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/* Copyright (C) 2010 webis.de
 * All rights reserved.
 */
#ifndef AITOOLS_INVERTEDINDEX_MP_HASH_FUNCTION_HPP
#define AITOOLS_INVERTEDINDEX_MP_HASH_FUNCTION_HPP

#include "Externalizable.hpp"
#include "Vocabulary.hpp"
#include <string>
#include <cmph.h>

namespace bfs = boost::filesystem;

namespace aitools {
namespace invertedindex {

class MPHashFunction : public Externalizable {

public: // nested types

        enum Algorithm
        {
                BMZ, CHM, BRZ, FCH, BDZ, CHD
        };

public: // c'tor / d'tor

        MPHashFunction();

        ~MPHashFunction();

public: // methods

        void create(const bfs::path& vocabulary, Algorithm algorithm = BDZ)
        throw (std::invalid_argument, std::runtime_error);

        void create(const Vocabulary& vocabulary, Algorithm algorithm = BDZ)
        throw (std::runtime_error);

        uint32_t hash(const std::string& key) const;

        void load(const bfs::path& path) throw (std::invalid_argument);

        void save(const bfs::path& path) throw (std::invalid_argument);

        uint32_t size() const;

private: // methods

        void clear_();
        void create_(Algorithm algorithm, cmph_io_adapter_t* source)
        throw (std::runtime_error);

private: // data

        cmph_t* mphf_;

};

} // namespace invertedindex
} // namespace aitools

#endif // AITOOLS_INVERTEDINDEX_MP_HASH_FUNCTION_HPP

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