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#ifndef MOZC_REWRITER_COLLOCATION_REWRITER_H_
#define MOZC_REWRITER_COLLOCATION_REWRITER_H_

#include "base/port.h"
#include "base/scoped_ptr.h"
#include "converter/segments.h"
#include "rewriter/rewriter_interface.h"

namespace mozc {
class ConversionRequest;
class DataManagerInterface;
class POSMatcher;

class CollocationRewriter : public RewriterInterface {
 public:
  explicit CollocationRewriter(const DataManagerInterface *data_manager);
  virtual ~CollocationRewriter();
  virtual bool Rewrite(const ConversionRequest &request,
                       Segments *segments) const;

 private:
  class CollocationFilter;
  class SuppressionFilter;

  bool IsName(const Segment::Candidate &cand) const;
  bool RewriteFromPrevSegment(const Segment::Candidate &prev_cand,
                              Segment *seg) const;
  bool RewriteUsingNextSegment(Segment *next_seg,
                               Segment *seg) const;
  bool RewriteCollocation(Segments *segments) const;

  const POSMatcher *pos_matcher_;
  const uint16 first_name_id_;
  const uint16 last_name_id_;

  // Used to test if pairs of strings are in collocation data. Since it's a
  // bloom filter, non-collocation words are sometimes mistakenly boosted,
  // although the possibility is very low (0.001% by default).
  scoped_ptr<CollocationFilter> collocation_filter_;

  // Used to test if pairs of content key and value are "ateji". Since it's a
  // bloom filter, non-ateji words are sometimes mistakenly classified as ateji,
  // resulting in passing on the right collocations, though the possibility is
  // very low (0.001% by default).
  scoped_ptr<SuppressionFilter> suppression_filter_;
};
}  // namespace mozc

#endif  // MOZC_REWRITER_COLLOCATION_REWRITER_H_