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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 CHROME_COMMON_PREF_STORE_H_ | 5 #ifndef CHROME_COMMON_PREF_STORE_H_ |
6 #define CHROME_COMMON_PREF_STORE_H_ | 6 #define CHROME_COMMON_PREF_STORE_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <string> | 9 #include <string> |
10 | 10 |
11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
12 #include "base/memory/ref_counted.h" | 12 #include "base/memory/ref_counted.h" |
13 | 13 |
14 namespace base { | 14 namespace base { |
15 class Value; | 15 class Value; |
16 } | 16 } |
17 | 17 |
18 // This is an abstract interface for reading and writing from/to a persistent | 18 // This is an abstract interface for reading and writing from/to a persistent |
19 // preference store, used by PrefService. An implementation using a JSON file | 19 // preference store, used by PrefService. An implementation using a JSON file |
20 // can be found in JsonPrefStore, while an implementation without any backing | 20 // can be found in JsonPrefStore, while an implementation without any backing |
21 // store for testing can be found in TestingPrefStore. Furthermore, there is | 21 // store for testing can be found in TestingPrefStore. Furthermore, there is |
22 // CommandLinePrefStore, which bridges command line options to preferences and | 22 // CommandLinePrefStore, which bridges command line options to preferences and |
23 // ConfigurationPolicyPrefStore, which is used for hooking up configuration | 23 // ConfigurationPolicyPrefStore, which is used for hooking up configuration |
24 // policy with the preference subsystem. | 24 // policy with the preference subsystem. |
25 class PrefStore : public base::RefCounted<PrefStore> { | 25 class PrefStore : public base::RefCounted<PrefStore> { |
26 public: | 26 public: |
27 // Observer interface for monitoring PrefStore. | 27 // Observer interface for monitoring PrefStore. |
28 class Observer { | 28 class Observer { |
29 public: | 29 public: |
30 virtual ~Observer() {} | |
31 | |
32 // Called when the value for the given |key| in the store changes. | 30 // Called when the value for the given |key| in the store changes. |
33 virtual void OnPrefValueChanged(const std::string& key) = 0; | 31 virtual void OnPrefValueChanged(const std::string& key) = 0; |
34 // Notification about the PrefStore being fully initialized. | 32 // Notification about the PrefStore being fully initialized. |
35 virtual void OnInitializationCompleted(bool succeeded) = 0; | 33 virtual void OnInitializationCompleted(bool succeeded) = 0; |
| 34 |
| 35 protected: |
| 36 virtual ~Observer() {} |
36 }; | 37 }; |
37 | 38 |
38 // Return values for GetValue(). | 39 // Return values for GetValue(). |
39 enum ReadResult { | 40 enum ReadResult { |
40 // Value found and returned. | 41 // Value found and returned. |
41 READ_OK, | 42 READ_OK, |
42 // No value present, but skip other pref stores and use default. | 43 // No value present, but skip other pref stores and use default. |
43 READ_USE_DEFAULT, | 44 READ_USE_DEFAULT, |
44 // No value present. | 45 // No value present. |
45 READ_NO_VALUE, | 46 READ_NO_VALUE, |
(...skipping 17 matching lines...) Expand all Loading... |
63 | 64 |
64 protected: | 65 protected: |
65 friend class base::RefCounted<PrefStore>; | 66 friend class base::RefCounted<PrefStore>; |
66 virtual ~PrefStore() {} | 67 virtual ~PrefStore() {} |
67 | 68 |
68 private: | 69 private: |
69 DISALLOW_COPY_AND_ASSIGN(PrefStore); | 70 DISALLOW_COPY_AND_ASSIGN(PrefStore); |
70 }; | 71 }; |
71 | 72 |
72 #endif // CHROME_COMMON_PREF_STORE_H_ | 73 #endif // CHROME_COMMON_PREF_STORE_H_ |
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