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#ifndef MOZC_DICTIONARY_SUPPRESSION_DICTIONARY_H_
#define MOZC_DICTIONARY_SUPPRESSION_DICTIONARY_H_

#include <set>
#include <string>
#include "base/base.h"
#include "base/mutex.h"

namespace mozc {

struct Node;

class SuppressionDictionary {
 public:
  // Lock dictioanry.
  // call Lock() before calling AddWord() or Clear();
  // When the dictionary is locked, Supress() return false.
  //
  // NOTE:
  // Lock() and SupressWord() must be called synchronously.
  void Lock();

  // Unlock dictionary
  void UnLock();

  // return true if the dictionary is locked.
  bool IsLocked() const {
    return locked_;
  }

  // Note that AddWord is not thread safe.
  bool AddEntry(const string &key, const string &value);

  // Note that AddWord is not thread safe.
  void Clear();

  // return true if SuppressionDictionary doesn't have any entries.
  bool IsEmpty() const;

  // Return true if |word| should be suppressed.
  // if the current dictionay is "locked" via Lock() method,
  // this function always return false.
  // Lock() and SuppressWord() must be called synchronously.
  bool SuppressEntry(const string &key, const string &value) const;

  // Suppress node from a linked list of nodes.
  // Return new (modified) linked list.
  Node *SuppressNodes(Node *node) const;

  // Return Singleton object
  static SuppressionDictionary *GetSuppressionDictionary();

  SuppressionDictionary();
  virtual ~SuppressionDictionary();

 private:
  set<string> dic_;
  bool locked_;
  bool has_key_empty_;
  bool has_value_empty_;
  Mutex mutex_;
};
}

#endif  // MOZC_DICTIONARY_SUPPRESSION_DICTIONARY_H_