libaddressinput: Add fallback data for US address validation.

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

 // 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,
@@ skipping 12 matching lines @@
 
 #include <map>
 #include <string>
 
 namespace i18n {
 namespace addressinput {
 
 class Downloader;
 class Storage;
 
-// Retrieves data. Sample usage:
+// Manages downloading data and caching it locally. Sample usage:
 //    Storage* storage = ...;
 //    Downloader* downloader = ...;
 //    Retriever retriever("https://i18napis.appspot.com/ssl-address/",
 //                        downloader, storage);
 //    retriever.Retrieve("data/CA/AB--fr",
 //                       BuildCallback(this, &MyClass::OnDataRetrieved));
 class Retriever {
  public:
   typedef i18n::addressinput::Callback<std::string, std::string> Callback;
 
   Retriever(const std::string& validation_data_url,
             scoped_ptr<Downloader> downloader,
             scoped_ptr<Storage> storage);
   ~Retriever();
 
   // Retrieves the data for |key| and invokes the |retrieved| callback. Checks
   // for the data in storage first. If storage does not have the data for |key|,
   // then downloads the data and places it in storage.
   void Retrieve(const std::string& key, scoped_ptr<Callback> retrieved);
 
  private:
   friend class RetrieverTest;
 
   // Callback for when a rule is retrieved from |storage_|.
   void OnDataRetrievedFromStorage(bool success,
                                   const std::string& key,
-                                  const std::string& data);
+                                  const std::string& stored_data);
 
   // Callback for when a rule is retrieved by |downloader_|.
   void OnDownloaded(bool success,
                     const std::string& url,
-                    const std::string& data);
+                    const std::string& downloaded_data);
 
   // Returns the URL where the |key| can be retrieved. For example, returns
   // "https://i18napis.appspot.com/ssl-address/data/US" for input "data/US".
   // Assumes that the input string is a valid URL segment.
   std::string GetUrlForKey(const std::string& key) const;
 
   // Returns the key for the |url|. For example, returns "data/US" for
   // "https://i18napis.appspot.com/ssl-address/data/US". If the |url| does not
   // start with |validation_data_url| that was passed to the constructor, then
   // returns an empty string. (This can happen if the user of the library
@@ skipping 14 matching lines @@
   // Holds pending requests. The callback pointers are owned.
   std::map<std::string, Callback*> requests_;
 
   DISALLOW_COPY_AND_ASSIGN(Retriever);
 };
 
 }  // namespace addressinput
 }  // namespace i18n
 
 #endif  // I18N_ADDRESSINPUT_RETRIEVER_H_