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#ifndef MOZC_CONVERTER_CONNECTOR_H_
#define MOZC_CONVERTER_CONNECTOR_H_
#include "base/base.h"
namespace mozc {
class ConnectorInterface {
public:
virtual int GetTransitionCost(uint16 rid, uint16 lid) const = 0;
// Test code can use this method to get acceptable error.
virtual int GetResolution() const = 0;
static const int16 kInvalidCost = 30000;
protected:
ConnectorInterface() {}
virtual ~ConnectorInterface() {}
private:
DISALLOW_COPY_AND_ASSIGN(ConnectorInterface);
};
// The result of GetTransitionCost() is cached with TLS.
// Note that the cache is created as a global variable. If you
// pass two different connectors, the cache variable will be shared.
// Since we can assume that real Connector is a singleton object,
// this restriction will not be a big issue.
class CachedConnector : public ConnectorInterface {
public:
CachedConnector(ConnectorInterface *connector);
~CachedConnector();
virtual int GetTransitionCost(uint16 rid, uint16 lid) const;
virtual int GetResolution() const;
// Clear cache explicitly.
static void ClearCache();
private:
void InitializeCache() const;
ConnectorInterface *connector_;
};
class ConnectorFactory {
public:
// return singleton object
static ConnectorInterface *GetConnector();
// dependency injection for unittesting
static void SetConnector(ConnectorInterface *connector);
};
} // namespace mozc
#endif // MOZC_CONVERTER_CONNECTOR_H_