1 // Copyright 2016 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
6 #define COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
11 #include "base/compiler_specific.h"
12 #include "base/observer_list.h"
13 #include "base/strings/string_piece.h"
14 #include "base/values.h"
15 #include "components/prefs/persistent_pref_store.h"
16 #include "components/prefs/pref_value_map.h"
18 // A light-weight prefstore implementation that keeps preferences
19 // in a memory backed store. This is not a persistent prefstore -- we
20 // subclass the PersistentPrefStore here since it is needed by the
21 // PrefService, which in turn is needed by various components.
22 class COMPONENTS_PREFS_EXPORT InMemoryPrefStore : public PersistentPrefStore {
26 InMemoryPrefStore(const InMemoryPrefStore&) = delete;
27 InMemoryPrefStore& operator=(const InMemoryPrefStore&) = delete;
29 // PrefStore implementation.
30 bool GetValue(base::StringPiece key,
31 const base::Value** result) const override;
32 base::Value::Dict GetValues() const override;
33 void AddObserver(PrefStore::Observer* observer) override;
34 void RemoveObserver(PrefStore::Observer* observer) override;
35 bool HasObservers() const override;
36 bool IsInitializationComplete() const override;
38 // PersistentPrefStore implementation.
39 bool GetMutableValue(const std::string& key, base::Value** result) override;
40 void ReportValueChanged(const std::string& key, uint32_t flags) override;
41 void SetValue(const std::string& key,
43 uint32_t flags) override;
44 void SetValueSilently(const std::string& key,
46 uint32_t flags) override;
47 void RemoveValue(const std::string& key, uint32_t flags) override;
48 bool ReadOnly() const override;
49 PrefReadError GetReadError() const override;
50 PersistentPrefStore::PrefReadError ReadPrefs() override;
51 void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override {}
52 void SchedulePendingLossyWrites() override {}
53 void OnStoreDeletionFromDisk() override {}
54 bool IsInMemoryPrefStore() const override;
55 void RemoveValuesByPrefixSilently(const std::string& prefix) override;
58 ~InMemoryPrefStore() override;
61 // Stores the preference values.
64 base::ObserverList<PrefStore::Observer, true>::Unchecked observers_;
67 #endif // COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_