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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
// Copyright (c) 2012 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 "components/prefs/overlay_user_pref_store.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "base/values.h"
OverlayUserPrefStore::OverlayUserPrefStore(
PersistentPrefStore* underlay)
: underlay_(underlay) {
underlay_->AddObserver(this);
}
bool OverlayUserPrefStore::IsSetInOverlay(const std::string& key) const {
return overlay_.GetValue(key, NULL);
}
void OverlayUserPrefStore::AddObserver(PrefStore::Observer* observer) {
observers_.AddObserver(observer);
}
void OverlayUserPrefStore::RemoveObserver(PrefStore::Observer* observer) {
observers_.RemoveObserver(observer);
}
bool OverlayUserPrefStore::HasObservers() const {
return observers_.might_have_observers();
}
bool OverlayUserPrefStore::IsInitializationComplete() const {
return underlay_->IsInitializationComplete();
}
bool OverlayUserPrefStore::GetValue(const std::string& key,
const base::Value** result) const {
// If the |key| shall NOT be stored in the overlay store, there must not
// be an entry.
DCHECK(ShallBeStoredInOverlay(key) || !overlay_.GetValue(key, NULL));
if (overlay_.GetValue(key, result))
return true;
return underlay_->GetValue(GetUnderlayKey(key), result);
}
bool OverlayUserPrefStore::GetMutableValue(const std::string& key,
base::Value** result) {
if (!ShallBeStoredInOverlay(key))
return underlay_->GetMutableValue(GetUnderlayKey(key), result);
if (overlay_.GetValue(key, result))
return true;
// Try to create copy of underlay if the overlay does not contain a value.
base::Value* underlay_value = NULL;
if (!underlay_->GetMutableValue(GetUnderlayKey(key), &underlay_value))
return false;
*result = underlay_value->DeepCopy();
overlay_.SetValue(key, base::WrapUnique(*result));
return true;
}
void OverlayUserPrefStore::SetValue(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->SetValue(GetUnderlayKey(key), std::move(value), flags);
return;
}
if (overlay_.SetValue(key, std::move(value)))
ReportValueChanged(key, flags);
}
void OverlayUserPrefStore::SetValueSilently(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->SetValueSilently(GetUnderlayKey(key), std::move(value), flags);
return;
}
overlay_.SetValue(key, std::move(value));
}
void OverlayUserPrefStore::RemoveValue(const std::string& key, uint32_t flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->RemoveValue(GetUnderlayKey(key), flags);
return;
}
if (overlay_.RemoveValue(key))
ReportValueChanged(key, flags);
}
bool OverlayUserPrefStore::ReadOnly() const {
return false;
}
PersistentPrefStore::PrefReadError OverlayUserPrefStore::GetReadError() const {
return PersistentPrefStore::PREF_READ_ERROR_NONE;
}
PersistentPrefStore::PrefReadError OverlayUserPrefStore::ReadPrefs() {
// We do not read intentionally.
OnInitializationCompleted(true);
return PersistentPrefStore::PREF_READ_ERROR_NONE;
}
void OverlayUserPrefStore::ReadPrefsAsync(
ReadErrorDelegate* error_delegate_raw) {
std::unique_ptr<ReadErrorDelegate> error_delegate(error_delegate_raw);
// We do not read intentionally.
OnInitializationCompleted(true);
}
void OverlayUserPrefStore::CommitPendingWrite() {
underlay_->CommitPendingWrite();
// We do not write our content intentionally.
}
void OverlayUserPrefStore::SchedulePendingLossyWrites() {
underlay_->SchedulePendingLossyWrites();
}
void OverlayUserPrefStore::ReportValueChanged(const std::string& key,
uint32_t flags) {
for (PrefStore::Observer& observer : observers_)
observer.OnPrefValueChanged(key);
}
void OverlayUserPrefStore::OnPrefValueChanged(const std::string& key) {
if (!overlay_.GetValue(GetOverlayKey(key), NULL))
ReportValueChanged(GetOverlayKey(key), DEFAULT_PREF_WRITE_FLAGS);
}
void OverlayUserPrefStore::OnInitializationCompleted(bool succeeded) {
for (PrefStore::Observer& observer : observers_)
observer.OnInitializationCompleted(succeeded);
}
void OverlayUserPrefStore::RegisterOverlayPref(const std::string& key) {
RegisterOverlayPref(key, key);
}
void OverlayUserPrefStore::RegisterOverlayPref(
const std::string& overlay_key,
const std::string& underlay_key) {
DCHECK(!overlay_key.empty()) << "Overlay key is empty";
DCHECK(overlay_to_underlay_names_map_.find(overlay_key) ==
overlay_to_underlay_names_map_.end()) <<
"Overlay key already registered";
DCHECK(!underlay_key.empty()) << "Underlay key is empty";
DCHECK(underlay_to_overlay_names_map_.find(underlay_key) ==
underlay_to_overlay_names_map_.end()) <<
"Underlay key already registered";
overlay_to_underlay_names_map_[overlay_key] = underlay_key;
underlay_to_overlay_names_map_[underlay_key] = overlay_key;
}
void OverlayUserPrefStore::ClearMutableValues() {
overlay_.Clear();
}
OverlayUserPrefStore::~OverlayUserPrefStore() {
underlay_->RemoveObserver(this);
}
const std::string& OverlayUserPrefStore::GetOverlayKey(
const std::string& underlay_key) const {
NamesMap::const_iterator i =
underlay_to_overlay_names_map_.find(underlay_key);
return i != underlay_to_overlay_names_map_.end() ? i->second : underlay_key;
}
const std::string& OverlayUserPrefStore::GetUnderlayKey(
const std::string& overlay_key) const {
NamesMap::const_iterator i =
overlay_to_underlay_names_map_.find(overlay_key);
return i != overlay_to_underlay_names_map_.end() ? i->second : overlay_key;
}
bool OverlayUserPrefStore::ShallBeStoredInOverlay(
const std::string& key) const {
return overlay_to_underlay_names_map_.find(key) !=
overlay_to_underlay_names_map_.end();
}
|
