[rAc - libaddressinput] slay a Helper class.

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,
 // 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.
 //
 // An object to retrieve data.
 
 #ifndef I18N_ADDRESSINPUT_RETRIEVER_H_
 #define I18N_ADDRESSINPUT_RETRIEVER_H_
 
 #include <libaddressinput/callback.h>
 #include <libaddressinput/util/basictypes.h>
 #include <libaddressinput/util/scoped_ptr.h>
 
+#include <map>
 #include <string>
 
 #include "lookup_key_util.h"
 
 namespace i18n {
 namespace addressinput {
 
 class Downloader;
 class Storage;
 
 // Retrieves data. 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<const 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) const;
+  void Retrieve(const std::string& key, scoped_ptr<Callback> retrieved);
 
  private:
+  // Callback for when a rule is retrieved from |storage_|.
+  void OnDataRetrievedFromStorage(bool success,
+                                  const std::string& key,
+                                  const std::string& data);
+
+  // Callback for when a rule is retrieved by |downloader_|.
+  void OnDownloaded(bool success,
+                    const std::string& url,
+                    const std::string& data);
+
+  // Looks up the callback for |key| in |requests_|, removes it from the map
+  // and returns it. Assumes that |key| is in fact in |requests_|.
+  scoped_ptr<Callback> GetCallbackForKey(const std::string& key);
+
   const LookupKeyUtil lookup_key_util_;
   scoped_ptr<const Downloader> downloader_;
   scoped_ptr<Storage> storage_;
+  // 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_