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Side by Side Diff: chrome/browser/prefs/pref_value_store.cc

Issue 12211105: Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Address review comments, merge to LKGR. Created 7 years, 10 months ago
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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
3 // found in the LICENSE file.
4
5 #include "chrome/browser/prefs/pref_value_store.h"
6
7 #include "base/logging.h"
8 #include "base/prefs/pref_notifier.h"
9 #include "base/prefs/pref_observer.h"
10
11 PrefValueStore::PrefStoreKeeper::PrefStoreKeeper()
12 : pref_value_store_(NULL),
13 type_(PrefValueStore::INVALID_STORE) {
14 }
15
16 PrefValueStore::PrefStoreKeeper::~PrefStoreKeeper() {
17 if (pref_store_.get()) {
18 pref_store_->RemoveObserver(this);
19 pref_store_ = NULL;
20 }
21 pref_value_store_ = NULL;
22 }
23
24 void PrefValueStore::PrefStoreKeeper::Initialize(
25 PrefValueStore* store,
26 PrefStore* pref_store,
27 PrefValueStore::PrefStoreType type) {
28 if (pref_store_.get()) {
29 pref_store_->RemoveObserver(this);
30 DCHECK_EQ(0U, pref_store_->NumberOfObservers());
31 }
32 type_ = type;
33 pref_value_store_ = store;
34 pref_store_ = pref_store;
35 if (pref_store_.get())
36 pref_store_->AddObserver(this);
37 }
38
39 void PrefValueStore::PrefStoreKeeper::OnPrefValueChanged(
40 const std::string& key) {
41 pref_value_store_->OnPrefValueChanged(type_, key);
42 }
43
44 void PrefValueStore::PrefStoreKeeper::OnInitializationCompleted(
45 bool succeeded) {
46 pref_value_store_->OnInitializationCompleted(type_, succeeded);
47 }
48
49 PrefValueStore::PrefValueStore(PrefStore* managed_prefs,
50 PrefStore* extension_prefs,
51 PrefStore* command_line_prefs,
52 PrefStore* user_prefs,
53 PrefStore* recommended_prefs,
54 PrefStore* default_prefs,
55 PrefNotifier* pref_notifier)
56 : pref_notifier_(pref_notifier),
57 initialization_failed_(false) {
58 InitPrefStore(MANAGED_STORE, managed_prefs);
59 InitPrefStore(EXTENSION_STORE, extension_prefs);
60 InitPrefStore(COMMAND_LINE_STORE, command_line_prefs);
61 InitPrefStore(USER_STORE, user_prefs);
62 InitPrefStore(RECOMMENDED_STORE, recommended_prefs);
63 InitPrefStore(DEFAULT_STORE, default_prefs);
64
65 CheckInitializationCompleted();
66 }
67
68 PrefValueStore::~PrefValueStore() {}
69
70 PrefValueStore* PrefValueStore::CloneAndSpecialize(
71 PrefStore* managed_prefs,
72 PrefStore* extension_prefs,
73 PrefStore* command_line_prefs,
74 PrefStore* user_prefs,
75 PrefStore* recommended_prefs,
76 PrefStore* default_prefs,
77 PrefNotifier* pref_notifier) {
78 DCHECK(pref_notifier);
79 if (!managed_prefs)
80 managed_prefs = GetPrefStore(MANAGED_STORE);
81 if (!extension_prefs)
82 extension_prefs = GetPrefStore(EXTENSION_STORE);
83 if (!command_line_prefs)
84 command_line_prefs = GetPrefStore(COMMAND_LINE_STORE);
85 if (!user_prefs)
86 user_prefs = GetPrefStore(USER_STORE);
87 if (!recommended_prefs)
88 recommended_prefs = GetPrefStore(RECOMMENDED_STORE);
89 if (!default_prefs)
90 default_prefs = GetPrefStore(DEFAULT_STORE);
91
92 return new PrefValueStore(
93 managed_prefs, extension_prefs, command_line_prefs, user_prefs,
94 recommended_prefs, default_prefs, pref_notifier);
95 }
96
97 void PrefValueStore::set_callback(const PrefChangedCallback& callback) {
98 pref_changed_callback_ = callback;
99 }
100
101 bool PrefValueStore::GetValue(const std::string& name,
102 base::Value::Type type,
103 const Value** out_value) const {
104 // Check the |PrefStore|s in order of their priority from highest to lowest,
105 // looking for the first preference value with the given |name| and |type|.
106 for (size_t i = 0; i <= PREF_STORE_TYPE_MAX; ++i) {
107 if (GetValueFromStoreWithType(name.c_str(), type,
108 static_cast<PrefStoreType>(i), out_value))
109 return true;
110 }
111 return false;
112 }
113
114 bool PrefValueStore::GetRecommendedValue(const std::string& name,
115 base::Value::Type type,
116 const Value** out_value) const {
117 return GetValueFromStoreWithType(name.c_str(), type, RECOMMENDED_STORE,
118 out_value);
119 }
120
121 void PrefValueStore::NotifyPrefChanged(
122 const char* path,
123 PrefValueStore::PrefStoreType new_store) {
124 DCHECK(new_store != INVALID_STORE);
125 // A notification is sent when the pref value in any store changes. If this
126 // store is currently being overridden by a higher-priority store, the
127 // effective value of the pref will not have changed.
