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/*
* Copyright (C) 2009 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 PINYINIME_ANDPY_INCLUDE_LPICACHE_H__
#define PINYINIME_ANDPY_INCLUDE_LPICACHE_H__
#include <stdlib.h>
#include "./searchutility.h"
#include "./spellingtrie.h"
namespace ime_pinyin {
// Used to cache LmaPsbItem list for half spelling ids.
class LpiCache {
private:
static LpiCache *instance_;
static const int kMaxLpiCachePerId = 15;
LmaPsbItem *lpi_cache_;
uint16 *lpi_cache_len_;
public:
LpiCache();
~LpiCache();
static LpiCache& get_instance();
// Test if the LPI list of the given splid has been cached.
// If splid is a full spelling id, it returns false, because we only cache
// list for half ids.
bool is_cached(uint16 splid);
// Put LPI list to cahce. If the length of the list, lpi_num, is longer than
// the cache buffer. the list will be truncated, and function returns the
// maximum length of the cache buffer.
// Note: splid must be a half id, and lpi_items must be not NULL. The
// caller of this function should guarantee this.
size_t put_cache(uint16 splid, LmaPsbItem lpi_items[], size_t lpi_num);
// Get the cached list for the given half id.
// Return the length of the cached buffer.
// Note: splid must be a half id, and lpi_items must be not NULL. The
// caller of this function should guarantee this.
size_t get_cache(uint16 splid, LmaPsbItem lpi_items[], size_t lpi_max);
};
} // namespace
#endif // PINYINIME_ANDPY_INCLUDE_LPICACHE_H__
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