text: // 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.
  //
  // It is not always desirable to cache libaddressinput data. Sometimes it might
  // give better performance characteristics to not cache. This implementation of
  // the Storage interface therefore doesn't actually store anything.
  
  #ifndef I18N_ADDRESSINPUT_NULL_STORAGE_H_
  #define I18N_ADDRESSINPUT_NULL_STORAGE_H_
  
  #include <libaddressinput/storage.h>
  #include <libaddressinput/util/basictypes.h>
  
  #include <string>
  
  namespace i18n {
  namespace addressinput {
  
  class NullStorage : public Storage {
   public:
    NullStorage();
    virtual ~NullStorage();
  
    // No-op.
    virtual void Put(const std::string& key, std::string* data);
  
    // Always calls the |data_ready| callback function signalling failure.
    virtual void Get(const std::string& key, const Callback& data_ready) const;
  
   private:
    DISALLOW_COPY_AND_ASSIGN(NullStorage);
  };
  
  }  // namespace addressinput
  }  // namespace i18n
  
  #endif  // I18N_ADDRESSINPUT_NULL_STORAGE_H_
  