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_FONT_LANGUAGE_LIST_CACHE_H 18 #define MINIKIN_FONT_LANGUAGE_LIST_CACHE_H 19 20 #include <unordered_map> 21 22 #include <minikin/FontFamily.h> 23 #include "FontLanguage.h" 24 25 namespace minikin { 26 27 class FontLanguageListCache { 28 public: 29 // A special ID for the empty language list. 30 // This value must be 0 since the empty language list is inserted into 31 // mLanguageLists by default. 32 const static uint32_t kEmptyListId = 0; 33 34 // Returns language list ID for the given string representation of 35 // FontLanguages. Caller should acquire a lock before calling the method. 36 static uint32_t getId(const std::string& languages); 37 38 // Caller should acquire a lock before calling the method. 39 static const FontLanguages& getById(uint32_t id); 40 41 private: FontLanguageListCache()42 FontLanguageListCache() {} // Singleton ~FontLanguageListCache()43 ~FontLanguageListCache() {} 44 45 // Caller should acquire a lock before calling the method. 46 static FontLanguageListCache* getInstance(); 47 48 std::vector<FontLanguages> mLanguageLists; 49 50 // A map from string representation of the font language list to the ID. 51 std::unordered_map<std::string, uint32_t> mLanguageListLookupTable; 52 }; 53 54 } // namespace minikin 55 56 #endif // MINIKIN_FONT_LANGUAGE_LIST_CACHE_H 57