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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_PREFS_PERSISTENT_PREF_STORE_H_ | 5 #ifndef BASE_PREFS_PERSISTENT_PREF_STORE_H_ |
6 #define BASE_PREFS_PERSISTENT_PREF_STORE_H_ | 6 #define BASE_PREFS_PERSISTENT_PREF_STORE_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/prefs/base_prefs_export.h" | 10 #include "base/prefs/base_prefs_export.h" |
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56 | 56 |
57 // Same as SetValue, but doesn't generate notifications. This is used by | 57 // Same as SetValue, but doesn't generate notifications. This is used by |
58 // PrefService::GetMutableUserPref() in order to put empty entries | 58 // PrefService::GetMutableUserPref() in order to put empty entries |
59 // into the user pref store. Using SetValue is not an option since existing | 59 // into the user pref store. Using SetValue is not an option since existing |
60 // tests rely on the number of notifications generated. | 60 // tests rely on the number of notifications generated. |
61 virtual void SetValueSilently(const std::string& key, base::Value* value) = 0; | 61 virtual void SetValueSilently(const std::string& key, base::Value* value) = 0; |
62 | 62 |
63 // Removes the value for |key|. | 63 // Removes the value for |key|. |
64 virtual void RemoveValue(const std::string& key) = 0; | 64 virtual void RemoveValue(const std::string& key) = 0; |
65 | 65 |
66 // Marks that the |key| with empty ListValue/DictionaryValue needs to be | |
67 // persisted. | |
68 virtual void MarkNeedsEmptyValue(const std::string& key) = 0; | |
69 | |
70 // Whether the store is in a pseudo-read-only mode where changes are not | 66 // Whether the store is in a pseudo-read-only mode where changes are not |
71 // actually persisted to disk. This happens in some cases when there are | 67 // actually persisted to disk. This happens in some cases when there are |
72 // read errors during startup. | 68 // read errors during startup. |
73 virtual bool ReadOnly() const = 0; | 69 virtual bool ReadOnly() const = 0; |
74 | 70 |
75 // Gets the read error. Only valid if IsInitializationComplete() returns true. | 71 // Gets the read error. Only valid if IsInitializationComplete() returns true. |
76 virtual PrefReadError GetReadError() const = 0; | 72 virtual PrefReadError GetReadError() const = 0; |
77 | 73 |
78 // Reads the preferences from disk. Notifies observers via | 74 // Reads the preferences from disk. Notifies observers via |
79 // "PrefStore::OnInitializationCompleted" when done. | 75 // "PrefStore::OnInitializationCompleted" when done. |
80 virtual PrefReadError ReadPrefs() = 0; | 76 virtual PrefReadError ReadPrefs() = 0; |
81 | 77 |
82 // Reads the preferences from disk asynchronously. Notifies observers via | 78 // Reads the preferences from disk asynchronously. Notifies observers via |
83 // "PrefStore::OnInitializationCompleted" when done. Also it fires | 79 // "PrefStore::OnInitializationCompleted" when done. Also it fires |
84 // |error_delegate| if it is not NULL and reading error has occurred. | 80 // |error_delegate| if it is not NULL and reading error has occurred. |
85 // Owns |error_delegate|. | 81 // Owns |error_delegate|. |
86 virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0; | 82 virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0; |
87 | 83 |
88 // Lands any pending writes to disk. | 84 // Lands any pending writes to disk. |
89 virtual void CommitPendingWrite() = 0; | 85 virtual void CommitPendingWrite() = 0; |
90 | 86 |
91 protected: | 87 protected: |
92 virtual ~PersistentPrefStore() {} | 88 virtual ~PersistentPrefStore() {} |
93 }; | 89 }; |
94 | 90 |
95 #endif // BASE_PREFS_PERSISTENT_PREF_STORE_H_ | 91 #endif // BASE_PREFS_PERSISTENT_PREF_STORE_H_ |
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