PART1: Initiated the SignedSettings refactoring.

chrome/browser/chromeos/cros_settings.cc

 // 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/chromeos/cros_settings.h"
 
 #include "base/lazy_instance.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/values.h"
-#include "chrome/browser/chromeos/cros_settings_provider.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
+#include "chrome/browser/chromeos/proxy_cros_settings_provider.h"
 #include "chrome/browser/chromeos/user_cros_settings_provider.h"
+#include "chrome/browser/policy/browser_policy_connector.h"
+#include "chrome/browser/ui/webui/options/chromeos/system_settings_provider.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/common/content_notification_types.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_source.h"
 
 namespace chromeos {
 
+namespace {
+
+// Create a settings value with "managed" and "disabled" property.
+// "managed" property is true if the setting is managed by administrator.
+// "disabled" property is true if the UI for the setting should be disabled.
+base::Value* CreateSettingsValue(base::Value *value,
+                                 bool managed,
+                                 bool disabled) {

[Mattias Nissler (ping if slow), 2011/09/26 17:26:37]

As commented in reply to a previous comment, can't we just move this to the UI
code?

[pastarmovj, 2011/09/29 15:15:03]

Done.

+  DictionaryValue* dict = new DictionaryValue;
+  dict->Set("value", value);
+  dict->Set("managed", Value::CreateBooleanValue(managed));
+  dict->Set("disabled", Value::CreateBooleanValue(disabled));
+  return dict;
+}
+
+}  // namespace
+
 static base::LazyInstance<CrosSettings> g_cros_settings(
     base::LINKER_INITIALIZED);
 
 CrosSettings* CrosSettings::Get() {
   // TODO(xiyaun): Use real stuff when underlying libcros is ready.
   return g_cros_settings.Pointer();
 }
 
 bool CrosSettings::IsCrosSettings(const std::string& path) {
   return StartsWithASCII(path, kCrosSettingsPrefix, true);
@@ skipping 109 matching lines @@
     return;
   }
 
   NotificationObserverList* observer_list = observer_iterator->second;
   observer_list->RemoveObserver(obs);
 }
 
 CrosSettingsProvider* CrosSettings::GetProvider(
     const std::string& path) const {
   for (size_t i = 0; i < providers_.size(); ++i) {
-    if (providers_[i]->HandlesSetting(path)) {
+    if (providers_[i]->HandlesSetting(path))
       return providers_[i];
-    }
   }
   return NULL;
 }
 
+const base::Value* CrosSettings::GetPref(const std::string& path) const {
+  DCHECK(CalledOnValidThread());
+  CrosSettingsProvider* provider;
+  provider = GetProvider(path);
+  if (provider)
+    return provider->Get(path);
+  NOTREACHED() << path << " preference was not found in the signed settings.";
+  return NULL;
+}
+
 bool CrosSettings::Get(const std::string& path, Value** out_value) const {
   DCHECK(CalledOnValidThread());
+  const Value* pref_value = GetPref(path);
+  if (pref_value) {
+    *out_value = CreateSettingsValue(
+        pref_value->DeepCopy(),
+        g_browser_process->browser_policy_connector()->IsEnterpriseManaged(),
+        !UserManager::Get()->current_user_is_owner());
+    return true;
+  }
+  return false;
+}
+
+bool CrosSettings::GetTrusted(
+    const std::string& path,
+    const base::Closure& callback) const {
+  DCHECK(CalledOnValidThread());
   CrosSettingsProvider* provider;
   provider = GetProvider(path);
-  if (provider) {
-    return provider->Get(path, out_value);
-  }
+  if (provider)
+    return provider->GetTrusted(path, callback);
+  NOTREACHED() << "CrosSettings::GetTrusted called for unknown pref : " << path;
   return false;
 }
 
 bool CrosSettings::GetBoolean(const std::string& path,
                               bool* bool_value) const {
   DCHECK(CalledOnValidThread());
-  Value* value;
-  if (!Get(path, &value))
-    return false;
-
-  return value->GetAsBoolean(bool_value);
+  const Value* value = GetPref(path);
+  if (value)
+    return value->GetAsBoolean(bool_value);
+  return false;
 }
 
 bool CrosSettings::GetInteger(const std::string& path,
                               int* out_value) const {
   DCHECK(CalledOnValidThread());
-  Value* value;
-  if (!Get(path, &value))
-    return false;
-
-  return value->GetAsInteger(out_value);
+  const Value* value = GetPref(path);
+  if (value)
+    return value->GetAsInteger(out_value);
+  return false;
 }
 
 bool CrosSettings::GetDouble(const std::string& path,
                              double* out_value) const {
   DCHECK(CalledOnValidThread());
-  Value* value;
-  if (!Get(path, &value))
-    return false;
-
-  return value->GetAsDouble(out_value);
+  const Value* value = GetPref(path);
+  if (value)
+    return value->GetAsDouble(out_value);
+  return false;
 }
 
 bool CrosSettings::GetString(const std::string& path,
                              std::string* out_value) const {
   DCHECK(CalledOnValidThread());
-  Value* value;
-  if (!Get(path, &value))
-    return false;
+  const Value* value = GetPref(path);
+  if (value)
+    return value->GetAsString(out_value);
+  return false;
+}
 
-  return value->GetAsString(out_value);
+bool CrosSettings::GetList(const std::string& path,
+                           const base::ListValue** out_value) const {
+  DCHECK(CalledOnValidThread());
+  const Value* value = GetPref(path);
+  if (value)
+    return value->GetAsList(out_value);
+  return false;
 }
 
 CrosSettings::CrosSettings() {
+  AddSettingsProvider(new ProxyCrosSettingsProvider());
+  AddSettingsProvider(new SystemSettingsProvider());
+  AddSettingsProvider(new UserCrosSettingsProvider());
 }
 
 CrosSettings::~CrosSettings() {
-  DCHECK(providers_.empty());
-  STLDeleteValues(&settings_observers_);
+  STLDeleteElements(&providers_);
 }
 
 }  // namespace chromeos