1 // Copyright (C) 2013 Google Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // The interface to be implemented by the user of the library to access address 16 // metadata, typically by downloading this from the address metadata server or 17 // by linking the metadata into the binary. 18 19 #ifndef I18N_ADDRESSINPUT_SOURCE_H_ 20 #define I18N_ADDRESSINPUT_SOURCE_H_ 21 22 #include <libaddressinput/callback.h> 23 24 #include <string> 25 26 namespace i18n { 27 namespace addressinput { 28 29 // Gets address metadata. The callback data must be allocated on the heap, 30 // passing ownership to the callback. Sample usage: 31 // 32 // class MySource : public Source { 33 // public: 34 // virtual void Get(const std::string& key, 35 // const Callback& data_ready) const { 36 // bool success = ... 37 // std::string* data = new ... 38 // data_ready(success, key, data); 39 // } 40 // }; 41 class Source { 42 public: 43 typedef i18n::addressinput::Callback<const std::string&, 44 std::string*> Callback; 45 ~Source()46 virtual ~Source() {} 47 48 // Gets metadata for |key| and invokes the |data_ready| callback. 49 virtual void Get(const std::string& key, 50 const Callback& data_ready) const = 0; 51 }; 52 53 } // namespace addressinput 54 } // namespace i18n 55 56 #endif // I18N_ADDRESSINPUT_SOURCE_H_ 57