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| 1 // Copyright 2013 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 CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_ |
| 6 #define CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 |
| 12 class PrefHashTracker; |
| 13 |
| 14 namespace base { |
| 15 class Value; |
| 16 } // namespace base |
| 17 |
| 18 // Stores hashes of and verifies preference values. To use, first call |
| 19 // |InitializeTrackedValue| with each preference that should be tracked. Then |
| 20 // call |OnPrefValueChanged| to update the hash store when preference values |
| 21 // change. |
| 22 class PrefHashStore { |
| 23 public: |
| 24 virtual ~PrefHashStore() {} |
| 25 |
| 26 enum ValueState { |
| 27 // The preference value corresponds to its stored hash. |
| 28 UNCHANGED, |
| 29 // The preference has been cleared since the last hash. |
| 30 CLEARED, |
| 31 // The preference value corresponds to its stored hash, which was calculated |
| 32 // using a legacy hash algorithm. |
| 33 MIGRATED, |
| 34 // The preference value has been changed since the last hash. |
| 35 CHANGED, |
| 36 // No stored hash exists for the preference value. |
| 37 UNKNOWN_VALUE, |
| 38 }; |
| 39 |
| 40 // Checks |initial_value| against the existing stored value hash. |
| 41 virtual ValueState CheckValue( |
| 42 const std::string& path, const base::Value* initial_value) const = 0; |
| 43 |
| 44 // Stores a hash of the current value of the preference at |path|. |
| 45 virtual void StoreHash(const std::string& path, |
| 46 const base::Value* value) = 0; |
| 47 }; |
| 48 |
| 49 #endif // CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_ |
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