1 files changed, 51 insertions, 0 deletions
diff --git a/extractor/suffix_array.h b/extractor/suffix_array.h
new file mode 100644
index 00000000..7708f5a2
--- /dev/null
+++ b/extractor/suffix_array.h
@@ -0,0 +1,51 @@
+#ifndef _SUFFIX_ARRAY_H_
+#define _SUFFIX_ARRAY_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <boost/filesystem.hpp>
+
+namespace fs = boost::filesystem;
+using namespace std;
+
+class DataArray;
+class PhraseLocation;
+
+class SuffixArray {
+ public:
+  SuffixArray(shared_ptr<DataArray> data_array);
+
+  virtual ~SuffixArray();
+
+  virtual int GetSize() const;
+
+  shared_ptr<DataArray> GetData() const;
+
+  vector<int> BuildLCPArray() const;
+
+  int GetSuffix(int rank) const;
+
+  virtual PhraseLocation Lookup(int low, int high, const string& word,
+                                int offset) const;
+
+  void WriteBinary(const fs::path& filepath) const;
+
+ private:
+  void BuildSuffixArray();
+
+  void InitialBucketSort(vector<int>& groups);
+
+  void TernaryQuicksort(int left, int right, int step, vector<int>& groups);
+
+  void PrefixDoublingSort(vector<int>& groups);
+
+  int LookupRangeStart(int low, int high, int word_id, int offset) const;
+
+  shared_ptr<DataArray> data_array;
+  vector<int> suffix_array;
+  vector<int> word_start;
+};
+
+#endif