1 /* 2 * Copyright (C) 2018 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 LIBTEXTCLASSIFIER_UTILS_RESOURCES_H_ 18 #define LIBTEXTCLASSIFIER_UTILS_RESOURCES_H_ 19 20 #include <vector> 21 22 #include "utils/i18n/language-tag_generated.h" 23 #include "utils/i18n/locale.h" 24 #include "utils/resources_generated.h" 25 #include "utils/strings/stringpiece.h" 26 27 namespace libtextclassifier3 { 28 29 // Class for accessing localized model resources. 30 class Resources { 31 public: Resources(const ResourcePool * resources)32 explicit Resources(const ResourcePool* resources) : resources_(resources) {} 33 34 // Returns the string value associated with the particular resource. 35 // `locales` are locales in preference order. 36 bool GetResourceContent(const std::vector<Locale>& locales, 37 const StringPiece resource_name, 38 std::string* result) const; 39 40 private: 41 // Match priorities: language > script > region with wildcard matches being 42 // weaker than an exact match. 43 // For a resource lookup, at least language needs to (weakly) match. 44 // c.f. developer.android.com/guide/topics/resources/multilingual-support 45 enum LocaleMatch { 46 LOCALE_NO_MATCH = 0, 47 LOCALE_REGION_WILDCARD_MATCH = 1 << 0, 48 LOCALE_REGION_MATCH = 1 << 1, 49 LOCALE_SCRIPT_WILDCARD_MATCH = 1 << 2, 50 LOCALE_SCRIPT_MATCH = 1 << 3, 51 LOCALE_LANGUAGE_WILDCARD_MATCH = 1 << 4, 52 LOCALE_LANGUAGE_MATCH = 1 << 5 53 }; 54 int LocaleMatch(const Locale& locale, const LanguageTag* entry_locale) const; 55 56 // Finds a resource entry by name. 57 const ResourceEntry* FindResource(const StringPiece resource_name) const; 58 59 // Finds the best locale matching resource from a resource entry. 60 int BestResourceForLocales(const ResourceEntry* resource, 61 const std::vector<Locale>& locales) const; 62 63 const ResourcePool* resources_; 64 }; 65 66 } // namespace libtextclassifier3 67 68 #endif // LIBTEXTCLASSIFIER_UTILS_RESOURCES_H_ 69