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Side by Side Diff: components/user_prefs/tracked/tracked_preference.h

Issue 2782803002: Move tracked prefs into services/preferences/tracked. (Closed)
Patch Set: rebase Created 3 years, 8 months ago
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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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