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// This dictionary supports system dicitonary that will belookup from
// value, rather than key.
// Token's key, cost, ids will not be looked up due to performance concern

#ifndef MOZC_DICTIONARY_SYSTEM_VALUE_DICTIONARY_H_
#define MOZC_DICTIONARY_SYSTEM_VALUE_DICTIONARY_H_

#include <string>

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

namespace mozc {

namespace dictionary {
class SystemDictionaryCodecInterface;
}  // namespace dictionary

namespace rx {
class RxTrie;
}  // namespace rx

class NodeAllocatorInterface;
class DictionaryFile;

class ValueDictionary : public DictionaryInterface {
 public:
  virtual ~ValueDictionary();

  static ValueDictionary *CreateValueDictionaryFromFile(
      const string &filename);

  static ValueDictionary *CreateValueDictionaryFromImage(
      const char *ptr, int len);

  Node *LookupPredictive(const char *str, int size,
                         NodeAllocatorInterface *allocator) const;
  Node *LookupPrefixWithLimit(
      const char *str, int size,
      const Limit &limit,
      NodeAllocatorInterface *allocator) const;
  Node *LookupPrefix(const char *str, int size,
                     NodeAllocatorInterface *allocator) const;
  Node *LookupReverse(const char *str, int size,
                      NodeAllocatorInterface *allocator) const;

 private:
  ValueDictionary();

  bool OpenDictionaryFile();

  scoped_ptr<rx::RxTrie> value_trie_;
  scoped_ptr<DictionaryFile> dictionary_file_;
  const dictionary::SystemDictionaryCodecInterface *codec_;

  DISALLOW_COPY_AND_ASSIGN(ValueDictionary);
};
}  // namespace mozc

#endif  // MOZC_DICTIONARY_SYSTEM_VALUE_DICTIONARY_H_