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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2012 Peng Wu <alexepico@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <assert.h>
#include <string.h>
#include "phrase_large_table2.h"
/* class definition */
namespace pinyin{
class PhraseLengthIndexLevel2{
protected:
GArray * m_phrase_array_indexes;
public:
PhraseLengthIndexLevel2();
~PhraseLengthIndexLevel2();
/* load/store method */
bool load(MemoryChunk * chunk, table_offset_t offset, table_offset_t end);
bool store(MemoryChunk * new_chunk, table_offset_t offset, table_offset_t & end);
/* search method */
int search(int phrase_length, /* in */ ucs4_t phrase[],
/* out */ PhraseTokens tokens) const;
/* add_index/remove_index method */
int add_index(int phrase_length, /* in */ ucs4_t phrase[],
/* in */ phrase_token_t token);
int remove_index(int phrase_length, /* in */ ucs4_t phrase[],
/* in */ phrase_token_t token);
};
template<size_t phrase_length>
struct PhraseIndexItem2{
phrase_token_t m_token;
ucs4_t m_phrase[phrase_length];
public:
PhraseIndexItem2<phrase_length>(ucs4_t phrase[], phrase_token_t token){
memmove(m_phrase, phrase, sizeof(ucs4_t) * phrase_length);
m_token = token;
}
};
template<size_t phrase_length>
class PhraseArrayIndexLevel2{
protected:
typedef PhraseIndexItem2<phrase_length> IndexItem;
protected:
MemoryChunk m_chunk;
public:
bool load(MemoryChunk * chunk, table_offset_t offset, table_offset_t end);
bool store(MemoryChunk * new_chunk, table_offset_t offset, table_offset_t & end);
/* search method */
int search(/* in */ ucs4_t phrase[], /* out */ PhraseTokens tokens) const;
/* add_index/remove_index method */
int add_index(/* in */ ucs4_t phrase[], /* in */ phrase_token_t token);
int remove_index(/* in */ ucs4_t phrase[], /* in */ phrase_token_t token);
};
};
using namespace pinyin;
/* class implementation */
template<size_t phrase_length>
static int phrase_compare(const PhraseIndexItem2<phrase_length> &lhs,
const PhraseIndexItem2<phrase_length> &rhs){
ucs4_t * phrase_lhs = (ucs4_t *) lhs.m_phrase;
ucs4_t * phrase_rhs = (ucs4_t *) rhs.m_phrase;
return memcmp(phrase_lhs, phrase_rhs, sizeof(ucs4_t) * phrase_length);
}
template<size_t phrase_length>
static bool phrase_less_than(const PhraseIndexItem2<phrase_length> & lhs,
const PhraseIndexItem2<phrase_length> & rhs){
return 0 > phrase_compare(lhs, rhs);
}
PhraseBitmapIndexLevel2::PhraseBitmapIndexLevel2(){
memset(m_phrase_length_indexes, 0, sizeof(m_phrase_length_indexes));
}
void PhraseBitmapIndexLevel2::reset(){
for ( size_t i = 0; i < PHRASE_NUMBER_OF_BITMAP_INDEX; i++){
PhraseLengthIndexLevel2 * length_array =
m_phrase_length_indexes[i];
if ( length_array )
delete length_array;
}
}
int PhraseBitmapIndexLevel2::search(int phrase_length,
/* in */ ucs4_t phrase[],
/* out */ PhraseTokens tokens) const {
assert(phrase_length > 0);
int result = SEARCH_NONE;
/* use the first 8-bit of the lower 16-bit for bitmap index,
* as most the higher 16-bit are zero.
*/
guint8 first_key = (phrase[0] & 0xFF00) >> 8;
PhraseLengthIndexLevel2 * phrase_array = m_phrase_length_indexes[first_key];
if ( phrase_array )
return phrase_array->search(phrase_length, phrase, tokens);
return result;
}
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