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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_TRACKED_PREFERENCE_H_ | |
6 #define COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_ | |
7 | |
8 class PrefHashStoreTransaction; | |
9 | |
10 namespace base { | |
11 class DictionaryValue; | |
12 class Value; | |
13 } | |
14 | |
15 enum class TrackedPreferenceType { ATOMIC, SPLIT }; | |
16 | |
17 // A TrackedPreference tracks changes to an individual preference, reporting and | |
18 // reacting to them according to preference-specific and browser-wide policies. | |
19 class TrackedPreference { | |
20 public: | |
21 virtual ~TrackedPreference() {} | |
22 | |
23 virtual TrackedPreferenceType GetType() const = 0; | |
24 | |
25 // Notifies the underlying TrackedPreference about its new |value| which | |
26 // can update hashes in the corresponding hash store via |transaction|. | |
27 virtual void OnNewValue(const base::Value* value, | |
28 PrefHashStoreTransaction* transaction) const = 0; | |
29 | |
30 // Verifies that the value of this TrackedPreference in |pref_store_contents| | |
31 // is valid. Responds to verification failures according to | |
32 // preference-specific and browser-wide policy and reports results to via UMA. | |
33 // May use |transaction| to check/modify hashes in the corresponding hash | |
34 // store. Performs validation and reports results without enforcing for | |
35 // |external_validation_transaction|. This call assumes exclusive access to | |
36 // |external_validation_transaction| and its associated state and as such | |
37 // should only be called before any other subsystem is made aware of it. | |
38 virtual bool EnforceAndReport( | |
39 base::DictionaryValue* pref_store_contents, | |
40 PrefHashStoreTransaction* transaction, | |
41 PrefHashStoreTransaction* external_validation_transaction) const = 0; | |
42 }; | |
43 | |
44 #endif // COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_ | |
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