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#ifndef MOZC_DICTIONARY_SUFFIX_DICTIONARY_H_
#define MOZC_DICTIONARY_SUFFIX_DICTIONARY_H_

#include "base/port.h"
#include "base/string_piece.h"
#include "dictionary/dictionary_interface.h"

namespace mozc {
namespace dictionary {

struct SuffixToken;

// SuffixDictionary is a special dictionary which handles
// Japanese bunsetsu suffixes.
//
// Japanese bunsetsu consists of two parts.
// Content words: ("自立語") and Functional words ("付属語")
// Japanese Bunsets = (Content word){1,1}(Functional words){1,}
//
// Suffix dictionary contains sequences of functional words
// frequently appear on the web.
// When user inputs a content word, we can predict an appropriate
// functional word with this dictionary.
class SuffixDictionary : public DictionaryInterface {
 public:
  SuffixDictionary(const SuffixToken *suffix_tokens,
                   size_t suffix_tokens_size);
  virtual ~SuffixDictionary();

  virtual bool HasKey(StringPiece key) const;
  virtual bool HasValue(StringPiece value) const;

  // Kana modifier insensitive lookup is not supported.
  virtual void LookupPredictive(
      StringPiece key, bool use_kana_modifier_insensitive_lookup,
      Callback *callback) const;

  // SuffixDictionary doesn't support Prefix/Revese/Exact Lookup.
  virtual void LookupPrefix(
      StringPiece key, bool use_kana_modifier_insensitive_lookup,
      Callback *callback) const;
  virtual void LookupReverse(StringPiece str, Callback *callback) const;
  virtual void LookupExact(StringPiece key, Callback *callback) const;

 private:
  const SuffixToken *const suffix_tokens_;
  const size_t suffix_tokens_size_;

  DISALLOW_COPY_AND_ASSIGN(SuffixDictionary);
};

}  // namespace dictionary
}  // namespace mozc

#endif  // MOZC_DICTIONARY_SUFFIX_DICTIONARY_H_