Index: chrome/browser/prefs/tracked/tracked_preference_helper.h |
diff --git a/chrome/browser/prefs/tracked/tracked_preference_helper.h b/chrome/browser/prefs/tracked/tracked_preference_helper.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..42d8e16a2f305049980d9f4942cd24ef27fa4f41 |
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+++ b/chrome/browser/prefs/tracked/tracked_preference_helper.h |
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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 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/pref_hash_filter.h" |
+#include "chrome/browser/prefs/pref_hash_store.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); |
+ |
+ // Returns a ResetAction stating whether a reset is desired (DO_RESET) based |
+ // on observing |value_state| or not (DONT_RESET). |allow_changes_|, |
+ // |allow_seeding_|, and |allow_migration_| make the decision softer in favor |
+ // of WANTED_RESET over DO_RESET in various scenarios. |
+ ResetAction GetAction(PrefHashStore::ValueState value_state) const; |
+ |
+ // Reports |value_state| via UMA under |reporting_id_|. |
+ void ReportValidationResult(PrefHashStore::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_; |
+ |
+ // Allow setting changes. |
+ const bool allow_changes_; |
+ // Allow seeding unknown values for atomic preferences. |
+ const bool allow_seeding_; |
+ // Allow migration of values validated by the old MAC algorithm. |
+ const bool allow_migration_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(TrackedPreferenceHelper); |
+}; |
+ |
+#endif // CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCE_HELPER_H_ |