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

third_party/libaddressinput/chromium/cpp/src/country_rules_aggregator.h

+// Copyright (C) 2014 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.
+
+#ifndef I18N_ADDRESSINPUT_COUNTRY_RULES_AGGREGATOR_H_
+#define I18N_ADDRESSINPUT_COUNTRY_RULES_AGGREGATOR_H_
+
+#include <libaddressinput/callback.h>
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace i18n {
+namespace addressinput {
+
+class Retriever;
+class Ruleset;
+
+// Aggregates a ruleset for a country. Sample usage:
+//    class MyClass {
+//     public:
+//      MyClass() : aggregator_(scoped_ptr<const Retriever>(...)) {}
+//
+//      ~MyClass() {}
+//
+//      void GetRuleset(const std::string& country_code) {
+//        aggregator_.AggregateRules(
+//            country_code,
+//            BuildScopedPtrCallback(this, &MyClass::OnRulesetReady));
+//      }
+//
+//      void OnRulesetReady(bool success,
+//                          const std::string& country_code,
+//                          scoped_ptr<Ruleset> ruleset) {
+//        ...
+//      }
+//
+//     private:
+//      CountryRulesAggregator aggregator_;
+//
+//      DISALLOW_COPY_AND_ASSIGN(MyClass);
+//    };
+class CountryRulesAggregator {
+ public:
+  typedef i18n::addressinput::ScopedPtrCallback<std::string, Ruleset> Callback;
+
+  explicit CountryRulesAggregator(scoped_ptr<Retriever> retriever);
+  ~CountryRulesAggregator();
+
+  // Recursively retrieves all of the rules for |country_code| and its
+  // administrative areas, localities, and dependent localities. Also retrieves
+  // the language-specific rules. Abandons previous requests if invoked multiple
+  // times. Invokes the |rules_ready| callback when finished.
+  void AggregateRules(const std::string& country_code,
+                      scoped_ptr<Callback> rules_ready);
+
+ private:
+  struct RequestData;
+
+  // Callback for Retriever::Retrieve() method.
+  void OnDataReady(bool success,
+                   const std::string& key,
+                   const std::string& data);
+
+  // Abandons all requests and clears all retrieved data.
+  void Reset();
+
+  // The data retriever that can download serialized rules for one sub-region at
+  // a time.
+  scoped_ptr<Retriever> retriever_;
+
+  // A mapping of data keys (e.g., "data/CA/AB--fr") to information that helps
+  // to parse the response data and place it the correct location in the
+  // rulesets.
+  std::map<std::string, RequestData> requests_;
+
+  // The country code for which to retrieve the ruleset. Passed to the callback
+  // method to identify the ruleset. Examples: "US", "CA", "CH", etc.
+  std::string country_code_;
+
+  // The callback to invoke when the ruleset has been retrieved.
+  scoped_ptr<Callback> rules_ready_;
+
+  // The top-level ruleset for the country code. Passed to the callback method
+  // as the result of the query.
+  scoped_ptr<Ruleset> root_;
+
+  // The default language for the country code. This value is parsed from the
+  // country-level rule for the country code and is used to filter out the
+  // default language from the list of all supported languages for a country.
+  // For example, the list of supported languages for Canada is ["en", "fr"],
+  // but the default language is "en". Data requests for "data/CA/AB--fr" will
+  // succeed, but "data/CA/AB--en" will not return data.
+  std::string default_language_;
+
+  // The list of all supported languages for the country code. This value is
+  // parsed from the country-level rule for the country and is used to download
+  // language-specific rules.
+  std::vector<std::string> languages_;
+
+  DISALLOW_COPY_AND_ASSIGN(CountryRulesAggregator);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_COUNTRY_RULES_AGGREGATOR_H_