,
-    // WANTED_RESET is reported when DO_RESET would have been reported but the
-    // current |enforcement_level| doesn't allow a reset for the detected state.
-    WANTED_RESET,
-    DO_RESET,
-  };
-
-  TrackedPreferenceHelper(const std::string& pref_path,
-                          size_t reporting_id,
-                          size_t reporting_ids_count,
-                          PrefHashFilter::EnforcementLevel enforcement_level,
-                          PrefHashFilter::ValueType value_type);
-
-  // Returns a ResetAction stating whether a reset is desired (DO_RESET) or not
-  // (DONT_RESET) based on observing |value_state|. Can also return WANTED_RESET
-  // if a reset would have been desired but the current |enforcement_level|
-  // doesn't allow it.
-  ResetAction GetAction(
-      PrefHashStoreTransaction::ValueState value_state) const;
-
-  // Returns true if the preference value may contain personal information.
-  bool IsPersonal() const;
-
-  // Reports |value_state| via UMA under |reporting_id_|.
-  void ReportValidationResult(
-      PrefHashStoreTransaction::ValueState value_state) const;
-
-  // Reports |reset_action| via UMA under |reporting_id_|.
-  void ReportAction(ResetAction reset_action) const;
-
-  // Reports, via UMA, the |count| of split preference entries that were
-  // considered invalid in a CHANGED event.
-  void ReportSplitPreferenceChangedCount(size_t count) const;
-
- private:
-  const std::string pref_path_;
-
-  const size_t reporting_id_;
-  const size_t reporting_ids_count_;
-
-  // Deny setting changes and hash seeding/migration.
-  const bool enforce_;
-
-  const bool personal_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrackedPreferenceHelper);
-};
-
-#endif  // CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCE_HELPER_H_