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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2013 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.
*/
#ifndef NGRAM_BDB_H
#define NGRAM_BDB_H
#include <db.h>
namespace pinyin{
class SingleGram;
/**
* Bigram:
*
* The Bi-gram class.
*
*/
class Bigram{
private:
DB * m_db;
void reset();
public:
/**
* Bigram::Bigram:
*
* The constructor of the Bigram.
*
*/
Bigram();
/**
* Bigram::~Bigram:
*
* The destructor of the Bigram.
*
*/
~Bigram();
/**
* 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.
* @copy: whether copy content to the single gram.
* @returns: whether the load operation is successful.
*
* Load the single gram of the previous token.
*
*/
bool load(/* in */ phrase_token_t index,
/* out */ SingleGram * & single_gram, bool copy=false);
/**
* 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.
*
*/
bool store(/* in */ phrase_token_t index,
/* in */ SingleGram * single_gram);
/**
* Bigram::remove:
* @index: the previous token in the bi-gram.
* @returns: whether the remove operation is successful.
*
* Remove the single gram of the previous token.
*
*/
bool remove(/* in */ phrase_token_t index);
/**
* 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);
/**
* Bigram::mask_out:
* @mask: the mask.
* @value: the value.
* @returns: whether the mask out operation is successful.
*
* Mask out the matched items.
*
*/
bool mask_out(phrase_token_t mask, phrase_token_t value);
};
};
#endif
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