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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MINIKIN_LOCALE_LIST_CACHE_H
#define MINIKIN_LOCALE_LIST_CACHE_H
#include <mutex>
#include <unordered_map>
#include "minikin/Buffer.h"
#include "minikin/Macros.h"
#include "Locale.h"
namespace minikin {
class LocaleListCache {
public:
// A special ID for the invalid locale list.
const static uint32_t kInvalidListId = (uint32_t)(-1);
// Returns the locale list ID for the given string representation of LocaleList.
static inline uint32_t getId(const std::string& locales) {
return getInstance().getIdInternal(locales);
}
// Returns the locale list ID for the LocaleList serialized in the buffer.
static inline uint32_t readFrom(BufferReader* reader) {
return getInstance().readFromInternal(reader);
}
static inline void writeTo(BufferWriter* writer, uint32_t id) {
return getInstance().writeToInternal(writer, id);
}
static inline const LocaleList& getById(uint32_t id) {
return getInstance().getByIdInternal(id);
}
private:
struct LocaleVectorHash {
size_t operator()(const std::vector<Locale>& locales) const;
};
LocaleListCache(); // Singleton
~LocaleListCache() {}
uint32_t getIdInternal(const std::string& locales);
uint32_t getIdInternal(std::vector<Locale>&& locales) EXCLUSIVE_LOCKS_REQUIRED(mMutex);
uint32_t readFromInternal(BufferReader* reader);
void writeToInternal(BufferWriter* writer, uint32_t id);
const LocaleList& getByIdInternal(uint32_t id);
// Caller should acquire a lock before calling the method.
static LocaleListCache& getInstance() {
static LocaleListCache instance;
return instance;
}
std::vector<LocaleList> mLocaleLists GUARDED_BY(mMutex);
// A map from the list of locale identifier to the ID.
//
// Locale's operator==() doesn't have reflexivity for unsupported locales,
// but it won't cause problems because we never store unsupported locales in
// LocaleListCache. See parseLocaleList() in LocaleListCache.cpp.
std::unordered_map<std::vector<Locale>, uint32_t, LocaleVectorHash> mLocaleListLookupTable
GUARDED_BY(mMutex);
// A cache map from the string representation of the font locale list to the ID.
// This is a mere cache over mLocaleListLookupTable. Some LocaleList objects may be in
// mLocaleListLookupTable even if they are not in mLocaleListStringCache.
std::unordered_map<std::string, uint32_t> mLocaleListStringCache GUARDED_BY(mMutex);
std::mutex mMutex;
};
} // namespace minikin
#endif // MINIKIN_LOCALE_LIST_CACHE_H
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