1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/prefs/overlay_persistent_pref_store.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
OverlayPersistentPrefStore::OverlayPersistentPrefStore(
PersistentPrefStore* underlay)
: underlay_(underlay) {
underlay_->AddObserver(this);
}
OverlayPersistentPrefStore::~OverlayPersistentPrefStore() {
underlay_->RemoveObserver(this);
}
bool OverlayPersistentPrefStore::IsSetInOverlay(const std::string& key) const {
return overlay_.GetValue(key, NULL);
}
void OverlayPersistentPrefStore::AddObserver(PrefStore::Observer* observer) {
observers_.AddObserver(observer);
}
void OverlayPersistentPrefStore::RemoveObserver(PrefStore::Observer* observer) {
observers_.RemoveObserver(observer);
}
bool OverlayPersistentPrefStore::IsInitializationComplete() const {
return underlay_->IsInitializationComplete();
}
PrefStore::ReadResult OverlayPersistentPrefStore::GetValue(
const std::string& key,
const Value** result) const {
if (overlay_.GetValue(key, result))
return READ_OK;
return underlay_->GetValue(key, result);
}
PrefStore::ReadResult OverlayPersistentPrefStore::GetMutableValue(
const std::string& key,
Value** result) {
if (overlay_.GetValue(key, result))
return READ_OK;
// Try to create copy of underlay if the overlay does not contain a value.
Value* underlay_value = NULL;
PrefStore::ReadResult read_result =
underlay_->GetMutableValue(key, &underlay_value);
if (read_result == READ_OK) {
*result = underlay_value->DeepCopy();
overlay_.SetValue(key, *result);
return READ_OK;
}
// Return read failure if underlay stores no value for |key|.
return read_result;
}
void OverlayPersistentPrefStore::SetValue(const std::string& key,
Value* value) {
if (overlay_.SetValue(key, value))
FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
}
void OverlayPersistentPrefStore::SetValueSilently(const std::string& key,
Value* value) {
overlay_.SetValue(key, value);
}
void OverlayPersistentPrefStore::RemoveValue(const std::string& key) {
if (overlay_.RemoveValue(key))
FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
}
bool OverlayPersistentPrefStore::ReadOnly() const {
return false;
}
PersistentPrefStore::PrefReadError OverlayPersistentPrefStore::ReadPrefs() {
// We do not read intentionally.
OnInitializationCompleted(true);
return PersistentPrefStore::PREF_READ_ERROR_NONE;
}
void OverlayPersistentPrefStore::ReadPrefsAsync(
ReadErrorDelegate* error_delegate_raw) {
scoped_ptr<ReadErrorDelegate> error_delegate(error_delegate_raw);
// We do not read intentionally.
OnInitializationCompleted(true);
}
bool OverlayPersistentPrefStore::WritePrefs() {
// We do not write intentionally.
return true;
}
void OverlayPersistentPrefStore::ScheduleWritePrefs() {
// We do not write intentionally.
}
void OverlayPersistentPrefStore::CommitPendingWrite() {
// We do not write intentionally.
}
void OverlayPersistentPrefStore::ReportValueChanged(const std::string& key) {
FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
}
void OverlayPersistentPrefStore::OnPrefValueChanged(const std::string& key) {
if (!overlay_.GetValue(key, NULL))
FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
}
void OverlayPersistentPrefStore::OnInitializationCompleted(bool succeeded) {
FOR_EACH_OBSERVER(PrefStore::Observer, observers_,
OnInitializationCompleted(succeeded));
}
|
