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#ifndef MOZC_CONVERTER_IMMUTABLE_CONVERTER_INTERFACE_H_
#define MOZC_CONVERTER_IMMUTABLE_CONVERTER_INTERFACE_H_

namespace mozc {

class ConversionRequest;
class Segments;

// Perform one-shot conversion with constraints.
// constraits are encoded in |segments|
class ImmutableConverterInterface {
 public:
  virtual ~ImmutableConverterInterface() {}

  // This method is equivalent to:
  //   const ConversionRequest request;
  //   ConvertForRequest(request, segments);
  // TODO(hidehiko): Deprecate this method and use ConvertForRequest.
  virtual bool Convert(Segments *segments) const;

  // This method should be pure-virtual method in theory.
  // However, to keep the backward compatibility untill the deprecation of
  // Conversion method, we provide the default implementation.
  // Please see the .cc file.
  virtual bool ConvertForRequest(
      const ConversionRequest &request, Segments *segments) const;

 protected:
  ImmutableConverterInterface() {}
};

class ImmutableConverterFactory {
 public:
  // return singleton object
  static ImmutableConverterInterface *GetImmutableConverter();

  // dependency injection for unittesting
  static void SetImmutableConverter(ImmutableConverterInterface
                                    *immutable_converter);

 private:
  ImmutableConverterFactory() {}
  ~ImmutableConverterFactory() {}
};
}  // namespace mozc

#endif  // MOZC_CONVERTER_IMMUTABLE_CONVERTER_INTERFACE_H_