1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MINIKIN_LOCALE_LIST_CACHE_H 18 #define MINIKIN_LOCALE_LIST_CACHE_H 19 20 #include <mutex> 21 #include <unordered_map> 22 23 #include "minikin/Macros.h" 24 25 #include "Locale.h" 26 27 namespace minikin { 28 29 class LocaleListCache { 30 public: 31 // A special ID for the empty locale list. 32 // This value must be 0 since the empty locale list is inserted into mLocaleLists by 33 // default. 34 const static uint32_t kEmptyListId = 0; 35 36 // A special ID for the invalid locale list. 37 const static uint32_t kInvalidListId = (uint32_t)(-1); 38 39 // Returns the locale list ID for the given string representation of LocaleList. 40 // Caller should acquire a lock before calling the method. getId(const std::string & locales)41 static inline uint32_t getId(const std::string& locales) { 42 return getInstance().getIdInternal(locales); 43 } 44 45 // Caller should acquire a lock before calling the method. getById(uint32_t id)46 static inline const LocaleList& getById(uint32_t id) { 47 return getInstance().getByIdInternal(id); 48 } 49 50 private: 51 LocaleListCache(); // Singleton ~LocaleListCache()52 ~LocaleListCache() {} 53 54 uint32_t getIdInternal(const std::string& locales); 55 const LocaleList& getByIdInternal(uint32_t id); 56 57 // Caller should acquire a lock before calling the method. getInstance()58 static LocaleListCache& getInstance() { 59 static LocaleListCache instance; 60 return instance; 61 } 62 63 std::vector<LocaleList> mLocaleLists GUARDED_BY(mMutex); 64 65 // A map from the string representation of the font locale list to the ID. 66 std::unordered_map<std::string, uint32_t> mLocaleListLookupTable GUARDED_BY(mMutex); 67 68 std::mutex mMutex; 69 }; 70 71 } // namespace minikin 72 73 #endif // MINIKIN_LOCALE_LIST_CACHE_H 74