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#ifndef MOZC_CONVERTER_SPARSE_CONNECTOR_H_
#define MOZC_CONVERTER_SPARSE_CONNECTOR_H_

#include <string>
#include "base/base.h"
#include "converter/connector_interface.h"

namespace mozc {

class SparseArrayImage;

class SparseConnector : public ConnectorInterface {
 public:
  SparseConnector(const char *ptr, size_t size);
  virtual ~SparseConnector();

  // magic number for SparseConnector image.
  static const uint16 kSparseConnectorMagic = 0x4141;
  // Special cost number to denote kInvalidCost for 1 byte cost encoding
  // mode.
  static const uint8 kInvalid1ByteCostValue = 255;

  virtual int GetTransitionCost(uint16 rid, uint16 lid) const;
  virtual int GetResolution() const;

  // It is better to store rid in higher bit as loop for rid is outside
  // of lid loop.
  inline static uint32 EncodeKey(int lid, int rid) {
    return (rid << 16) + lid;
  }

 private:
  scoped_ptr<SparseArrayImage> array_image_;
  const int16 *default_cost_;
  // Resolution of cost value. This value should be 1 for 2bytes cost mode.
  int resolution_;

  DISALLOW_COPY_AND_ASSIGN(SparseConnector);
};

class SparseConnectorBuilder {
 public:
  static void Compile(const string &text_connection_file,
                      const string &id_file,
                      const string &special_pos_file,
                      const string &bnary_file);
};
}  // mozc

#endif  // MOZC_CONVERTER_SPARSE_CONNECTOR_H_