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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2006-2007 Peng Wu
*
* 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.
*/
#ifndef NGRAM_H
#define NGRAM_H
#include <db.h>
namespace pinyin{
class Bigram;
/** Note:
* The system single gram contains the trained freqs.
* The user single gram contains the delta freqs.
* During the Viterbi beam search, use merge_single_gram to merge the system
* single gram and the user single gram.
*/
/**
* SingleGram:
*
* The single gram in the bi-gram.
*
*/
class SingleGram{
friend class Bigram;
friend bool merge_single_gram(SingleGram * merged,
const SingleGram * system,
const SingleGram * user);
private:
MemoryChunk m_chunk;
SingleGram(void * buffer, size_t length);
public:
/**
* SingleGram::SingleGram:
*
* The constructor of the SingleGram.
*
*/
SingleGram();
/**
* SingleGram::retrieve_all:
* @array: the GArray to store the retrieved bi-gram phrase item.
* @returns: whether the retrieve operation is successful.
*
* Retrieve all bi-gram phrase items in this single gram.
*
*/
bool retrieve_all(/* out */ BigramPhraseWithCountArray array) const;
/**
* SingleGram::search:
* @range: the token range.
* @array: the GArray to store the matched bi-gram phrase item.
* @returns: whether the search operation is successful.
*
* Search the bi-gram phrase items according to the token range.
*
* Note: the array result may contain many items.
*
*/
bool search(/* in */ PhraseIndexRange * range,
/* out */ BigramPhraseArray array) const;
/**
* SingleGram::insert_freq:
* @token: the phrase token.
* @freq: the freq of this token.
* @returns: whether the insert operation is successful.
*
* Insert the token with the freq.
*
*/
bool insert_freq(/* in */ phrase_token_t token,
/* in */ guint32 freq);
/**
* SingleGram::remove_freq:
* @token: the phrase token.
* @freq: the freq of the removed token.
* @returns: whether the remove operation is successful.
*
* Remove the token.
*
*/
bool remove_freq(/* in */ phrase_token_t token,
/* out */ guint32 & freq);
/**
* SingleGram::get_freq:
* @token: the phrase token.
* @freq: the freq of the token.
* @returns: whether the get operation is successful.
*
* Get the freq of the token.
*
*/
bool get_freq(/* in */ phrase_token_t token,
/* out */ guint32 & freq) const;
/**
* SingleGram::set_freq:
* @token: the phrase token.
* @freq: the freq of the token.
* @returns: whether the set operation is successful.
*
* Set the freq of the token.
*
*/
bool set_freq(/* in */ phrase_token_t token,
/* in */ guint32 freq);
/**
* SingleGram::get_total_freq:
* @total: the total freq of this single gram.
* @returns: whether the get operation is successful.
*
* Get the total freq of this single gram.
*
*/
bool get_total_freq(guint32 & total) const;
/**
* SingleGram::set_total_freq:
* @total: the total freq of this single gram.
* @returns: whether the set operation is successful.
*
* Set the total freq of this single gram.
*
*/
bool set_total_freq(guint32 total);
/**
* SingleGram::prune:
* @returns: whether the prune operation is successful.
*
* Obsoleted by Katz k mixture model pruning.
*
*/
bool prune();
};
/**
* Bigram:
*
* The Bi-gram class.
*
*/
class Bigram{
private:
DB * m_db;
void reset(){
if ( m_db ){
m_db->sync(m_db, 0);
m_db->close(m_db, 0);
m_db = NULL;
}
}
public:
/**
* Bigram::Bigram:
*
* The constructor of the Bigram.
*
*/
Bigram(){
m_db = NULL;
}
/**
* Bigram::~Bigram:
*
* The destructor of the Bigram.
*
*/
~Bigram(){
reset();
}
/**
* Bigram::load_db:
* @dbfile: the Berkeley DB file name.
* @returns: whether the load operation is successful.
*
* Load the Berkeley DB into memory.
*
*/
bool load_db(const char * dbfile);
/**
* Bigram::save_db:
* @dbfile: the Berkeley DB file name.
* @returns: whether the save operation is successful.
*
* Save the in-memory Berkeley DB into disk.
*
*/
bool save_db(const char * dbfile);
/**
* Bigram::attach:
* @dbfile: the Berkeley DB file name.
* @flags: the flags of enum ATTACH_FLAG.
* @returns: whether the attach operation is successful.
*
* Attach this Bigram with the Berkeley DB.
*
*/
bool attach(const char * dbfile, guint32 flags);
/**
* Bigram::load:
* @index: the previous token in the bi-gram.
* @single_gram: the single gram of the previous token.
* @returns: whether the load operation is successful.
*
* Load the single gram of the previous token into the SingleGram class.
*
*/
bool load(/* in */ phrase_token_t index,
/* out */ SingleGram * & single_gram);
/**
* Bigram::store:
* @index: the previous token in the bi-gram.
* @single_gram: the single gram of the previous token.
* @returns: whether the store operation is successful.
*
* Store the single gram of the previous token from the SingleGram class.
*
*/
bool store(/* in */ phrase_token_t index,
/* in */ SingleGram * single_gram);
/**
* Bigram::get_all_items:
* @items: the GArray to store all previous tokens.
* @returns: whether the get operation is successful.
*
* Get the array of all previous tokens for parameter estimation.
*
*/
bool get_all_items(/* out */ GArray * items);
};
/**
* merge_single_gram:
* @merged: the merged single gram of system and user single gram.
* @system: the system single gram to be merged.
* @user: the user single gram to be merged.
* @returns: whether the merge operation is successful.
*
* Merge the system and user single gram into one merged single gram.
*
* Note: Please keep system and user single gram
* when using merged single gram.
*
*/
bool merge_single_gram(SingleGram * merged, const SingleGram * system,
const SingleGram * user);
};
#endif
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