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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 "base/prefs/public/pref_member.h" | |
6 | |
7 #include "base/bind_helpers.h" | |
8 #include "base/callback.h" | |
9 #include "base/location.h" | |
10 #include "base/prefs/pref_service.h" | |
11 #include "base/value_conversions.h" | |
12 | |
13 using base::MessageLoopProxy; | |
14 | |
15 namespace subtle { | |
16 | |
17 PrefMemberBase::PrefMemberBase() | |
18 : prefs_(NULL), | |
19 setting_value_(false) { | |
20 } | |
21 | |
22 PrefMemberBase::~PrefMemberBase() { | |
23 Destroy(); | |
24 } | |
25 | |
26 void PrefMemberBase::Init(const char* pref_name, | |
27 PrefService* prefs, | |
28 const NamedChangeCallback& observer) { | |
29 observer_ = observer; | |
30 Init(pref_name, prefs); | |
31 } | |
32 | |
33 void PrefMemberBase::Init(const char* pref_name, | |
34 PrefService* prefs) { | |
35 DCHECK(pref_name); | |
36 DCHECK(prefs); | |
37 DCHECK(pref_name_.empty()); // Check that Init is only called once. | |
38 prefs_ = prefs; | |
39 pref_name_ = pref_name; | |
40 // Check that the preference is registered. | |
41 DCHECK(prefs_->FindPreference(pref_name_.c_str())) | |
42 << pref_name << " not registered."; | |
43 | |
44 // Add ourselves as a pref observer so we can keep our local value in sync. | |
45 prefs_->AddPrefObserver(pref_name, this); | |
46 } | |
47 | |
48 void PrefMemberBase::Destroy() { | |
49 if (prefs_ && !pref_name_.empty()) { | |
50 prefs_->RemovePrefObserver(pref_name_.c_str(), this); | |
51 prefs_ = NULL; | |
52 } | |
53 } | |
54 | |
55 void PrefMemberBase::MoveToThread( | |
56 const scoped_refptr<MessageLoopProxy>& message_loop) { | |
57 VerifyValuePrefName(); | |
58 // Load the value from preferences if it hasn't been loaded so far. | |
59 if (!internal()) | |
60 UpdateValueFromPref(base::Closure()); | |
61 internal()->MoveToThread(message_loop); | |
62 } | |
63 | |
64 void PrefMemberBase::OnPreferenceChanged(PrefService* service, | |
65 const std::string& pref_name) { | |
66 VerifyValuePrefName(); | |
67 UpdateValueFromPref((!setting_value_ && !observer_.is_null()) ? | |
68 base::Bind(observer_, pref_name) : base::Closure()); | |
69 } | |
70 | |
71 void PrefMemberBase::UpdateValueFromPref(const base::Closure& callback) const { | |
72 VerifyValuePrefName(); | |
73 const PrefService::Preference* pref = | |
74 prefs_->FindPreference(pref_name_.c_str()); | |
75 DCHECK(pref); | |
76 if (!internal()) | |
77 CreateInternal(); | |
78 internal()->UpdateValue(pref->GetValue()->DeepCopy(), | |
79 pref->IsManaged(), | |
80 pref->IsUserModifiable(), | |
81 callback); | |
82 } | |
83 | |
84 void PrefMemberBase::VerifyPref() const { | |
85 VerifyValuePrefName(); | |
86 if (!internal()) | |
87 UpdateValueFromPref(base::Closure()); | |
88 } | |
89 | |
90 void PrefMemberBase::InvokeUnnamedCallback(const base::Closure& callback, | |
91 const std::string& pref_name) { | |
92 callback.Run(); | |
93 } | |
94 | |
95 PrefMemberBase::Internal::Internal() | |
96 : thread_loop_(MessageLoopProxy::current()), | |
97 is_managed_(false) { | |
98 } | |
99 PrefMemberBase::Internal::~Internal() { } | |
100 | |
101 bool PrefMemberBase::Internal::IsOnCorrectThread() const { | |
102 // In unit tests, there may not be a message loop. | |
103 return thread_loop_ == NULL || thread_loop_->BelongsToCurrentThread(); | |
104 } | |
105 | |
106 void PrefMemberBase::Internal::UpdateValue( | |
107 base::Value* v, | |
108 bool is_managed, | |
109 bool is_user_modifiable, | |
110 const base::Closure& callback) const { | |
111 scoped_ptr<base::Value> value(v); | |
112 base::ScopedClosureRunner closure_runner(callback); | |
113 if (IsOnCorrectThread()) { | |
