vocabulary_map.h

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#ifndef META_VOCABULARY_MAP_H_
#define META_VOCABULARY_MAP_H_

#include "io/mmap_file.h"
#include "util/disk_vector.h"

namespace meta
{
namespace util
{
template <class>
class optional;
}
}

namespace meta
{
namespace index
{

class vocabulary_map
{
  private:
    io::mmap_file file_;

    util::disk_vector<uint64_t> inverse_;

    uint64_t block_size_;

    uint64_t leaf_end_pos_;

    uint64_t initial_seek_pos_;

    int compare(const std::string& term, const char* other) const;

  public:
    vocabulary_map(const std::string& path, uint16_t block_size = 4096);

    vocabulary_map(vocabulary_map&&) = default;

    vocabulary_map& operator=(vocabulary_map&&) = default;

    util::optional<term_id> find(const std::string& term) const;

    std::string find_term(term_id t_id) const;

    uint64_t size() const;
};
}
}

#endif