/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MINIKIN_LOCALE_LIST_CACHE_H
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#define MINIKIN_LOCALE_LIST_CACHE_H
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#include <mutex>
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#include <unordered_map>
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#include "minikin/Macros.h"
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#include "Locale.h"
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namespace minikin {
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class LocaleListCache {
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public:
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// A special ID for the empty locale list.
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// This value must be 0 since the empty locale list is inserted into mLocaleLists by
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// default.
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const static uint32_t kEmptyListId = 0;
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// A special ID for the invalid locale list.
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const static uint32_t kInvalidListId = (uint32_t)(-1);
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// Returns the locale list ID for the given string representation of LocaleList.
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// Caller should acquire a lock before calling the method.
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static inline uint32_t getId(const std::string& locales) {
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return getInstance().getIdInternal(locales);
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}
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// Caller should acquire a lock before calling the method.
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static inline const LocaleList& getById(uint32_t id) {
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return getInstance().getByIdInternal(id);
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}
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private:
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LocaleListCache(); // Singleton
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~LocaleListCache() {}
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uint32_t getIdInternal(const std::string& locales);
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const LocaleList& getByIdInternal(uint32_t id);
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// Caller should acquire a lock before calling the method.
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static LocaleListCache& getInstance() {
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static LocaleListCache instance;
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return instance;
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}
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std::vector<LocaleList> mLocaleLists GUARDED_BY(mMutex);
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// A map from the string representation of the font locale list to the ID.
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std::unordered_map<std::string, uint32_t> mLocaleListLookupTable GUARDED_BY(mMutex);
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std::mutex mMutex;
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};
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} // namespace minikin
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#endif // MINIKIN_LOCALE_LIST_CACHE_H
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