concordia-library/concordia/hash_generator.cpp

#include "concordia/hash_generator.hpp"
#include "concordia/common/utils.hpp"
#include "concordia/token_annotation.hpp"

#include <boost/filesystem.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/foreach.hpp>

#include <fstream>

HashGenerator::HashGenerator(std::string indexPath,
                             boost::shared_ptr<ConcordiaConfig> config)
                                         throw(ConcordiaException) :
    _wordMapFilePath(indexPath+"/"+WORD_MAP_FILE_NAME),
    _wordMap(boost::shared_ptr<WordMap>(new WordMap)),
    _sentenceTokenizer(boost::shared_ptr<SentenceTokenizer>(
                                    new SentenceTokenizer(config))) {
    if (boost::filesystem::exists(_wordMapFilePath)) {
        std::ifstream ifs(_wordMapFilePath.c_str(), std::ios::binary);
        boost::archive::binary_iarchive ia(ifs);
        boost::shared_ptr<WordMap> restoredWordMap(new WordMap);
        ia >> *_wordMap;
    }
}

HashGenerator::~HashGenerator() {
}

TokenizedSentence HashGenerator::generateHash(
                     const std::string & sentence,
                     bool byWhitespace) throw(ConcordiaException) {
    TokenizedSentence ts = _sentenceTokenizer->tokenize(sentence, byWhitespace);
    ts.generateHash(_wordMap);

    if (ts.getTokens().size() > Utils::maxSentenceSize) {
        throw ConcordiaException("Trying to add too long sentence.");
    }

    return ts;
}

void HashGenerator::serializeWordMap() {
    std::ofstream ofs(_wordMapFilePath.c_str(), std::ios::binary);
    boost::archive::binary_oarchive oa(ofs);
    oa << *_wordMap;
}

void HashGenerator::clearWordMap() {
    _wordMap = boost::shared_ptr<WordMap>(new WordMap);
    boost::filesystem::remove(_wordMapFilePath);
}