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#ifndef FLEXIBLE_NGRAM_H
#define FLEXIBLE_NGRAM_H
/* Note: the signature of the template parameters.
* struct MagicHeader, ArrayHeader, ArrayItem.
*/
typedef GArray * FlexibleBigramPhraseArray;
template<typename ArrayHeader, typename ArrayItem>
class FlexibleSingleGram{
template<typename MagicHeader, typename ArrayHeader,
typename ArrayItem>
friend class FlexibleBigram;
private:
MemoryChunk m_chunk;
FlexibleSingleGram(void * buffer, size_t length);
public:
/* Null Constructor */
FlexibleSingleGram();
/* retrieve all items */
bool retrieve_all(/* out */ FlexibleBigramPhraseArray array);
/* search method */
/* the array result contains many items */
bool search(/* in */ PhraseIndexRange * range,
/* out */ FlexibleBigramPhraseArray array);
/* get array item */
bool get_array_item(/* in */ phrase_token_t token,
/* out */ ArrayItem & item);
/* set array item */
bool set_array_item(/* in */ phrase_token_t token,
/* in */ const ArrayItem & item);
/* get array header */
bool get_array_header(/* out */ ArrayHeader & header);
/* set array header */
bool set_array_header(/* in */ const ArrayHeader & header);
};
template<typename MagicHeader, typename ArrayHeader,
typename ArrayItem>
class FlexibleBigram{
private:
DB * m_db;
void reset(){
if ( m_db ){
m_db->close(m_db, 0);
m_db = NULL;
}
}
public:
FlexibleBigram(){
m_db = NULL;
}
~FlexibleBigram(){
reset();
}
/* attach berkeley db on filesystem for training purpose. */
bool attach(const char * dbfile);
/* load/store one array. */
bool load(phrase_token_t index,
FlexibleSingleGram<ArrayHeader, ArrayItem> * & single_gram);
bool store(phrase_token_t index, FlexibleSingleGram * & single_gram);
/* array of phrase_token_t items, for parameter estimation. */
bool get_all_items(GArray * items);
};
#endif
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