114 bool rv = UpdateValueInternal(*value); | |
115 DCHECK(rv); | |
116 is_managed_ = is_managed; | |
117 is_user_modifiable_ = is_user_modifiable; | |
118 } else { | |
119 bool may_run = thread_loop_->PostTask( | |
120 FROM_HERE, | |
121 base::Bind(&PrefMemberBase::Internal::UpdateValue, this, | |
122 value.release(), is_managed, is_user_modifiable, | |
123 closure_runner.Release())); | |
124 DCHECK(may_run); | |
125 } | |
126 } | |
127 | |
128 void PrefMemberBase::Internal::MoveToThread( | |
129 const scoped_refptr<MessageLoopProxy>& message_loop) { | |
130 CheckOnCorrectThread(); | |
131 thread_loop_ = message_loop; | |
132 } | |
133 | |
134 bool PrefMemberVectorStringUpdate(const base::Value& value, | |
135 std::vector<std::string>* string_vector) { | |
136 if (!value.IsType(base::Value::TYPE_LIST)) | |
137 return false; | |
138 const ListValue* list = static_cast<const ListValue*>(&value); | |
139 | |
140 std::vector<std::string> local_vector; | |
141 for (ListValue::const_iterator it = list->begin(); it != list->end(); ++it) { | |
142 std::string string_value; | |
143 if (!(*it)->GetAsString(&string_value)) | |
144 return false; | |
145 | |
146 local_vector.push_back(string_value); | |
147 } | |
148 | |
149 string_vector->swap(local_vector); | |
150 return true; | |
151 } | |
152 | |
153 } // namespace subtle | |
154 | |
155 template <> | |
156 void PrefMember<bool>::UpdatePref(const bool& value) { | |
157 prefs()->SetBoolean(pref_name().c_str(), value); | |
158 } | |
159 | |
160 template <> | |
161 bool PrefMember<bool>::Internal::UpdateValueInternal( | |
162 const base::Value& value) const { | |
163 return value.GetAsBoolean(&value_); | |
164 } | |
165 | |
166 template <> | |
167 void PrefMember<int>::UpdatePref(const int& value) { | |
168 prefs()->SetInteger(pref_name().c_str(), value); | |
169 } | |
170 | |
171 template <> | |
172 bool PrefMember<int>::Internal::UpdateValueInternal( | |
173 const base::Value& value) const { | |
174 return value.GetAsInteger(&value_); | |
175 } | |
176 | |
177 template <> | |
178 void PrefMember<double>::UpdatePref(const double& value) { | |
179 prefs()->SetDouble(pref_name().c_str(), value); | |
180 } | |
181 | |
182 template <> | |
183 bool PrefMember<double>::Internal::UpdateValueInternal(const base::Value& value) | |
184 const { | |
185 return value.GetAsDouble(&value_); | |
186 } | |
187 | |
188 template <> | |
189 void PrefMember<std::string>::UpdatePref(const std::string& value) { | |
190 prefs()->SetString(pref_name().c_str(), value); | |
191 } | |
192 | |
193 template <> | |
194 bool PrefMember<std::string>::Internal::UpdateValueInternal( | |
195 const base::Value& value) | |
196 const { | |
197 return value.GetAsString(&value_); | |
198 } | |
199 | |
200 template <> | |
201 void PrefMember<base::FilePath>::UpdatePref(const base::FilePath& value) { | |
202 prefs()->SetFilePath(pref_name().c_str(), value); | |
203 } | |
204 | |
205 template <> | |
206 bool PrefMember<base::FilePath>::Internal::UpdateValueInternal( | |
207 const base::Value& value) | |
208 const { | |
209 return base::GetValueAsFilePath(value, &value_); | |
210 } | |
211 | |
212 template <> | |
213 void PrefMember<std::vector<std::string> >::UpdatePref( | |
214 const std::vector<std::string>& value) { | |
215 ListValue list_value; | |
216 list_value.AppendStrings(value); | |
217 prefs()->Set(pref_name().c_str(), list_value); | |
218 } | |
219 | |
220 template <> | |
221 bool PrefMember<std::vector<std::string> >::Internal::UpdateValueInternal( | |
222 const base::Value& value) const { | |
223 return subtle::PrefMemberVectorStringUpdate(value, &value_); | |
224 } | |
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