[rac] Download all rules for a country code in libaddressinput.

third_party/libaddressinput/chromium/cpp/src/rule.cc

 // Copyright (C) 2013 Google Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 // http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "rule.h"
 
 #include <libaddressinput/address_field.h>
 #include <libaddressinput/util/scoped_ptr.h>
 
 #include <map>
 #include <string>
 #include <utility>
 
 #include "address_field_util.h"
 #include "grit.h"
 #include "messages.h"
+#include "region_data_constants.h"
 #include "util/json.h"
 #include "util/string_split.h"
 
 namespace i18n {
 namespace addressinput {
 
 namespace {
 
 typedef std::map<std::string, int> NameMessageIdMap;
 
@@ skipping 54 matching lines @@
       InitPostalCodeMessageIds());
   return kPostalCodeMessageIds;
 }
 
 int GetMessageIdFromName(const std::string& name,
                          const NameMessageIdMap& message_ids) {
   NameMessageIdMap::const_iterator it = message_ids.find(name);
   return it != message_ids.end() ? it->second : INVALID_MESSAGE_ID;
 }
 
+// Parses the default region data into the static Rule object and returns a
+// constant reference to this object. Cannot return a copy of the object,
+// because Rule objects are not copyable.
+const Rule& InitDefaultRule() {
+  static Rule rule;
+  rule.ParseSerializedRule(RegionDataConstants::GetDefaultRegionData());
+  return rule;
+}
+
 }  // namespace
 
 Rule::Rule()
     : format_(),
       sub_keys_(),
       languages_(),
       language_(),
       admin_area_name_message_id_(INVALID_MESSAGE_ID),
       postal_code_name_message_id_(INVALID_MESSAGE_ID) {}
 
 Rule::~Rule() {}
 
+// static
+const Rule& Rule::GetDefault() {
+  // Returns the constant reference to the Rule object from InitDefaultRule().
+  // The static object is in InitDefaultRule(), but this function maintains a
+  // constant static reference to it. The constant static reference avoids
+  // re-parsing the default region data.
+  static const Rule& kDefaultRule(InitDefaultRule());
+  return kDefaultRule;
+}
+
 void Rule::CopyFrom(const Rule& rule) {
   format_ = rule.format_;
   sub_keys_ = rule.sub_keys_;
   languages_ = rule.languages_;
   language_ = rule.language_;
   admin_area_name_message_id_ = rule.admin_area_name_message_id_;
   postal_code_name_message_id_ = rule.postal_code_name_message_id_;
 }
 
 bool Rule::ParseSerializedRule(const std::string& serialized_rule) {
@@ skipping 30 matching lines @@
     postal_code_name_message_id_ =
         GetMessageIdFromName(json->GetStringValueForKey(kPostalCodeNameTypeKey),
                              GetPostalCodeMessageIds());
   }
 
   return true;
 }
 
 }  // namespace addressinput
 }  // namespace i18n