128 pref_notifier_->OnPreferenceChanged(path);
129 if (!pref_changed_callback_.is_null())
130 pref_changed_callback_.Run(path);
131 }
132
133 bool PrefValueStore::PrefValueInManagedStore(const char* name) const {
134 return PrefValueInStore(name, MANAGED_STORE);
135 }
136
137 bool PrefValueStore::PrefValueInExtensionStore(const char* name) const {
138 return PrefValueInStore(name, EXTENSION_STORE);
139 }
140
141 bool PrefValueStore::PrefValueInUserStore(const char* name) const {
142 return PrefValueInStore(name, USER_STORE);
143 }
144
145 bool PrefValueStore::PrefValueFromExtensionStore(const char* name) const {
146 return ControllingPrefStoreForPref(name) == EXTENSION_STORE;
147 }
148
149 bool PrefValueStore::PrefValueFromUserStore(const char* name) const {
150 return ControllingPrefStoreForPref(name) == USER_STORE;
151 }
152
153 bool PrefValueStore::PrefValueFromRecommendedStore(const char* name) const {
154 return ControllingPrefStoreForPref(name) == RECOMMENDED_STORE;
155 }
156
157 bool PrefValueStore::PrefValueFromDefaultStore(const char* name) const {
158 return ControllingPrefStoreForPref(name) == DEFAULT_STORE;
159 }
160
161 bool PrefValueStore::PrefValueUserModifiable(const char* name) const {
162 PrefStoreType effective_store = ControllingPrefStoreForPref(name);
163 return effective_store >= USER_STORE ||
164 effective_store == INVALID_STORE;
165 }
166
167 bool PrefValueStore::PrefValueExtensionModifiable(const char* name) const {
168 PrefStoreType effective_store = ControllingPrefStoreForPref(name);
169 return effective_store >= EXTENSION_STORE ||
170 effective_store == INVALID_STORE;
171 }
172
173 void PrefValueStore::UpdateCommandLinePrefStore(PrefStore* command_line_prefs) {
174 InitPrefStore(COMMAND_LINE_STORE, command_line_prefs);
175 }
176
177 bool PrefValueStore::PrefValueInStore(
178 const char* name,
179 PrefValueStore::PrefStoreType store) const {
180 // Declare a temp Value* and call GetValueFromStore,
181 // ignoring the output value.
182 const Value* tmp_value = NULL;
183 return GetValueFromStore(name, store, &tmp_value);
184 }
185
186 bool PrefValueStore::PrefValueInStoreRange(
187 const char* name,
188 PrefValueStore::PrefStoreType first_checked_store,
189 PrefValueStore::PrefStoreType last_checked_store) const {
190 if (first_checked_store > last_checked_store) {
191 NOTREACHED();
192 return false;
193 }
194
195 for (size_t i = first_checked_store;
196 i <= static_cast<size_t>(last_checked_store); ++i) {
197 if (PrefValueInStore(name, static_cast<PrefStoreType>(i)))
198 return true;
199 }
200 return false;
201 }
202
203 PrefValueStore::PrefStoreType PrefValueStore::ControllingPrefStoreForPref(
204 const char* name) const {
205 for (size_t i = 0; i <= PREF_STORE_TYPE_MAX; ++i) {
206 if (PrefValueInStore(name, static_cast<PrefStoreType>(i)))
207 return static_cast<PrefStoreType>(i);
208 }
209 return INVALID_STORE;
210 }
211
212 bool PrefValueStore::GetValueFromStore(const char* name,
213 PrefValueStore::PrefStoreType store_type,
214 const Value** out_value) const {
215 // Only return true if we find a value and it is the correct type, so stale
216 // values with the incorrect type will be ignored.
217 const PrefStore* store = GetPrefStore(static_cast<PrefStoreType>(store_type));
218 if (store && store->GetValue(name, out_value))
219 return true;
220
221 // No valid value found for the given preference name: set the return value
222 // to false.
223 *out_value = NULL;
224 return false;
225 }
226
227 bool PrefValueStore::GetValueFromStoreWithType(const char* name,
228 base::Value::Type type,
229 PrefStoreType store,
230 const Value** out_value) const {
231 if (GetValueFromStore(name, store, out_value)) {
232 if ((*out_value)->IsType(type))
233 return true;
234
235 LOG(WARNING) << "Expected type for " << name << " is " << type
236 << " but got " << (*out_value)->GetType()
237 << " in store " << store;
238 }
239
240 *out_value = NULL;
241 return false;
242 }
243
244 void PrefValueStore::OnPrefValueChanged(PrefValueStore::PrefStoreType type,
245 const std::string& key) {
246 NotifyPrefChanged(key.c_str(), type);
247 }
248
249 void PrefValueStore::OnInitializationCompleted(
250 PrefValueStore::PrefStoreType type, bool succeeded) {
251 if (initialization_failed_)
252 return;
253 if (!succeeded) {
254 initialization_failed_ = true;
255 pref_notifier_->OnInitializationCompleted(false);
256 return;
257 }
258 CheckInitializationCompleted();
259 }
260
261 void PrefValueStore::InitPrefStore(PrefValueStore::PrefStoreType type,
262 PrefStore* pref_store) {
263 pref_stores_[type].Initialize(this, pref_store, type);
264 }
265
266 void PrefValueStore::CheckInitializationCompleted() {
267 if (initialization_failed_)
268 return;
269 for (size_t i = 0; i <= PREF_STORE_TYPE_MAX; ++i) {
270 scoped_refptr<PrefStore> store =
271 GetPrefStore(static_cast<PrefStoreType>(i));
272 if (store && !store->IsInitializationComplete())
273 return;
274 }
275 pref_notifier_->OnInitializationCompleted(true);
276 }
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