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#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;
namespace extractor {
class DataArray;
class PhraseLocation;
class SuffixArray {
public:
SuffixArray(shared_ptr<DataArray> data_array);
virtual ~SuffixArray();
virtual int GetSize() const;
virtual shared_ptr<DataArray> GetData() const;
virtual vector<int> BuildLCPArray() const;
virtual 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;
protected:
SuffixArray();
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;
};
} // namespace extractor
#endif
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