Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/prefs/pref_registry_syncable.cc

+// 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 "chrome/browser/prefs/pref_registry_syncable.h"
+
+#include "base/file_path.h"
+#include "base/string_number_conversions.h"
+#include "base/values.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace {
+
+// A helper function for RegisterLocalized*Pref that creates a Value*
+// based on a localized resource.  Because we control the values in a
+// locale dll, this should always return a Value of the appropriate
+// type.
+base::Value* CreateLocaleDefaultValue(base::Value::Type type,
+                                      int message_id) {
+  const std::string& resource_string = l10n_util::GetStringUTF8(message_id);
+  DCHECK(!resource_string.empty());
+  switch (type) {
+    case Value::TYPE_BOOLEAN: {
+      if ("true" == resource_string)
+        return Value::CreateBooleanValue(true);
+      if ("false" == resource_string)
+        return Value::CreateBooleanValue(false);
+      break;
+    }
+
+    case Value::TYPE_INTEGER: {
+      int val;
+      base::StringToInt(resource_string, &val);
+      return Value::CreateIntegerValue(val);
+    }
+
+    case Value::TYPE_DOUBLE: {
+      double val;
+      base::StringToDouble(resource_string, &val);
+      return Value::CreateDoubleValue(val);
+    }
+
+    case Value::TYPE_STRING: {
+      return Value::CreateStringValue(resource_string);
+    }
+
+    default: {
+      NOTREACHED() <<
+          "list and dictionary types cannot have default locale values";
+    }
+  }
+  NOTREACHED();
+  return Value::CreateNullValue();
+}
+
+}  // namespace
+
+PrefRegistrySyncable::PrefRegistrySyncable() {
+}
+
+PrefRegistrySyncable::~PrefRegistrySyncable() {
+}
+
+void PrefRegistrySyncable::RegisterBooleanPref(const char* path,
+                                               bool default_value,
+                                               PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path,
+                             Value::CreateBooleanValue(default_value),
+                             sync_status);
+}
+
+void PrefRegistrySyncable::RegisterIntegerPref(const char* path,
+                                               int default_value,
+                                               PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path,
+                             Value::CreateIntegerValue(default_value),
+                             sync_status);
+}
+
+void PrefRegistrySyncable::RegisterDoublePref(const char* path,
+                                              double default_value,
+                                              PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path,
+                             Value::CreateDoubleValue(default_value),
+                             sync_status);
+}
+
+void PrefRegistrySyncable::RegisterStringPref(const char* path,
+                                              const std::string& default_value,
+                                              PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path,
+                             Value::CreateStringValue(default_value),
+                             sync_status);
+}
+
+void PrefRegistrySyncable::RegisterFilePathPref(const char* path,
+                                                const FilePath& default_value,
+                                                PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path,
+                             Value::CreateStringValue(default_value.value()),
+                             sync_status);
+}
+
+void PrefRegistrySyncable::RegisterListPref(const char* path,
+                                            PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path, new ListValue(), sync_status);
+}
+
+void PrefRegistrySyncable::RegisterListPref(const char* path,
+                                            ListValue* default_value,
+                                            PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path, default_value, sync_status);
+}
+
+void PrefRegistrySyncable::RegisterDictionaryPref(const char* path,
+                                                  PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path, new DictionaryValue(), sync_status);
+}
+
+void PrefRegistrySyncable::RegisterDictionaryPref(
+    const char* path,
+    DictionaryValue* default_value,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(path, default_value, sync_status);
+}
+
+void PrefRegistrySyncable::RegisterLocalizedBooleanPref(
+    const char* path,
+    int locale_default_message_id,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      CreateLocaleDefaultValue(Value::TYPE_BOOLEAN, locale_default_message_id),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterLocalizedIntegerPref(
+    const char* path,
+    int locale_default_message_id,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      CreateLocaleDefaultValue(Value::TYPE_INTEGER, locale_default_message_id),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterLocalizedDoublePref(
+    const char* path,
+    int locale_default_message_id,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      CreateLocaleDefaultValue(Value::TYPE_DOUBLE, locale_default_message_id),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterLocalizedStringPref(
+    const char* path,
+    int locale_default_message_id,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      CreateLocaleDefaultValue(Value::TYPE_STRING, locale_default_message_id),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterInt64Pref(
+    const char* path,
+    int64 default_value,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      Value::CreateStringValue(base::Int64ToString(default_value)),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterUint64Pref(
+    const char* path,
+    uint64 default_value,
+    PrefSyncStatus sync_status) {
+  RegisterSyncablePreference(
+      path,
+      Value::CreateStringValue(base::Uint64ToString(default_value)),
+      sync_status);
+}
+
+void PrefRegistrySyncable::RegisterSyncablePreference(
+    const char* path,
+    base::Value* default_value,
+    PrefSyncStatus sync_status) {

[Mattias Nissler (ping if slow), 2013/01/31 15:30:19]

Some thoughts here: We were thinking of splitting the syncable stuff away from
PrefService entirely and drive PrefModelAssociator via pref change notifications
like everything else. When we do that, we might consider getting rid of
PrefServiceSyncable as well, keep the name-to-syncable-flag-map here in
PrefRegistrySyncable and pass the PrefRegistrySyncable reference to
PrefModelAssociator at construction time.

I haven't thought through all the details, but if this works out, it would
further modularize and simplify things.

+  PrefRegistry::RegisterPreference(path, default_value);
+
+  if (sync_status == SYNCABLE_PREF && !callback_.is_null())
+    callback_.Run(path);
+}